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Location: Jade
Discussion: Botryoidals
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aubreyreynolds9@gmai |
20. RE: Botryoidals
Sep 27 2009, 1:42 PM EDT
| Post edited: Sep 27 2009, 2:50 PM EDT
"HI Bill, great info in this thread! At Rock Candy, both fluorite and quartz occur in botryoidal habit. The hemispherical quartz always starts as sub-parallel needles, which under magnification look like a pin cushion. The prism faces are elongated to an amazing aspect ratio, 50:1 or more, so in hand specimen the crystals appear fibrous. Individual hemispheres occur to 2 inches across. Conditions can range from the high T limit of green schist amphibolite facies (< 550 °C) in the dolomite-derived type to moderate (~400 °C for Fengtian nephrite, Taiwan; Yui et al., 1988) to very low temperatures (~100 °C) in ophiolites; all occur at moderate to low pressure (<2kbar?). Supersaturation of interacting fluids or fluids and solids at low T appears to yield the fibrous-mat crystallizations characteristic of nephrite; alternatively some authors attribute the nephrite texture to recrystallization of metasomatic amphibole by subsequent shear deformation (e.g., Cooper, 1995) or replacement of antigorite (e.g., O’Hanley, 1996). The temperature quoated in one Article for NW Nephrite was 250F which is near atmospheric. Bill 2 out of 2 found this valuable. Do you? |
gamaliel114 |
21. RE: Botryoidals
Sep 28 2009, 1:39 AM EDT
"Zeke have you found any more Botryoidal jade?I have dozens, but most are still trap inside the serpentinite. It is apparently a real art getting it off without damaging the surface of the "grapes". I just got my new camera yesterday while I was out on Vesper, but I'll post some of my newest....Greywacke? Really? I'll need to re-check the maps. Must be the "country rock" I have never been able to identify...but on Grandy Creek I really took it to be the chert. I'll be looking out for both then. but really it sounds like all i have to look for are the Rodingites. thanks for interpreting all the scientific papers...there's a point where they lose me :-) The guy at Happy Camp (California) is going to love this information. We've been comparing notes and though we seem to be in very similar geologic conditions, there are obvious differences between the variety of botryoidals we find. The variety in California seems relatively rare here...I have some, but not as many as I'd like. I guess that's why I asked the question. ~Zeke Do you find this valuable? |
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gamaliel114 |
22. RE: Botryoidals
Oct 1 2009, 8:01 PM EDT
Playing around with my new camera. Here are two slideshows of botryoidals. The first is a rare red (rind?) botryoidal from Pilchuck Creek, very weathered. http://s790.photobucket.com/albums/yy184/jadadara/PILCHUCKCREEK/Summer09/RedBotMountain/?albumview=slideshow The second is a white botryoidal from Bear Creek. I found it about a half mile up the creek after having no luck. I gave up and said let's just stop here to my son. I sat down and there it was! http://s790.photobucket.com/albums/yy184/jadadara/BEARCREEK/BearOrBust/BrainStemBot/?albumview=slideshow ~Zeke Do you find this valuable? |
rockcandyguy |
23. RE: Botryoidals
Oct 1 2009, 8:20 PM EDT
| Post edited: Oct 1 2009, 8:21 PM EDT
"I have dozens, but most are still trap inside the serpentinite. It is apparently a real art getting it off without damaging the surface of the "grapes". I just got my new camera yesterday while I was out on Vesper, but I'll post some of my newest....Greywacke? Really? I'll need to re-check the maps. Must be the "country rock" I have never been able to identify...but on Grandy Creek I really took it to be the chert. I'll be looking out for both then. but really it sounds like all i have to look for are the Rodingites. thanks for interpreting all the scientific papers...there's a point where they lose me :-) The guy at Happy Camp (California) is going to love this information. We've been comparing notes and though we seem to be in very similar geologic conditions, there are obvious differences between the variety of botryoidals we find. The variety in California seems relatively rare here...I have some, but not as many as I'd like. I guess that's why I asked the question.Hey, Zeke, the amount of 'art' depends on the tools you have. Glass bead blasting blows away the serpentinite, but leaves the jade unscathed. The Skagit County greywacke has largely been silicified, making it resemble chert more than a sed. Nice photos ... the red rind piece is super. And congratulations on surviving the hike to Vesper! Bob Do you find this valuable? |
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gamaliel114 |
24. RE: Botryoidals
Oct 1 2009, 8:34 PM EDT
Thanks. I have been looking into how to remove the serpentinite safely. some pieces don't need it, but most would benefit. Your explanation of the graywacke matches with what I've seen then. Is there another name they would call it on the generalized maps? I use Grandy creek as my theory testing site as the source is relatively close, but I can't seem to find greywacke on the maps. I also couldn't find "rodingite" even though the creek is lousy with it. I finally figured they used the term "metagabbro".~Zeke Do you find this valuable? |
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rockcandyguy |
25. RE: Botryoidals
Oct 1 2009, 8:44 PM EDT
"Thanks. I have been looking into how to remove the serpentinite safely. some pieces don't need it, but most would benefit. Your explanation of the graywacke matches with what I've seen then. Is there another name they would call it on the generalized maps? I use Grandy creek as my theory testing site as the source is relatively close, but I can't seem to find greywacke on the maps. I also couldn't find "rodingite" even though the creek is lousy with it. I finally figured they used the term "metagabbro".Its funny, Zeke, tho I've read a lot of geologic maps, I'd never heard the term 'rodingite' until I saw it on the wiki & looked it up. Not in wide useage. Once the metamorphosis is strong enfu, meta-gabbro or generalized 'meta-seds' could describe the same stuff. Looks like chert to me, nice conchoidal fracture and green color. Stepped over quite a bit of the same stuff while wading across the Middle Fork this summer ... all glacial origin down this way. Bob Do you find this valuable? |
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gamaliel114 |
26. RE: Botryoidals
Oct 1 2009, 8:54 PM EDT
Yeah, I've only seen it used once on a map (Deer Creek Oso area). But I've seen the term Calc-silicate more often. I use rodingte as a catch all term for the metasomatic rocks associated with serpentinzation. I don't know that the chert-like stuff would qualify or not. I don't think anyone really has a good definition of the series of stuff. They seem to reserve rodingite to the stuff that is high in hydrogrossular garnet content.~Zeke Do you find this valuable? |
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aubreyreynolds9@gmai |
27. RE: Botryoidals
Oct 1 2009, 11:06 PM EDT
I posted a couple of pictures of fine carved graywacke statues. Do not ask me if they are in my collection, they are priceless antiquities. Tell NamVet 58 it is Silicon Dioxide. Silicon is an element. The chemical compound silicon dioxide, also known as silica (from the Latin silex), is an oxide of silicon with a chemical formula of SiO2. Bill 2 out of 2 found this valuable. Do you? |
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gamaliel114 |
28. RE: Botryoidals
Oct 1 2009, 11:25 PM EDT
LOL!, will do. it's not that you are old, it's that you are an engineer. He's already been corrected.Thanks for the pictures, I think I recognize what the greywacke on Grandy is now. I'll take pictures when i go out next week. ~zeke Do you find this valuable? |
retiredoldfogee |
29. RE: Botryoidals
Oct 2 2009, 12:00 AM EDT
"Thanks. I have been looking into how to remove the serpentinite safely. some pieces don't need it, but most would benefit. Your explanation of the graywacke matches with what I've seen then. Is there another name they would call it on the generalized maps? I use Grandy creek as my theory testing site as the source is relatively close, but I can't seem to find greywacke on the maps. I also couldn't find "rodingite" even though the creek is lousy with it. I finally figured they used the term "metagabbro".How to remove the Serpentine rind... I read something from a botryodial Jade guy in California the way he cleans his botryodials is he soaks them in olive oil and lemon juice for several days. That is supposed to soften both the white rind and the serpentine, then he uses a dental pick (a metal one to scratch out the serpentine. Hard enough to scratch away the softened serpentine but not to damage the Jade. Thanks, Aaron Do you find this valuable? |
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gamaliel114 |
30. RE: Botryoidals
Oct 2 2009, 12:04 AM EDT
I've heard of similar methods too.~Zeke Do you find this valuable? |
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rockcandyguy |
31. RE: Botryoidals
Oct 2 2009, 12:08 AM EDT
| Post edited: Oct 2 2009, 12:16 AM EDT
And the excess makes an excellent salad dressing... to say nothing of an excellent source of fiber.
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retiredoldfogee |
32. RE: Botryoidals
Oct 2 2009, 12:13 AM EDT
"And the excess makes an excellent salad dressing..."LOL, oh man I want to hurl thinking about that brown serpentine scum as food. The downside to the method of lemon juice is lemons are all over the place in California, and can be found pretty much for free, but up here in Washington they aren't as cheap.doing alot of those could get expensive. Do you find this valuable? |
jakesrocks |
33. RE: Botryoidals
Oct 2 2009, 12:21 AM EDT
They can be found for free in California, if you don't mind the occasional load of buckshot in the backside. Those orchard owners are very protective of their crops.Don Do you find this valuable? |
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retiredoldfogee |
34. RE: Botryoidals
Oct 2 2009, 12:24 AM EDT
"They can be found for free in California, if you don't mind the occasional load of buckshot in the backside. Those orchard owners are very protective of their crops.Well I was thinking of my family in SoCal and they all had Lemon trees that just dropped lemons they never ate that grow year round. Mostly they said weren't good enough quality to eat. So my point is there is an abundance of those. Not to go into orchards and steal fruit, when you could just pick up lemons in your back yard or offer to cleanup your neighbors rotten lemons... Do you find this valuable? |
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aubreyreynolds9@gmai |
35. RE: Botryoidals
Oct 2 2009, 8:16 AM EDT
| Post edited: Oct 2 2009, 8:17 AM EDT
Silicon is one unusual element. It is the most common metalloid. On Earth, silicon is the second most abundant element (after oxygen) in the crust, making up 25.7% of the crust by mass. Silicon has many industrial uses. It is the principal component of most semiconductor devices, most importantly integrated circuits or microchips. A semi conductor can conduct electricity in only one direction thus it can act as a transistor. Some scientist have said that if we contact intelligence from another world it will not be a biological being but a highly intelligent machine, The possibility of computers becoming more intelligent than a human brain is a real possibility. There are many forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, lechatelierite, chalcedony, and glass which is not a mineral. High quality quartz crystals are single-crystal silica with optical or electronic properties that make them useful for specialty purposes. USGS estimates that about ten billion quartz crystals are used every year. Electronics grade crystals can be used in filters, frequency controls, timers, electronic circuits that become important components in cell phones, watches, clocks, games, television receivers, computers, navigational instruments and other products. Optical-grade crystals can be used as lenses and windows in lasers and other specialized devices. Although some natural quartz crystals are used in these applications, most of these special crystals are now manufactured1 out of 1 found this valuable. Do you? |
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aubreyreynolds9@gmai |
36. RE: Botryoidals
Oct 2 2009, 8:34 AM EDT
| Post edited: Oct 2 2009, 8:35 AM EDT
Quartz possesses piezoelectricity.()see Rockhounding for Dummies) Discovered by the French physicist and chemist Pierre Curie (1859–1906), the piezoelectric effect is a phenomenon demonstrated by certain crystals: when squeezed or stretched, a voltage is produced across the crystal's face. This effect is reversible as well, for when a voltage is applied to a piezoelectric crystal it will stretch; if the polarity of the voltage is alternated, the crystal will rapidly expand and contract, producing a vibration. It is this vibration that makes quartz especially useful. Every kind of piezoelectric crystal has a natural vibration frequency that is determined by its thickness—the thinner the crystal, the higher the frequency. When a crystal is made to vibrate at its natural frequency by the application of a voltage, the system is said to be in resonance. A crystal in resonance will maintain a constant, unfaltering frequency. When coupled with vacuum tubes or transistors, this constant frequency can be changed into a radio signal. Such was the design of the quartz radio, used primarily during World War II. Another common use of quartz is in timekeeping. All clocks rely upon some form of oscillator to keep regular time; for example, mechanical clocks sometimes use a pendulum to regulate the motion of their hands. In a quartz timepiece, a small ring-shaped piece of crystal is made to vibrate at its natural frequency. A microchip reads how many times the quartz vibrates each second and uses that information to keep accurate time. Because the crystal's vibration is unfaltering, quartz clocks are among the most precise timekeeping devices, losing less than one hundred thousandth of a second each day. Quartz crystals can be used to regulate both digital and analog clocks and watches.
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aubreyreynolds9@gmai |
37. RE: Botryoidals
Oct 2 2009, 7:03 PM EDT
My dad made a crystal radio when he was a boy. He ran a wire to a tall tree as an antenna . Sure enough a passing thunderstorm shot a bolt to the wire. The radio was setting on the family piano. The lighting destroyed not only the radio but also piano.Bill Do you find this valuable? |
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jakesrocks |
38. RE: Botryoidals
Oct 2 2009, 8:02 PM EDT
"My dad made a crystal radio when he was a boy. He ran a wire to a tall tree as an antenna . Sure enough a passing thunderstorm shot a bolt to the wire. The radio was setting on the family piano. The lighting destroyed not only the radio but also piano.You're just trying to make me feel old. I made a couple of those radios when I was in the Cub Scouts. Don Do you find this valuable? |
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aubreyreynolds9@gmai |
39. RE: Botryoidals
Oct 2 2009, 8:03 PM EDT
Nephrite ranges from pure, white tremolite (“mutton-fat jade”) to dark green actinolite and occasionally black from Fe-actinolite or oxide / graphite pigment. Rarely nephrite can have an emerald-green color from Cr3+ in sodic-tremolite/actinolite. Staining to ochre colors from iron oxidation in weathering rinds of boulders is common. Minor coexisting minerals include diopside, calcic garnet, magnetite, chromite, graphite, apatite, rutile, pyrite, datolite, vesuvianite, prehnite, talc, serpentine polymorphs and titanite. Nephrite bodies result from contact and/or infiltration metasomatism of either dolomite by magmatic fluids or silicic rocks by serpentinite fluids. White nephrite is derived from siliceous metasomatism of dolomite by a “granitic” body or its pneumatolytic / hydrothermal apophyses . However,dolomite metasomatism can yield green to black jade if a source of iron is present, such as from mafic bodies,iron-stone . Other nephrites involve either metasomatism of silicicrocks in serpentinite (or serpentinite melange) by Ca-Mg-rich fluids or a boundary reaction/infiltration metasomatism of silicic rocks or fluids from them acting upon antigorite serpentinite and serpentinite fluids both being post-igneous processes (the serpentinite affinity places such nephrite deposits among the global distribution of ophiolite complexes, the scars of ocean basins closed by plate tectonics – Fig. . Ca saturation is most likely produced by clinopyroxene breakdown during maximum serpentinization, however, in part, it may also be the result of decreasing P and increasing T upon fluids rising through (and with) serpentinite melange.
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