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Offlinethe_hatter
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Registered: 04/18/10
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Mineral Id help
    #19281631 - 12/15/13 10:31 PM (10 years, 1 month ago)

Found this while camped out in northern Cali this summer.  it seriously sparkles like a diamond, not suggesting it is one but ive never seen a natural stone this shiny.  Anyone know what it is?

N


Edited by the_hatter (12/16/13 01:13 PM)


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Offliner00tuuu123
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Re: Mineral Id help [Re: the_hatter]
    #19283816 - 12/16/13 01:04 PM (10 years, 1 month ago)

Er kinda looks like Quartz to me.


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Offlinethe_hatter
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Re: Mineral Id help [Re: r00tuuu123]
    #19283845 - 12/16/13 01:10 PM (10 years, 1 month ago)

that was my initial thought but the cylindrical form really throws me for a loop.  plus its uncommonly clear and lustrous.  it could very well be quartz but we definitely don't get it like this where im from.


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Invisiblepassifloracaerulea
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Re: Mineral Id help [Re: the_hatter]
    #19285871 - 12/16/13 08:34 PM (10 years, 1 month ago)

it's euhedral quartz with a geode habit. the cylindrical shape is likely due to it being a limb cast. I have hundreds of similar ones dug in central Oregon. there was a stick that got covered in ash or basalt, burnt, rotted, and left a cast for silica to precipitate into, forming agate and quartz.


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Invisiblepassifloracaerulea
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Re: Mineral Id help [Re: passifloracaerulea]
    #19285885 - 12/16/13 08:37 PM (10 years, 1 month ago)

if you live in a limestone bearing state(Midwest or southern states), it could be a crinoid replaced with silica. I've found similar ones in western Kentucky filled with crystals.


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Offliner00tuuu123
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Re: Mineral Id help [Re: the_hatter]
    #19286030 - 12/16/13 09:17 PM (10 years, 1 month ago)

Quote:

the_hatter said:
that was my initial thought but the cylindrical form really throws me for a loop.  plus its uncommonly clear and lustrous.  it could very well be quartz but we definitely don't get it like this where im from.



Too bad the pics are not bigger but I would say 99% that is quartz. Quartz comes in many colors From black to clear.


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Offlinethe_hatter
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Re: Mineral Id help [Re: passifloracaerulea]
    #19288153 - 12/17/13 11:36 AM (10 years, 1 month ago)

Quote:

passifloracaerulea said:
it's euhedral quartz with a geode habit. the cylindrical shape is likely due to it being a limb cast. I have hundreds of similar ones dug in central Oregon. there was a stick that got covered in ash or basalt, burnt, rotted, and left a cast for silica to precipitate into, forming agate and quartz.



this sounds right to me, thanks for the help.


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Offlinerev0kadavur
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Registered: 03/18/10
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Re: Mineral Id help [Re: the_hatter]
    #19293996 - 12/18/13 04:13 PM (10 years, 1 month ago)

wow, that's a really cool one!

sure doesn't look like any quartz I have found, but quartz is a likely suspect.

Been getting into mineral ID... realized its much more complicated than I thought it would be... need to set myself up with a mini field testing kit.


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Invisiblepassifloracaerulea
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Re: Mineral Id help [Re: rev0kadavur]
    #19294320 - 12/18/13 05:30 PM (10 years, 1 month ago)

the best way to get into mineral id is at the gem shows bearing some basic id skills. they are the only places you'll see gems and minerals from all over the world, and from sources and mines that never make it into the mainstream market.


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