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Congratulations to Bobby1 and his Brazilian Agate Cab!
Another cabochon contest coming soon!
21
on: February 26, 2024, 03:45:45 PM
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Started by R.U. Sirius - Last post by lithicbeads | ||
The colors are from iron just different concentrations and/or reduction states.
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22
on: February 23, 2024, 10:47:27 PM
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Started by R.U. Sirius - Last post by christos | ||
i would consider its green from nickel not iron and reddish from iron
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23
on: February 23, 2024, 10:22:42 PM
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Started by christos - Last post by christos | ||
if you can enlighten me on this property of rock/crystal () |
24
on: February 23, 2024, 10:15:50 PM
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Started by christos - Last post by christos | ||
Does it have a foliation orientation? Any indication of an adaxial or abaxial surface? Looks like the fabric of the rock is very this and that way, like it was stretched and then cracked and filled with quartz secondarily (small vein/dike). Maybe if you could gain some clues from its physical appearance you may be able to uncover some of the processes needed to form it, thus narrowing down potential options for identifying it as one thing or another.it doesnt react to hcl . i can see beryl stratiation. i can see clear glassy veins in the fracture that make wierd crystal faces if you look close to it. plus look how the white vein is cut by green veins in attached photo |
25
on: February 23, 2024, 10:01:11 PM
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Started by christos - Last post by christos | ||
Silicified listwanite, educate yourself.i cant see the carbonate in it plus it doesnt react to HCL. |
26
on: February 23, 2024, 09:36:23 PM
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Started by christos - Last post by christos | ||
27
on: February 23, 2024, 11:54:17 AM
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Started by christos - Last post by lithicbeads | ||
Silicified listwanite, educate yourself.
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28
on: February 23, 2024, 10:34:23 AM
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Started by christos - Last post by WingnutAndAPrayer | ||
As an aside, Christos, I got a really pretty chunk of Aventurine from a landscaping place that was white, teal, darker green, cream and umber orange. It can happen!
Looking up Listwanite I see it is very similar to Aventurine in chemical composition, just some potassium and iron oxide thrown in. Silicified Listwanite is an awesome guess. |
29
on: February 23, 2024, 10:30:58 AM
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Started by christos - Last post by WingnutAndAPrayer | ||
Does it have a foliation orientation? Any indication of an adaxial or abaxial surface? Looks like the fabric of the rock is very this and that way, like it was stretched and then cracked and filled with quartz secondarily (small vein/dike). Maybe if you could gain some clues from its physical appearance you may be able to uncover some of the processes needed to form it, thus narrowing down potential options for identifying it as one thing or another.
If you whack two quartzes together hard enough they will spark. Just sayin'. |
30
on: February 23, 2024, 10:23:50 AM
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Started by WingnutAndAPrayer - Last post by WingnutAndAPrayer | ||
Thanks for the knowledge! It feels and looks very similar structurally to the diagenetic meta-cherts I find in NW Montana that precipitated from bacterial mats. Low grade Opal-CT? Or just half-baked? Y'all I've finally made the transition to an interest in silicates beyond the world of agates and that rabbit hole goes deeeep.
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