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Post by liveoak on Nov 20, 2022 10:45:08 GMT -5
VERY sparklie, more so than the photo shows.
Mohs hardness on my basic test 6-7
Any idea ? - It's pretty
Thanks,
Patty
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Post by rockjunquie on Nov 20, 2022 12:02:42 GMT -5
VERY sparklie, more so than the photo shows.
Mohs hardness on my basic test 6-7
Any idea ? - It's pretty
Thanks,
Patty Where is it from? Could be fuchsite and something else.
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Post by vegasjames on Nov 20, 2022 12:37:13 GMT -5
Possibly green biotite mica in quartz.
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Post by liveoak on Nov 20, 2022 12:39:21 GMT -5
From a box of rocks I purchased in the RTH classified from bstone
Looks like that Tela rockjunquie , but my quartz crystal (7) scratched it, but 6 didn't Google says fuchsite is 2-3 I also looked up Mariposite, but also has a low hardness.
?
I was thinking to use it in a Christmas present - so was hoping to put a name on it besides Sparkle Patty
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rockbrain
Cave Dweller
Member since January 2022
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Post by rockbrain on Nov 20, 2022 12:54:54 GMT -5
liveoak Patty, that doesn't quite look like Mariposite and it's usually classified as soft but the hardness can be all over the place.
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Post by fernwood on Nov 20, 2022 13:01:15 GMT -5
Could it be Aventurine? Very pretty.
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Post by vegasjames on Nov 20, 2022 13:29:36 GMT -5
The green could also be chlorite. Did you try to test the hardness of the green separate from the white?
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Post by liveoak on Nov 20, 2022 13:34:27 GMT -5
It seems too granular for Aventurine.
But the mica inclusions are definitely there big time.
The green biotite mica in quartz looks like it forms in crystals ?
I think I need to go see if I have any more the rock left from slabbing, maybe that will help.
Stay Tuned,
Thanks,
Patty
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Post by liveoak on Nov 20, 2022 13:36:18 GMT -5
The green could also be chlorite. Did you try to test the hardness of the green separate from the white? Not sure it would be possible to test the green from the white - it's all one rock, kind of mixed together.
Patty
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Post by liveoak on Nov 20, 2022 13:55:07 GMT -5
Rock Photos -
Note in the small white areas I see a ghost of a pink color .
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Post by vegasjames on Nov 20, 2022 14:38:02 GMT -5
It seems too granular for Aventurine.
But the mica inclusions are definitely there big time.
The green biotite mica in quartz looks like it forms in crystals ?
I think I need to go see if I have any more the rock left from slabbing, maybe that will help.
Stay Tuned,
Thanks,
Patty
Green biotite is relatively common in areas around here and it never forms in crystals. It forms in round flat plates of green mica. I will have to try and find one of my pieces and photograph it.
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Post by liveoak on Nov 21, 2022 11:07:56 GMT -5
What a difference a polished cab makes-
After I cut & ground it and thought it was softer than the turritella I cut after it. I had Tom re-check the hardness- he said he thought between 3-4 .
Anyway any other ideas ?
Polishing it made it so much darker & lower in sparkle that I wouldn't have thought it was the same stone. Thanks,
Patty
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Post by liveoak on Nov 21, 2022 12:04:30 GMT -5
Phyllite. Slate that’s been subject to low grade metamorphosis, minerals present are mainly quartz, mica, and chlorite. Higher grade metamorphic rocks from the same parent rock would be schist and gneiss. Slate - phyllite - schist - gneiss would be the progression of metamorphic activity. Interesting,as google says that Phyllite can get it's color (green) from the chlorite, which is what vegasjames suggested yesterday. My only problem with both is that they say 2-3 hardness. However as James suggested yesterday the white mica /quartz could be influencing my primitive hardness test.
So Phyllite / Chlorite I guess we'll call it
Thanks for everyone's input.
I did learn one important thing for the future, if at all possible for easier ID you need to show the rough rock & the polished rock, as they can look VERY different.
Patty
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Post by vegasjames on Nov 21, 2022 19:10:04 GMT -5
Phyllite. Slate that’s been subject to low grade metamorphosis, minerals present are mainly quartz, mica, and chlorite. Higher grade metamorphic rocks from the same parent rock would be schist and gneiss. Slate - phyllite - schist - gneiss would be the progression of metamorphic activity. Interesting,as google says that Phyllite can get it's color (green) from the chlorite, which is what vegasjames suggested yesterday. My only problem with both is that they say 2-3 hardness. However as James suggested yesterday the white mica /quartz could be influencing my primitive hardness test.
So Phyllite / Chlorite I guess we'll call it
Thanks for everyone's input.
I did learn one important thing for the future, if at all possible for easier ID you need to show the rough rock & the polished rock, as they can look VERY different.
Patty
Yes, phyllite comes in several colors. Silver is the most common, but I have also found it in gold, and in green. Phyllite is composed of very fine flakes of mica an is the precursor to schist, which has a coarser grain.
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Post by liveoak on Nov 21, 2022 19:57:11 GMT -5
I can see the grain more like schist, and the color of Chlorite ? But I did find it interesting the difference in general appearance in rough vs polished.
It was funny, my husband came in at the end of the day & I showed him the cab & he said, what stone is that ? When I told him it was the same green sparkly he didn't believe me at first.
Learn something new everyday. My brain says that polished it would still resemble the rough in one way ? Guess not always.
Thanks for your input, Patty
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Post by mohs on Nov 21, 2022 20:53:17 GMT -5
really enjoy this discussion especially about the gleaming mineral The Salt River isn't fabulous for lapidary material butte the amount of gleam keeps me looking saw this large chunk of today of what I believe to be schist I'm coming to the conclusion trying to capture the gleam on digital still is beyond me mostly
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Post by vegasjames on Nov 22, 2022 5:31:27 GMT -5
I can see the grain more like schist, and the color of Chlorite ? But I did find it interesting the difference in general appearance in rough vs polished. It was funny, my husband came in at the end of the day & I showed him the cab & he said, what stone is that ? When I told him it was the same green sparkly he didn't believe me at first. Learn something new everyday. My brain says that polished it would still resemble the rough in one way ? Guess not always. Thanks for your input, Patty I have cabbed phyllite before Starting out is was pretty shiny, silvery. Cabbing it made it a little darker.
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Post by liveoak on Nov 22, 2022 6:57:21 GMT -5
I think I'm sticking with Chlorite, vegasjames It's green and polished very dark green. Thanks for the photo. Patty
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Post by vegasjames on Nov 22, 2022 7:22:56 GMT -5
I think I'm sticking with Chlorite, vegasjames It's green and polished very dark green. Thanks for the photo. Patty Chlorite itself is not a specific mineral. The name is used as an ID for abotu 10 different minerals in that family.
Chlorite is also a component of phyllite.
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Post by liveoak on Nov 22, 2022 12:12:51 GMT -5
I think I'm sticking with Chlorite, vegasjames It's green and polished very dark green. Thanks for the photo. Patty Chlorite itself is not a specific mineral. The name is used as an ID for abotu 10 different minerals in that family.
Chlorite is also a component of phyllite.
Sorry for my confusion -
So if you were to call this stone Phyllite would/could that be more accurate ?
Patty
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