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Author Topic: Rock identification  (Read 6231 times)

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Offline Mar-Kea

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Rock identification
« on: June 30, 2014, 10:05:58 PM »
Anyone know what this is?  It's dark green, looks waxy, and the white looking shiny part is little crystals all over it.

Mar-Kea [ Invalid Attachment ]

Offline sunshine

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Re: Rock identification
« Reply #1 on: July 01, 2014, 08:15:44 AM »
I would guess Serpentine.  It would have a hardness of 3-4.5 and streaks white.  It can be associated with fibrous/flexible asbestos, so be careful as that is cancer causing and should then be stored in a closed container or bag. 
See my YouTube channel for fun amateur video:
https://www.youtube.com/channel/UCnz8kX6AZOeZbRt0F9XqVJA

Offline Mar-Kea

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Re: Rock identification
« Reply #2 on: July 01, 2014, 01:40:57 PM »
No, it streaks green.

Offline aumbre

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Re: Rock identification
« Reply #3 on: July 01, 2014, 03:47:47 PM »
Soapstone? EMF will probably recognize that type of rock. Did it come from the Klamath Mts.?

Offline Mar-Kea

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Re: Rock identification
« Reply #4 on: July 02, 2014, 01:37:19 AM »
Not sure where its from. A friend gave it to me.

Offline EMF

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Re: Rock identification
« Reply #5 on: July 04, 2014, 06:58:37 PM »
That one is more difficult to identify by picture alone than most. Can it be scratched with a knife? Is it harder or softer than quartz? The feature that makes it challenging is that it appears to have a weakly chonchoidal fracture. It could be be just the way the photo presents it too. From the photo there appear to be several minerals together in that piece, but if you answer the questions we can probably figure it out.

Offline Mar-Kea

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Re: Rock identification
« Reply #6 on: July 04, 2014, 07:49:14 PM »
Knife leaves a white streak on the rock. Dropped on another rock and hit with rock pick. Didn't break. Fractures were already there.

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Offline Mar-Kea

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Re: Rock identification
« Reply #7 on: July 04, 2014, 07:51:23 PM »
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Offline EMF

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Re: Rock identification
« Reply #8 on: July 05, 2014, 10:49:19 AM »
Looking at the new pictures and knowing that a knife can scratch it tells me you have a rock known as serpentinite.  It is a metamorphic rock composed of minerals in the serpentine family, things like antigorite, harzburgite, chrysotile, lizardite, etc. Antigorite is one that is easily mistaken for jade, but a knife will scratch the antigorite and not the jade. Take care not fragment it in closed spaces, because there is the small chance of liberating asbestos particles (the chrysotile) into the air you breathe.  There is likely to be a lot of magnetite in that rock, and if so a rare earth magnet will be drawn to it. If you look closely you may even spot some chromite in it.

Offline Mar-Kea

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Re: Rock identification
« Reply #9 on: July 07, 2014, 01:30:59 PM »
Thanks. I spent yesterday finding the place she found it. It's in south east oregon. It's found with petrified wood. Some of the rocks are a mint green.

It is not magnetic. Some other people were there looking for some they said it was jasper. Now I'm really confused. Lol