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Please ID this light green rock
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Betty




Joined: 28 Jul 2017
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PostPosted: Jul 28, 2017 14:45    Post subject: Please ID this light green rock  

Hello! I was given this rock but do not know what it is. Pale green. A pin does not scratch it, but a quartz can - just barely. Specific gravity 2.64. Thank you for your help.


mystery1-a.jpg
 Mineral: unknown
 Dimensions: 6cm x 7.5cm x 9cm
 Description:
A pin does not scratch it, but a quartz can - just barely. Specific gravity 2.64
 Viewed:  589 Time(s)

mystery1-a.jpg



mystery1-b.jpg
 Mineral: unknown
 Dimensions: 6cm x 7.5cm x 9cm
 Description:
A pin does not scratch it, but a quartz can - just barely. Specific gravity 2.64
 Viewed:  590 Time(s)

mystery1-b.jpg



mystery1-c.jpg
 Mineral: unknown
 Description:
A pin does not scratch it, but a quartz can - just barely. Specific gravity 2.64
 Viewed:  589 Time(s)

mystery1-c.jpg


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kushmeja




Joined: 28 Jul 2014
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Location: New Jersey

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PostPosted: Jul 28, 2017 14:57    Post subject: Re: Please ID this light green rock  

It looks like Microcline var. amazonite, and the specific gravity and hardness tests you did do confirm that, so I'd say that's probably what it is.
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lluis




Joined: 17 Nov 2006
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PostPosted: Jul 29, 2017 09:37    Post subject: Re: Please ID this light green rock  

I think just as Kushmeja, if that serves...

With best wishes

Lluís
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Volkmar Stingl




Joined: 23 Sep 2012
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PostPosted: Jul 29, 2017 13:54    Post subject: Re: Please ID this light green rock  

Sorry, I see a green chlorite-bearing layered quartzite.
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lluis




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PostPosted: Jul 29, 2017 14:29    Post subject: Re: Please ID this light green rock  

Maybe

A hardness test will help us a lot (besides, I do not think in a chlorite coated quartzite; say me odd...)

With best wishes

Lluís
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Dale Hallmark




Joined: 16 Jun 2014
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Location: Texas Panhandle


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PostPosted: Jul 29, 2017 14:47    Post subject: Re: Please ID this light green rock  

I have a much larger piece that looks very similar that was sold as amazonite. I have always thought it actually a quartzite. I was never curious enough to do much testing. It is part of a group of samples I use in a water quality class for fourth graders once a year...doesn't really matter what it is, they think it looks cool and that was what I bought it for.

Dale
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lluis




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PostPosted: Jul 30, 2017 10:36    Post subject: Re: Please ID this light green rock  

Hi, Dale

It is easy...
Just do a hardness test

https://www.mindat.org/min-3337.html
https://www.mindat.org/min-2704.html

Quartz is harder that microcline (amazonite)...

With best wishes

Lluís
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Betty




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PostPosted: Aug 05, 2017 18:52    Post subject: Re: Please ID this light green rock  

Thanks for the help!
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