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what is this 'mineral'?
Posted by: My Boy Boris
Date: March 25, 2017 07:38PM
i have a bunch of it but don't know what it is. thanks




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Re: what is this 'mineral'?
Posted by: Larry (IL)
Date: March 25, 2017 08:20PM
It looks like pink agate (Quartz) to me.

From Google:

Quartz is a very common mineral in the Earth’s crust. Chemically, quartz is silica, or silicon dioxide, SiO2. It is found in most types of rocks: igneous, metamorphic and sedimentary. Quartz is rather hard, 7 on the Moh’s hardness scale, and has a glassy (vitreous) luster.



Bells and whistles are nice, but nothing will substitute for the basic understanding of the hobby.

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Re: what is this 'mineral'?
Posted by: Mineral Master
Date: March 25, 2017 08:40PM
It's an agate, and it looks like you have quite a specimen there.



Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same, or one day we will spend our sunset years telling our children and our children's children what it was once like in the United States where men were free. –Ronald Reagan

Re: what is this 'mineral'?
Posted by: My Boy Boris
Date: March 25, 2017 08:42PM
thanks. just came across it online. couldn't find it for the life of e but right after i post i find pics. it's called rhodochrosite.

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Re: what is this 'mineral'?
Posted by: Mineral Master
Date: March 25, 2017 08:59PM
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Re: what is this 'mineral'?
Posted by: Champ Ferguson
Date: March 26, 2017 12:12PM
Quote
Mineral Master
It's an agate, and it looks like you have quite a specimen there.



Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same, or one day we will spend our sunset years telling our children and our children's children what it was once like in the United States where men were free. –Ronald Reagan


Absent any basic testing, I agree. And its a very pretty specimen.



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Re: what is this 'mineral'?
Posted by: Dave J.
Date: March 27, 2017 12:26AM
It's a rhodochrosite speleothem.

https://en.wikipedia.org/wiki/Speleothem
http://geology.com/minerals/rhodochrosite.shtml



Edited 2 time(s). Last edit at 03/27/2017 12:40AM by Dave J..

Re: what is this 'mineral'?
Posted by: Johnho
Date: March 31, 2017 10:56AM
Looks like rhodochrosite to me too. See if a knife will scratch it, in a very out of sight spot. Rhodochrosite should scratch. Quarts or agate won't.

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