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1,687 questions

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6,459 users

What type of rock or mineral is this?

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alt text

asked Feb 1, 2014 by stewartmgangwer (160 points)

6 Answers

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As a member of arrowheads.com a fellow member thought this to be red jasper and gave a suggestion of google it to look at similarities. I did perform hardness test usu g first a penny and then a pocket knife. The results were the knife and penny were scratched making it at least 5.5 in hardness.

answered Feb 2, 2014 by stewartmgangwer (160 points)
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Yes, definitely looks like red jasper. See if you can get a hold of a piece of quartz to see if you are able to scratch it.

answered Feb 3, 2014 by hershel (46,460 points)
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Jasper is a cryptocrystalline variety of quartz and it's hardness is slightly less than crystalline quartz. If you have a piece of the latter it should scratch it. The varigated pattern of solid red and areas of tan quartz crystals druse is typical of jaspers (opaque) and agates (translucent). I'm glad you did some basic hardness tests!

answered Feb 12, 2014 by stonesinger (720 points)
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I think it might be a purpurite

answered Feb 25, 2014 by gdf1234 (340 points)
0 votes

There is no way this is purpurite. That mineral is found in pegmatites as a secondary alteration mineral (see mindat.org for further information) and would never survive transport and rounding into a cobble. It's hardness (4-41/2) and color are entirely different. I have some of this in my collection and it is very different from the pictured piece. I still stand by my original id of jasper.

answered Feb 25, 2014 by stonesinger (720 points)
0 votes

Agreed - this definitely is not purpurite, and I also stand by the most likely candidate as jasper.

answered Feb 26, 2014 by hershel (46,460 points)

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