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Post by ladybeabea on Aug 11, 2007 11:55:10 GMT -5
"Found" these in a salted bucket in May and still cannot ID them. They are much harder than calcite; won't take a scratch from a steel blade. They have distinct rectangular crystal protrusions/inclusions throughout the stones, similar to what I have seen on beryls. Your help is appreciated. Lady B   |
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Post by jimolson on Aug 11, 2007 13:44:17 GMT -5
looks like calcite - just a guess
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Post by dr00bie on Aug 13, 2007 9:38:35 GMT -5
I agree with Jim, they look like calcite...
Drop a few drops of diluted hydrochloric acid on it to see if it fizzes...
Drew
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Post by bammer on Aug 13, 2007 11:37:14 GMT -5
Carnelian is my guess. We have gotten some of it in our gem buckets also.
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Post by CKB69 on Aug 13, 2007 19:51:35 GMT -5
Hard to say without better pics , or , direct examination . I kinda' doubt calcite , as I do not see any telltale rhombic cleavage . It could very possibly be carnelian , as there is what appears to be a common center where some of the crystal faces originate from , often seen in agates/chalcedony varieties . Then again , I could be wrong.  |
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Post by colorshapetexture on Aug 13, 2007 20:40:30 GMT -5
i wanted to say calcedony, but the crystal look in the middle had me.
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Post by DigDug on Aug 14, 2007 0:25:44 GMT -5
Isnt Carnelian a Chalcedony, you are right Jim
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fayncfaceter
Senior Member
Portuguese cut in synthetic Citrine
Posts: 92
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Post by fayncfaceter on Mar 27, 2008 18:15:15 GMT -5
Looks like a garden variety Calcite. When I was in college on a field trip I collected many different varieties of calcite. I have several samples of the orange variety.
Carnelian is a quartz species and doesn't have a crystal structure. I can plainly see a crystal on one stone. If you don't have HCl, if a nail scratches it, hardness of 5, it's probably calcite.
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Post by koolaid on Mar 27, 2008 21:28:31 GMT -5
It is a Calcite from Chihuahua, Mexico that has been acid washed to give it a sheen. Comes in a green color also.
Dennis
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Post by downeast on Mar 28, 2008 20:10:03 GMT -5
Looks like Calcite to me. Try some dilute hydrochlotric acid (10%). If it fizzes - Calcite.
Downeast
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