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Calcite

Calcite

(Science: microscopy) a doubly refracting mineral used in the manufacture of polarizing prisms. It is uniaxial negative and in the trigonal diversion of the hexagonal system of crystals. Its indexes are epsilon =1.486, omega =1.658, its hardness is 3 on the mohr scale and specific gravity 2.711.

See: balsam, canada.


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Any SOLID arguments against evolution?

... THE VAST AMOUNTS OF CALCIUM THAT WOULD HAVE COME FROM THE BONES OF THOSE ANIMALS WHO DID NOT FOSSILIZE? I know that in soil and bedrock is "calcite" that makes cave stalagmites, buffers water and clogs pipes. Large deposits of once living shells and bones are mined for calcium and magnesium. ...

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by GaryGaulin
Thu Jun 04, 2009 8:57 pm
 
Forum: Evolution
Topic: Any SOLID arguments against evolution?
Replies: 106
Views: 16933

The Fiber Disease

... as anything else I had after mold damage loss, I lost it all again). The concrete that had gotten wet, left this stuff growing from top of blocks. Calcite? Really dion't think so.

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by Deena
Fri Dec 15, 2006 6:06 pm
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 749410

Help figuring out what animals these are.

... for at least 600 my and was especially important in the Paleozoic. The group is characterized by a water-vascular system, a skeleton consisting of calcite plates and all adult, living members show a pentameric symmetry. The one we are looking for shows an external bilateral symmetry. They live ...

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by Biology2006
Fri Jun 09, 2006 1:13 pm
 
Forum: Zoology Discussion
Topic: Help figuring out what animals these are.
Replies: 11
Views: 2459


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