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Rocks In My Head

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geology et al
some days are pretty good
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Rock Shop
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05/14/09
SHOP IS A MESS

My rock shop is in disarray.  Enough said.  Moving right along...  The next mineral group to consider is the carbonates.  There are more than 70 minerals in this classification  but only the calcite and dolomite groups are found in abundance.

 Calcite is very common.  It is the main constituent of limestone.  Many fossils are calcium carbonate skeletons of algae and invertebrates.  Under pressure, limestone turns into the metamorphic rock marble.

Siderite is another member of the group.  It oxidizes into limonite.  I just recently traded for some limonite crystals from England.


Posted by oh5/ojhoff at 8:06 AM CDT
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