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MINERALS INDEX
Dolomite |
| CaMg(CO3)2 |
| Hexagonal-rhombohedral |
Crystals of dolomite are rare, and only simple unit rhombohedrons were seen. The mineral is found also in massive granular form.
The only well-defined occurrence of dolomite was in the Buckwheat mine at Franklin, where the stripping exposed a zone of gray dolomitic limestone, fine granular to compact and porous in places, which cut across the white limestone between the two legs of the ore body. Some cavities, several inches across, were lined with drusy rhombohedral crystals of white pearly dolomite. In the cavities and of later formation were calcite, quartz, albite, sphalerite, pyrite, millerite, hematite, and goethite, mostly well crystallized.
In many secondary veins in the ore body at Franklin are found rhombohedral carbonates that arc more or less magnesian but that contain also, besides calcium, some manganese, iron, and zinc. Some of them may properly belong under dolomite, but in the absence of analyses they cannot be exactly defined.
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Website
© by Herb Yeates 1997-2001.
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This
page created: January 12, 2001 5:59 PM
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