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Dolomite (CaMg(CO3)2) NS2140B |
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![Image: NS2140B.jpg](../minerals_jpg/NS2140B.jpg) |
Crystal system |
hexagonal. |
Habit |
rhombohedrons with curved faces; prismatic with rhombohedron terminations; massive, granular or fibrous; rarely tabular or octahedral. |
Cleavage |
perfect. |
Fracture |
subconchoidal. |
Hardness |
3.5-4 |
Specific Gravity |
2.8 |
Color |
colorless, white, gray, green, pale brown, pink. |
Luster |
transparent to subtranslucent with a vitreous or pearly luster. |
Streak |
none. |
Distinguishing features |
like calcite, dolomite reacts to HCl acid by bubbling - the difference is that dolomite reacts much more slowly than calcite. |
Uses |
used in making refractory bricks for the linings of furnaces and as a building material.
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