M.J. Hibbard
Calcite


Calcite   CaCO3    Hexagonal-rhombohedral
o Hydrothermal environment. (chapter 12)
- Nailhead calcite crystals (largest is 2 cm in diameter) dominated by the hexagonal prism {100}. The larger crystal is terminated by faces of the "flat" rhombohedron {012} , whereas the small crystal (lower left) is terminated by faces of the {211} scalenohedron and basal pinacoid {001}. Sample provided by H. Gordon.

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