| http://www.w3.org/ns/prov#value | - The forms that have been observed on calcite crystals are arranged in such a manner as to produce three distinct types of habit, as follows: (1) the rhombohedral type, bounded by the flat rhombohedrons and often blunt scalenohedrons, (2) the prismatic type, with the prism predominating as the principal termination; and (3) dog-tooth spar, containing the same scalenohedrons as on the first type men
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