Crystals formed in sand, soft sandstone, or clay and resembling roses
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Category: <span>D</span>
A dome-shaped mound formed around a volcanic vent
An intrusion of magmatic rock forming between fractures of earlier rock
The housing and shelter for a drill rig
A volcanic vent formed by a gaseous magmatic thrust
A shape having 12 symmetrical sides
Cash or stock awarded to shareholders of a company, usually as incentive for retention.
Land disturbed by the recovery of, or exploration for mineral substances
The process of breaking up a mineral, compound or other matter or entity, into smaller or smallest units
Minerals occurring uniformly, evenly or as particulate