mineral
Aragonite / Calcite Geode
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3-4 (Mohs scale), Color: Colorless to white/pale yellow with orange-brown iron staining, Luster: Vitreous to pearly, Crystal structure: Orthorhombic or Trigonal, Cleavage: Perfect rhombohedral
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Physical properties
Hardness: 3-4 (Mohs scale), Color: Colorless to white/pale yellow with orange-brown iron staining, Luster: Vitreous to pearly, Crystal structure: Orthorhombic or Trigonal, Cleavage: Perfect rhombohedral
Formation & geological history
Formed through the precipitation of calcium-rich groundwater in sedimentary cavities or volcanic rock voids. This piece appears to be a smaller vug or geode portion often found in desert environments.
Uses & applications
Primarily used for geological collecting, decorative display, and metaphysical purposes. Industrial uses of calcium carbonate include cement production and agricultural lime.
Geological facts
Aragonite and Calcite are polymorphs; they share the same chemical formula but have different crystal structures. Over long geological time scales, aragonite often converts into calcite.
Field identification & locations
Identify in the field by its crystal habit and a positive reaction (fizzing) when exposed to a drop of weak acid (dilute HCl or vinegar). Often found in limestone caves or weathered sedimentary outcrops.
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