Mineral/Geode
Quartz Geode with Calcite
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
Quartz: Hardness 7, colorless to white, vitreous luster. Calcite: Hardness 3, rhombohedral cleavage, pale color.
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Physical properties
Quartz: Hardness 7, colorless to white, vitreous luster. Calcite: Hardness 3, rhombohedral cleavage, pale color.
Formation & geological history
Formed in vesicles of volcanic rocks or sedimentary cavities where mineral-rich groundwater precipitated the crystals over long geological periods.
Uses & applications
Collectible specimen, decorative piece, metaphysical applications.
Geological facts
Geodes are typically hollow, spherical rocks with a cavity lined with crystals. The presence of large blocky calcite crystals growing on the finer quartz druzy is a classic paragenesis.
Field identification & locations
Identified by the rough, non-descript outer rind contrasting with the crystalline interior. Calcite can be distinguished from quartz by its lower hardness and cleavage.
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