mineral
Quartz with Calcite
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
Hardness 7 (Quartz) and 3 (Calcite); color ranges from milky white to translucent yellowish; vitreous to pearly luster; trigonal crystal system for quartz and rhombohedral for calcite.
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Physical properties
Hardness 7 (Quartz) and 3 (Calcite); color ranges from milky white to translucent yellowish; vitreous to pearly luster; trigonal crystal system for quartz and rhombohedral for calcite.
Formation & geological history
Formed in hydrothermal veins, pegmatites, or sedimentary rock cavities where silica-rich and carbonate-rich fluid solutions cool and crystallize over geological time.
Uses & applications
Used primarily as mineral specimens for collectors, decorative stones, and occasionally in metaphysical or crystal healing practices.
Geological facts
Quartz and calcite are two of the most abundant minerals on Earth's crust, often co-existing together in geode cavities and mineral veins.
Field identification & locations
Identified by checking hardness: quartz will easily scratch glass, while calcite fizzes in mild acid (dilute HCl) and can be scratched by a copper coin.
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