mineral
Quartz and Limestone Grouping
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
Hardness varies from 3 (limestone/calcite) to 7 (quartz). Luster ranges from vitreous to dull/earthy. Color varies from milky white, translucent gray, to charcoal gray and tan-yellow.
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Physical properties
Hardness varies from 3 (limestone/calcite) to 7 (quartz). Luster ranges from vitreous to dull/earthy. Color varies from milky white, translucent gray, to charcoal gray and tan-yellow.
Formation & geological history
Quartz typically forms in igneous pegmatites, hydrothermal veins, and metamorphic rocks. Limestone forms in shallow marine environments from organic debris or chemical precipitation.
Uses & applications
Quartz is used in glassmaking, electronics, abrasives, and as gemstones. Limestone is heavily used in construction, concrete manufacturing, and agriculture.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Quartz veins often harbor precious metals such as gold.
Field identification & locations
Identify quartz by its hardness (scratches glass) and conchoidal fracture. Identify limestone by testing with dilute acid (effervesces) or its softness.
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Mineral
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Mineral/Rock