mineral
Quartz with Calcite / Geode Fragment
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
Hardness 7 for quartz, 3 for calcite. Color ranges from white to pale tan, cream, and beige. Vitreous to dull earthy luster, trigonal/hexagonal crystal system, indistinct cleavage in quartz.
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Physical properties
Hardness 7 for quartz, 3 for calcite. Color ranges from white to pale tan, cream, and beige. Vitreous to dull earthy luster, trigonal/hexagonal crystal system, indistinct cleavage in quartz.
Formation & geological history
Formed through hydrothermal deposition in cavities or geodes within sedimentary host rocks such as limestone, or as secondary mineral crystallization in volcanic rocks.
Uses & applications
Used primarily for mineral specimens, lapidary collection, educational study, and decorative pieces.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Geode fragments like this often show internal crystalline structures that formed over thousands to millions of years.
Field identification & locations
Look for visible crystalline faces, a glassy to greasy luster on fresh surfaces, and resistance to scratching steel. Commonly found in limestone quarries, gravel beds, and stream channels.
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