mineral
Quartz crystal cluster
Quartz (silicon dioxide, SiO₂), likely clear or milky quartz
AI-generated identification · may be incorrectHardness 7 Mohs; colorless to milky white, with vitreous luster and transparent-to-translucent crystals. Hexagonal crystal structure, typically lacking cleavage and showing conchoidal fracture; specific gravity about 2.65.
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Physical properties
Hardness 7 Mohs; colorless to milky white, with vitreous luster and transparent-to-translucent crystals. Hexagonal crystal structure, typically lacking cleavage and showing conchoidal fracture; specific gravity about 2.65.
Formation & geological history
Forms when silica-rich hydrothermal fluids or late-stage cavities in igneous rocks precipitate quartz, commonly in geodes and mineral veins. The specimen’s exact geological age and locality cannot be determined from the photograph.
Uses & applications
Used for gemstones, mineral collecting, glass, electronics, and industrial silica. Attractive clusters have modest decorative and display value.
Geological facts
Quartz commonly forms six-sided prismatic crystals ending in pyramidal points, though this cluster appears dominated by irregular or broken crystal faces. Its apparent white coloration may result from inclusions, surface frosting, or weathering.
Field identification & locations
Identify by its glassy luster, sharp angular faces, lack of obvious cleavage, and ability to scratch ordinary glass; a hardness or acid test should be performed cautiously. Common worldwide, especially in Brazil, Madagascar, Arkansas, and Alpine-type veins.
