mineral
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Clear to light tan/golden brownish due to iron oxide staining. Luster: Vitreous (glassy). Crystal Structure: Hexagonal prismatic crystals with pyramidal terminations. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Color: Clear to light tan/golden brownish due to iron oxide staining. Luster: Vitreous (glassy). Crystal Structure: Hexagonal prismatic crystals with pyramidal terminations. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids precipitated quartz crystals inside cavities, veins, or geodes within a dark host rock matrix (likely basalt, shale, or iron-rich bedrock).
Uses & applications
Popular as mineral display specimens, crystal healing items, ornamental decor, and collected by rockhounds. Pure quartz is used in electronics and glassmaking.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Iron oxide surface coatings often give white or clear quartz crystals a natural golden or yellowish patina.
Field identification & locations
Identified by hexagonal elongated prisms that easily scratch glass (Mohs 7) and exhibit a glassy luster with no cleavage. Common in Arkansas (USA), Brazil, Madagascar, and worldwide in Alpine-type veins.
