mineral
Quartz Druzy / Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Clear to light yellowish-tan/brownish due to iron oxide staining. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Color: Clear to light yellowish-tan/brownish due to iron oxide staining. Luster: Vitreous (glassy). Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids cooled and precipitated quartz crystals in cavities, fractures, or geodes within sedimentary, metamorphic, or igneous rocks.
Uses & applications
Widely used as mineral specimens for rock collectors, home decor, metaphysical practices, and occasionally crushed for industrial silica extraction or cut into gemstones.
Geological facts
Quartz is one of the most abundant minerals on Earth's surface. Druzy quartz coatings consist of tiny, sparkling quartz crystals coating a rock surface or geode cavity wall.
Field identification & locations
Identify in the field by its hardness (scratches glass readily), hexagonal prismatic crystal habits, glassy luster, and lack of true cleavage. Commonly found worldwide in granitic pegmatites, quartz veins, and limestone geodes.
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FeO(OH)·nH2O / FeO(OH)
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Schist
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Septarian Pebble
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