metamorphic
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
Hardness: Quartz (7) vs Matrix (3-4); Color: White/orange quartz with grey/charcoal host; Luster: Vitreous quartz, dull matrix; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal.
- Hardness
- Quartz (7) vs Matrix (3-4)
- Color
- White/orange quartz with grey/charcoal host
- Luster
- Vitreous quartz, dull matrix
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Physical properties
Hardness: Quartz (7) vs Matrix (3-4); Color: White/orange quartz with grey/charcoal host; Luster: Vitreous quartz, dull matrix; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal.
Formation & geological history
Formed through hydrothermal precipitation where mineral-rich hot fluids filled fractures in existing sedimentary or metamorphic rock during tectonic mountain-building events.
Uses & applications
Primarily of interest to students of geology and amateur collectors; quartz veins can occasionally be indicators of precious metal mineralization like gold.
Geological facts
Quartz veins are 'fossilized' signatures of fluid movement through the Earth's crust; these fluids are often what transport gold and other rare minerals into concentrated deposits.
Field identification & locations
Identify by the distinct 'banded' or striped appearance where a hard, glassy mineral cuts through a softer, darker rock. Common in folded mountain belts and metamorphic terrains.
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