igneous
Quartz in Matrix (or Quartz Vein Rock)
Silicon Dioxide (SiO2) with host rock
Hardness of 7 on the Mohs scale, white and dark grey/black coloration, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white and dark grey/black coloration, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and specific gravity around 2.65.
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids crystallized within fractures or faults of host rock under high pressure and temperature conditions, often occurring in metamorphic or igneous terrains.
Uses & applications
Used primarily in decorative landscaping, specimen collecting, and occasionally cut for lapidary work or jewelry.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and frequently occurs in hydrothermal veins, showcasing strong contrasting bands of white quartz and dark host rock.
Field identification & locations
Easily identified by its high hardness (scratches glass) and the sharp contrast between milky white quartz and the darker enclosing rock matrix. Found worldwide in mountainous and mineralized regions.
