Mineral in Igneous/Sedimentary host
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Hardness: 7 (quartz), 5-6 (matrix); Color: Milky white to translucent quartz, reddish-brown to grey matrix; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 (quartz), 5-6 (matrix)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (quartz), 5-6 (matrix); Color: Milky white to translucent quartz, reddish-brown to grey matrix; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed by hydrothermal activity where silica-rich fluids filled fractures in existing volcanic or sedimentary rock. This often occurs during tectonic events or proximity to volcanic centers.
Uses & applications
Used primarily as decorative specimens for collectors, or if high quality, as lapidary material for cabochons. Milky quartz is also a source of silica for industrial glass making.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz often acts as a host for gold, making it a primary target for historical and modern prospecting.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and lack of cleavage. Common in mountainous regions with a history of volcanic or metamorphic activity.
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