mineral
Milky Quartz in Siltstone or Feldspar
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to translucent with orange-brown matrix; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture)
- Hardness
- 7 on Mohs scale
- Color
- Milky white to translucent with orange-brown matrix
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent with orange-brown matrix; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed from hydrothermal solutions or the cooling of silica-rich magma in veins. Often found in varying geological ages across igneous and metamorphic environments.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), and as decorative stones or gemstones in jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its cloudy appearance from microscopic inclusions of fluids or gas trapped during crystal growth.
Field identification & locations
Identified in the field by its hardness (it will scratch glass), its lack of cleavage, and its vitreous luster. Found worldwide in nearly all geological environments.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock