mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Milky white to cream
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed from silica-rich hydrothermal fluids cooling in veins or as a component of igneous and metamorphic rocks. Frequently found as water-worn pebbles in riverbeds or beaches.
Uses & applications
Used as a gemstone (cabochons), in glass making, as a source of silicon for electronics, and in decorative landscaping or aquarium gravel.
Geological facts
The milky white color is caused by tiny inclusions of gas or liquid trapped during crystal growth. It is one of the most common minerals on the Earth's crust.
Field identification & locations
Identify in the field by its hardness (scratches glass), white color, and lack of cleavage. Often found in riverbeds, mountain veins, and glacial deposits globally.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock