mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: Opaque white to translucent; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 Mohs
- Color
- Opaque white to translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Opaque white to translucent; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed from hydrothermal veins or as a primary constituent of igneous rocks like granite. This specific specimen has been water-worn into a smooth river pebble shape over thousands of years.
Uses & applications
Used in construction aggregates, glass making, electronics, and as decorative landscape stone or river rock for decorative purposes.
Geological facts
Milky quartz gets its white color from tiny fluid or gas inclusions trapped during crystal growth. It is one of the most common mineral varieties on the Earth's crust.
Field identification & locations
Identify in the field by its hardness (will scratch glass), white color, and lack of cleavage. Commonly found in riverbeds, beaches, and mountain trails worldwide.
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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)
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic