mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Opaque white to translucent, Luster: Vitreous to waxy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Opaque white to translucent, Luster: Vitreous to waxy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed from hydrothermal solutions or the cooling of magma in igneous rocks like granite. This specific specimen is weather-rounded by fluvial or glacial action.
Uses & applications
Used as a source of silica for glassmaking, in construction aggregates, as decorative landscaping stone, and occasionally in jewelry as cabochons.
Geological facts
The milky appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.
Field identification & locations
Identified by its white color, lack of cleavage, and ability to scratch glass. Commonly found in riverbeds, glacial tills, and beaches worldwide.
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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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic