mineral
Milky Quartz (Druzy Coating)
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
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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
Forms in hydrothermal veins or as crystals in pegmatites. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in the production of glass, ceramics, and abrasives. High-quality pieces are used for home decor, spiritual practices, and mineral collections.
Geological facts
Milky quartz is the most common variety of crystalline quartz. The tiny fluid inclusions that give it its white color are often studied by geologists to understand the chemistry of ancient hydrothermal fluids.
Field identification & locations
Identified by its white color, inability to be scratched by steel, and lack of cleavage. Common worldwide. For collectors, look for the 'sparkle' created by tiny druzy crystals on the surface.
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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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
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Nephrite
Mineral/Rock