mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, white to off-white opaque color, vitreous luster when clean, hexagonal/trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Mohs hardness of 7, white to off-white opaque color, vitreous luster when clean, hexagonal/trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Forms in hydrothermal veins or igneous pegmatites. The white color is caused by microscopic fluid inclusions trapped during the crystal's growth.
Uses & applications
Used in glass making, as an abrasive, in the electronics industry for its piezoelectric properties, and commonly as decorative gravel or landscaping stone.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found in nature.
Field identification & locations
Identify in the field by its hardness (it scratches glass) and lack of cleavage (it breaks in smooth, curved surfaces). It is ubiquitous worldwide.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary