mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, milky white to pale cream color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, milky white to pale cream color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Forms in igneous pegmatites, hydrothermal veins, and metamorphic rocks. The milky appearance is caused by tiny fluid inclusions trapped during crystal growth.
Uses & applications
Used in glassmaking, ceramics, electronics (piezoelectric applications), abrasives, and as decorative gravel or mineral specimens.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but microscopic fluid gas/liquid bubbles turn it milky white.
Field identification & locations
Identified by its ability to easily scratch glass and steel, lack of cleavage, milky translucency, and hexagonal/crystalline texture. Found abundantly 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