mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: cloudy white or opaque, Luster: vitreous (glassy) to greasy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: cloudy white or opaque, Luster: vitreous (glassy) to greasy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins, pegmatites, and as a primary mineral in igneous, metamorphic, and sedimentary rocks. Its characteristic white color is caused by microscopic inclusions of fluid (gas or liquid) trapped during crystal growth.
Uses & applications
Used in glassmaking, ceramics, electronics (as a silicon source), and widely used in jewelry (tumbled stones, beads) and landscaping.
Geological facts
Milky quartz is one of the most common varieties of quartz on Earth. The 'milkiness' comes from tiny gas or liquid bubbles rather than impurities, which scatter light like fog in the air.
Field identification & locations
Identify by its white, waxy, or glassy appearance and its ability to scratch glass easily. It is found globally, particularly in areas with active or old geological mountain-building activity.
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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
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral