mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7; Color: Opaque white to cream with reddish iron staining; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65.
- Hardness
- 7
- Color
- Opaque white to cream with reddish iron staining
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7; Color: Opaque white to cream with reddish iron staining; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins or igneous pegmatites when silica-rich fluids cool. Milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and as landscaping stone. Low-grade specimens are common for beginner collectors.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' look is due to microscopic fluid inclusions that scatter light.
Field identification & locations
Identified by its ability to scratch glass and its lack of cleavage. Often found in riverbeds, mountains, and gravel pits across the globe.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock