mineral
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Opaque white to translucent milky white, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Opaque white to translucent milky white, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed from hydrothermal solutions or during the final stages of cooling in igneous magma. The milky appearance is caused by tiny fluid inclusions of gas or liquids trapped during crystal growth. This specific specimen has been water-worn into a smooth pebble shape.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), abrasives, landscaping, and as decorative gemstones or pocket stones.
Geological facts
Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many indigenous cultures to make tools and weapons where flint was unavailable.
Field identification & locations
Identify by its hardness (it will scratch glass), white color, and the absence of cleavage planes. Found worldwide in riverbeds, beaches, and mountain veins.
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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