mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs), Color: Translucent white to milky cream, Luster: Vitreous to greasy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None (Conchoidal fracture)
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Physical properties
Hardness: 7 (Mohs), Color: Translucent white to milky cream, Luster: Vitreous to greasy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed through hydrothermal processes or during the final stages of cooling in igneous intrusions. This specific specimen has been wave-tumbled or river-worn, giving it a smooth, rounded shape.
Uses & applications
Used in glassmaking, jewelry (as cabochons), electronics for its piezoelectric properties, and construction aggregate.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' look is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Look for a glassy luster and a hardness that can scratch glass. This specific shape is found mostly in riverbeds and on beaches worldwide.
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Other mineral specimens
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