mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to tan/peach with iron staining, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal (massive form), Cleavage: None (conchoidal fracture)
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Physical properties
Hardness: 7 (Mohs scale), Color: White to tan/peach with iron staining, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal (massive form), Cleavage: None (conchoidal fracture)
Formation & geological history
Forms in hydrothermal veins or as a constituent of igneous rocks like granite. This specific specimen is a water-worn river pebble, likely shaped by long-term alluvial erosion.
Uses & applications
Industrial uses include glassmaking, abrasives, and as a source of silicon for electronics. Rounded pebbles are often used in landscaping or as decorative stones.
Geological facts
Quartz is one of the most abundant minerals on Earth. The cloudy white appearance of 'milky' quartz is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of cleavage, and waxy luster. Common in riverbeds, glacial tills, and mountain ranges 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
Granite
Granite (Phaneritic intrusive igneous rock)
igneous