mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; translucent white to gray with a glassy-to-waxy luster, irregular conchoidal fracture, and no cleavage. It is likely a water-worn or tumbled fragment, possibly with minor inclusions or internal fractures.
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Physical properties
Hardness 7 Mohs; translucent white to gray with a glassy-to-waxy luster, irregular conchoidal fracture, and no cleavage. It is likely a water-worn or tumbled fragment, possibly with minor inclusions or internal fractures.
Formation & geological history
Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids; milky appearance results from microscopic fluid inclusions and fractures. Quartz is common throughout Precambrian to modern geological settings.
Uses & applications
Used as an inexpensive lapidary, craft, and meditation stone; quartz is also important industrially in glass, ceramics, electronics, and abrasives.
Geological facts
Quartz is one of Earth’s most abundant minerals and forms a major component of granite, sandstone, and many veins.
Field identification & locations
Identify by its hardness—scratches ordinary glass—translucence, lack of cleavage, and conchoidal fracture; unlike calcite, it does not fizz in dilute acid. Common worldwide, especially in hydrothermal veins and quartz-rich rocks.
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Sandstone (with potential mineral staining/concretions)
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sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary