mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Opaque white to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 (Mohs scale)
- Color
- Opaque white to milky
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: Opaque white to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins or as a primary constituent of igneous rocks like granite. This specimen has been rounded by fluvial or marine erosion (water action).
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative landscaping stone or tumbled pocket stones.
Geological facts
Milky quartz gets its cloudy appearance from tiny fluid or gas inclusions trapped during crystal growth. It is one of the most common minerals on Earth's crust.
Field identification & locations
Identified by its white color, inability to be scratched by a steel knife, and smooth, water-worn surface. Found globally in riverbeds and beaches.
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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
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral