mineral

Milky Quartz Pebble with Inclusions

Crystalline Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white with dark grey/green inclusions; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white with dark grey/green inclusions
Luster: Vitreous to greasy

Identified June 18, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white with dark grey/green inclusions; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65

Formation & geological history

Formed via hydrothermal activity where mineral-rich hot water cools in crustal veins; often contains inclusions of chlorite, tourmaline, or mica. This pebble has been water-worn and smoothed by river or beach action.

Uses & applications

Commonly used in landscaping, as tumbling rough for hobbyists, and in industrial glass making or abrasives when found in bulk. Small pebbles like this are primarily for personal collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny bubbles of gas or liquid trapped during crystal growth.

Field identification & locations

Identify by its white opaque color, inability to be scratched by a steel knife, and smooth, water-worn texture. Found globally in riverbeds and along coastlines.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

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