mineral

Milky Quartz Geode with Chlorite

Silicon Dioxide (SiO2) with Chlorite group inclusions

Hardness: 7 Mohs scale; Color: Opaque white to translucent milky white with green mossy patches; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 Mohs scale
Luster: Vitreous to greasy

Identified February 24, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed by the precipitation of silica from hydrothermal fluids or groundwater within cavities (vugs) of a host rock. Carboniferous to Cenozoic ages depending on location. The green coloration is due to Chlorite mineral inclusions or surface coating.

Uses & applications

Used primarily for lapidary work, landscaping, and as educational or decorative specimens for mineral collectors. High-purity quartz is used in electronics and glass manufacturing.

Geological facts

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

Field identification & locations

Identify in the field by its distinct hexagonal crystal faces within cavities and its inability to be scratched by a steel knife. Commonly found in mountainous regions or riverbeds. Collectors should look for intact crystal terminations inside the pocket.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

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

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral