mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous (glassy) to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous (glassy) to greasy

Identified March 30, 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 from cooling silica-rich hydrothermal fluids in veins or as a late-stage crystallization in igneous rocks. While quartz can be any age, these vein deposits are found in Precambrian to Cenozoic formations.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, construction aggregates, and as a semi-precious gemstone in jewelry or for decorative carvings.

Geological facts

Quartz is the most abundant mineral in Earth's continental crust. Milky quartz gets its iconic white color from microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage planes. It is commonly found in riverbeds, mountain ranges, and gravel pits worldwide. Collectors should look for distinct crystal faces or internal clarity.