mineral

Quartz (Chert/Quartzite variant)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale); Color: Tan, brown, and greyish; Luster: Vitreous to waxy; Crystal structure: Hexagonal (though massive/microcrystalline in this form); Specific gravity: approx. 2.65

Hardness: 7 (Mohs scale)
Color: Tan, brown, and greyish
Luster: Vitreous to waxy

Identified July 6, 2026More mineral →

Explore Quartz (Chert/Quartzite variant) in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 7 (Mohs scale); Color: Tan, brown, and greyish; Luster: Vitreous to waxy; Crystal structure: Hexagonal (though massive/microcrystalline in this form); Specific gravity: approx. 2.65

Formation & geological history

Formed primarily through the chemical precipitation of silica or from the metamorphism of quartz-rich sandstone. Most commonly found in sedimentary sequences or as veins in various rock types.

Uses & applications

Largely used as an abrasive, in glass manufacturing, or as construction aggregate. Historically used for making tools like scrapers and arrowheads due to its conchoidal fracture.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. It is highly resistant to both chemical and physical weathering.

Field identification & locations

Check for hardness by seeing if it scratches glass. Look for the characteristic conchoidal fracture (curved, shell-like breaks) and a lack of cleavage. Common in riverbeds and gravel pits.