mineral

Quartz Drusy on Matrix

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: Colorless to white/translucent, Luster: Vitreous (glassy), Crystal Structure: Hexagonal (Trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified June 15, 2026More mineral →

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: Colorless to white/translucent, Luster: Vitreous (glassy), Crystal Structure: Hexagonal (Trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Formed via hydrothermal activity where silica-rich fluids precipitate into cavities in igneous or sedimentary rock. It can form in various geological ages ranging from Precambrian to recent times.

Uses & applications

Primarily used for geological collecting and ornamental decor. Pure quartz is used in optics, electronics (as oscillators), and in the manufacture of glass and glass fiber.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. 'Drusy' or 'Druzy' refers to the coating of fine crystals that look like sugar or glitter on the surface of a host rock.

Field identification & locations

Identify by its hexagonal crystal habit, hardness (it will scratch glass), and lack of cleavage. Often found in geodes, vugs, or as vein fillings in mountainous regions.