mineral

Quartz (Druzy or Crystalline)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Clear to milky white
Luster: Vitreous (glassy)

Identified June 29, 2026More mineral →

Explore Quartz (Druzy or Crystalline) 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 on Mohs scale; Color: Clear to milky white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich hydrothermal fluids in rock cavities or veins. It can occur in nearly all geological ages and environments, often crystallizing as the last stage of igneous cooling or within sedimentary geodes.

Uses & applications

Used in watchmaking (quartz movement), electronics (piezoelectric properties), glass manufacturing, abrasives, and as a popular gemstone for jewelry and metaphysical collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. 'Druzy' refers specifically to the tiny glittering crystals that form on the surface of another stone.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and hexagonal crystal shapes. Found globally, especially in mountain ranges and volcanic areas like Brazil, Arkansas (USA), and the Alps.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock