Clear Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Forms in igneous, metamorphic, and sedimentary environments. It commonly crystallizes from silica-rich hydrothermal veins or cooling magma (pegmatites). It is found in rocks ranging from precambrian to recent ages.

Uses & Applications

Used in electronics (oscillators), glassmaking, abrasives, jewelry, optical instruments, and widely collected as healing crystals or specimens.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Piezoelectric properties allow it to generate an electric charge under mechanical stress, which is why it is used in watches.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass), its conchoidal (shell-like) fracture, and lack of true cleavage. It is found worldwide, with major deposits in Brazil and Arkansas, USA.

Identified on: 4/28/2026

Mode: Standard