mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Clear to translucent white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Clear to translucent white
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 (Mohs scale); Color: Clear to translucent white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed in igneous, metamorphic, and sedimentary environments through the cooling of silica-rich magma or from hydrothermal veins. Occurs in various geological ages globally.
Uses & applications
Used in electronics (oscillators), manufacturing of glass and ceramics, abrasives, jewelry, and as decorative metaphysical specimens.
Geological facts
Clear quartz is the most common mineral on Earth's continental crust. These specific specimens are 'points' or segments that have been partially polished or tumble-finished for sale.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and vertical striations on crystal faces. Found worldwide, with major deposits in Brazil and Arkansas, USA.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
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