mineral
Faceted Clear Quartz
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Colorless (clear); Luster: Vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Colorless (clear)
- Luster
- Vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Colorless (clear); Luster: Vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms in a wide variety of environments, most commonly in igneous rocks like granite from hydrothermal veins or in sedimentary geodes and metamorphic rocks. Most specimens are millions of years old.
Uses & applications
Used extensively in jewelry as a gemstone, in watchmaking (quartz movements), electronics for its piezoelectric properties, and by collectors.
Geological facts
Quartz is the most abundant and diverse mineral on Earth's surface. In its pure form, it is perfectly clear and is often called 'Rock Crystal'.
Field identification & locations
Identified by its ability to scratch glass, lack of cleavage, and faceted cut in this instance. Found globally, especially in Brazil, Arkansas (USA), and Madagascar.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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
Granite
Granite (Phaneritic intrusive igneous rock)
igneous