mineral
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Colorless to pale yellowish; Luster: Vitreous/Glassy; Crystal structure: Trigonal (hexagonal system); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
- Hardness
- 7 (Mohs scale)
- Color
- Colorless to pale yellowish
- Luster
- Vitreous/Glassy
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Physical properties
Hardness: 7 (Mohs scale); Color: Colorless to pale yellowish; Luster: Vitreous/Glassy; Crystal structure: Trigonal (hexagonal system); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
Formation & geological history
Formed primarily from hydrothermal solutions in igneous and metamorphic rocks. It can also form in sedimentary environments. Quartz is found in almost all geological ages.
Uses & applications
Extensively used in jewelry (as gemstones), electronics (piezoelectric properties), glassmaking, and alternative healing (rock crystal collecting).
Geological facts
Clear quartz is the most iconic type of quartz. It has been used historically for lens making and 'crystal balls'. It's known for its ability to convert mechanical stress into electrical voltage.
Field identification & locations
Identify by its hardness (will scratch glass), lack of bubbles (distinguishing it from man-made glass), and conchoidal fracture. Often found in vein deposits or weathered out into stream beds.
More like this
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