mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Clear/Colorless; Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Clear/Colorless
- Luster
- Vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Clear/Colorless; Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Formed from silica-rich hydrothermal solutions or the cooling of magma in igneous rocks like granite. Found in environments spanning from metamorphic to sedimentary deposits over millions of years.
Uses & applications
Used in electronics (oscillators), optical instruments, jewelry, glassmaking, and metaphysical collections.
Geological facts
Quartz is the second most abundant mineral in Earth's crust. 'Rock crystal' was once believed by ancient Greeks to be ice that had frozen so hard it could never melt.
Field identification & locations
Identify by its hardness (scratches glass), lack of bubbles (unlike glass), and conchoidal fracture. Commonly found in riverbeds, mountains, and mines worldwide.
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Gneiss or Mica Schist with Garnet
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
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Septarian Pebble
Septarian nodule / Concretion
sedimentary