mineral
Quartz / Common Gravel
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: White to translucent tan, Luster: Vitreous to dull (weathered), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture)
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent tan, Luster: Vitreous to dull (weathered), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed through hydrothermal processes, igneous crystallization, or as weather-resistant fragments in sedimentary deposits. These specimens look like common clastic surface gravel.
Uses & applications
Common gravel is used extensively in construction, road base, and as decorative landscaping material. Pure quartz is used in glassmaking and electronics.
Geological facts
Quartz is the most abundant and widely distributed mineral found at Earth's surface. It is highly resistant to both chemical and mechanical weathering.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel blade) and lack of cleavage. Found globally in almost all geological environments.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary