mineral
Clear Quartz
Silicon Dioxide (SiO2)
Hardness 7 on Mohs scale, transparent/colorless, vitreous (glassy) luster, trigonal crystal system, no cleavage, specific gravity ~2.65.
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Physical properties
Hardness 7 on Mohs scale, transparent/colorless, vitreous (glassy) luster, trigonal crystal system, no cleavage, specific gravity ~2.65.
Formation & geological history
Forms in igneous, metamorphic, and sedimentary environments through hydrothermal fluids, magmatic crystallization, or solution deposition.
Uses & applications
Used in jewelry, electronics (piezoelectric applications, quartz oscillators), glassmaking, and gemstone collections.
Geological facts
Clear quartz is often referred to as Rock Crystal. The ancient Greeks believed it was ice frozen so hard that it would never melt.
Field identification & locations
Identify by its hardness (scratches glass), glass-like transparency, conchoidal fracture, and lack of true cleavage planes. Found abundantly worldwide.
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Septarian Pebble
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Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
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