mineral
Clear Quartz (Faceted Crystal)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, transparent to translucent clarity, vitreous (glassy) luster, trigonal/hexagonal crystal system, no cleavage, conchoidal fracture.
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Physical properties
Hardness 7 on Mohs scale, transparent to translucent clarity, vitreous (glassy) luster, trigonal/hexagonal crystal system, no cleavage, conchoidal fracture.
Formation & geological history
Formed in hydrothermal veins, pegmatites, and igneous, metamorphic, and sedimentary rocks across various geological eras.
Uses & applications
Used widely in jewelry, lapidary arts, decorative faceted gems, frequency control in electronics, and healing/crystal collecting.
Geological facts
Clear quartz is often referred to as 'rock crystal'. Faceted specimens like this one are cut and polished by lapidaries to enhance light reflection and brilliance.
Field identification & locations
Identified by its glass-like transparency, ability to scratch glass (Mohs 7), and lack of true cleavage. Extremely common worldwide, with key sources in Brazil, Madagascar, and Arkansas, USA.
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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
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral