mineral
Clear quartz crystal
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectColorless to milky white, transparent to translucent, with a vitreous luster and hexagonal crystal structure; Mohs hardness 7, no cleavage, and conchoidal fracture. The image shows a small rough crystal, though its exact identity cannot be confirmed from appearance alone.
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Physical properties
Colorless to milky white, transparent to translucent, with a vitreous luster and hexagonal crystal structure; Mohs hardness 7, no cleavage, and conchoidal fracture. The image shows a small rough crystal, though its exact identity cannot be confirmed from appearance alone.
Formation & geological history
Quartz crystallizes from silica-rich magma and hydrothermal fluids, and also forms in metamorphic and sedimentary settings. It occurs in rocks of many geological ages.
Uses & applications
Used in jewelry, ornaments, glassmaking, abrasives, and electronic components; clear, well-formed crystals are collected.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under mechanical stress.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch glass, and lack of cleavage; it is common worldwide, including in Brazil, the United States, and Madagascar.
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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