mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; cloudy white to pale pink with a vitreous-to-waxy luster. Massive, with no visible cleavage and conchoidal fracture; crystal structure is trigonal, though crystals are not apparent here.
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Physical properties
Hardness 7 Mohs; cloudy white to pale pink with a vitreous-to-waxy luster. Massive, with no visible cleavage and conchoidal fracture; crystal structure is trigonal, though crystals are not apparent here.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids in veins and pegmatites, or forms in igneous and metamorphic rocks. The image shows a rounded, likely tumbled specimen; its geological age and source cannot be determined visually.
Uses & applications
Used for ornaments, beads, and decorative stone, as well as in glassmaking and electronics when suitably pure.
Geological facts
Milky color results from microscopic fluid or gas inclusions that scatter light.
Field identification & locations
Likely quartz based on its pale, cloudy appearance and rounded polish; confirm hardness with a scratch test only on an inconspicuous area. Quartz occurs worldwide, including Brazil, Madagascar, and the United States.
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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