mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: White/Opaque, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White/Opaque, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65
Formation & geological history
Found in igneous, metamorphic, and sedimentary rocks. Forms through hydrothermal processes, crystallization from magma, or precipitation from fluids. Common in many geological ages.
Uses & applications
Used in glass manufacturing, electronics (piezoelectric properties), abrasives, watches, and as a common collector's mineral.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its white appearance from microscopic fluid inclusions trapped during growth.
Field identification & locations
Identified by its ability to scratch glass, lack of cleavage (conchoidal fracture), and white color. Found globally in veins and riverbeds.
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Other mineral specimens
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Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Mineral Sand (Heavy Mineral Sand Concentrate)
Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite
mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic