Quartz
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Mineral NameQuartz
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorscolorless, white, purple, brown
Transparencytransparent
Type LocalityWorldwide
Mineral GroupSilicates
Usesjewelry, industrial, collector specimens
Associated Mineralsfeldspar, mica, calcite
Raritycommon
Description
A collection of various quartz crystals, including clear, smoky, and light purple (amethyst) varieties, displayed as individual specimens on a glass shelf. The crystals exhibit well-formed prismatic habits with distinct terminations.
Geological Context
Quartz is a ubiquitous mineral found in igneous, metamorphic, and sedimentary rocks, often crystallizing from silica-rich fluids in hydrothermal veins, pegmatites, and geodes. Its formation is indicative of a wide range of geological processes and temperatures.
