Quartz
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameQuartz
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorscolorless, white, light brown
Transparencytransparent
Type LocalityBourg d'Oisans, Isère, Rhône-Alpes, France
Mineral GroupSilicates
Usesjewelry, industrial, collector
Associated Mineralsfeldspar, mica, calcite, pyrite
Raritycommon
Description
This specimen features a dense cluster of sharp, pointed quartz crystals, ranging from clear and transparent to milky white, with some areas exhibiting a light brownish tint.
Geological Context
Quartz is a ubiquitous mineral found in a wide variety of geological settings, including igneous, metamorphic, and sedimentary rocks, often forming in hydrothermal veins or pegmatites.
