Image: <bdi><a href="https://www.wikidata.org/wiki/Q108103612" class="extiw" title="d:Q108103612"><span title="Wikipedian and OpenStreetMap mapper from Cologne, Open Data activist">Raimond Spekking</span></a></bdi> (CC BY-SA 4.0)
tetragonalcommonSulfides
Chalcopyrite
CuFeS₂
This specimen features brass-yellow, metallic chalcopyrite crystals, some displaying iridescent tarnish, intergrown with white quartz crystals and brownish siderite.
Chalcopyrite Physical Properties
Mohs Hardness
3.5Crystal System
tetragonalLuster
metallicStreak Color
greenish-blackCleavage
poor/indistinctFracture
unevenSpecific Gravity
4.2Colors
brass-yellow, golden-yellow, iridescentTransparency
opaqueType Locality
Friedrich Wilhelm mine, Herdorf, Siegerland, Westphalia, GermanyMineral Group
SulfidesUses
copper ore, collector specimensAssociated Minerals
quartz, sideriteRarity
commonGeological Context
Chalcopyrite is a widespread sulfide mineral found in various geological settings, including hydrothermal veins, disseminated in igneous rocks, and in massive sulfide deposits, often forming at moderate to high temperatures.
