Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
orthorhombiccommonOxides
Goethite
FeO(OH)
This specimen features dark, almost black, botryoidal to acicular goethite crystals forming a crust or growth on translucent to white quartz crystals.
Goethite Physical Properties
Mohs Hardness
5.5Crystal System
orthorhombicLuster
adamantineStreak Color
yellowish-brownCleavage
perfect on {010}Fracture
unevenSpecific Gravity
3.3Colors
dark brown, black, yellowish-brown, reddish-brownTransparency
opaqueType Locality
Graves Mountain, Lincoln County, Georgia, USAMineral Group
OxidesUses
minor iron ore, pigment, collectorAssociated Minerals
quartzRarity
commonGeological Context
Goethite is a common secondary mineral formed by the weathering of iron-bearing minerals in various environments, including hydrothermal deposits, sedimentary settings, and as a component of lateritic soils. It is a major constituent of limonite.
