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monoclinicuncommonChromates
Crocoite
PbCrO4
The image displays a cluster of vibrant orange-red, slender, prismatic to acicular crocoite crystals, some forming radiating aggregates, set against a dark matrix.
Crocoite Physical Properties
Mohs Hardness
2.5Crystal System
monoclinicLuster
adamantineStreak Color
orange-yellowCleavage
good on {110}, distinct on {100} and {001}Fracture
unevenSpecific Gravity
5.9Colors
orange-red, bright red, hyacinth redTransparency
translucentType Locality
Congonhas do Campo, Minas Gerais, BrazilMineral Group
ChromatesUses
collector's mineral, minor ore of lead and chromiumAssociated Minerals
cerussite, pyromorphite, wulfenite, mimetite, goethite, limoniteRarity
uncommonGeological Context
Crocoite is a secondary mineral found in the oxidized zones of lead deposits, forming when lead-bearing minerals react with chromium-bearing solutions, often derived from the alteration of ultramafic rocks.
