mineral
Crocoite
Lead chromate (PbCrO4)
AI-generated identification · may be incorrectHardness: 2.5-3.0 Mohs; Color: Bright hyacinth-red to orange-red; Luster: Adamantine to vitreous; Crystal Structure: Monoclinic; Cleavage: Distinct; Specific Gravity: 5.9-6.1
- Hardness
- 2
- Color
- Bright hyacinth-red to orange-red
- Luster
- Adamantine to vitreous
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Physical properties
Hardness: 2.5-3.0 Mohs; Color: Bright hyacinth-red to orange-red; Luster: Adamantine to vitreous; Crystal Structure: Monoclinic; Cleavage: Distinct; Specific Gravity: 5.9-6.1
Formation & geological history
An oxidation zone mineral typically found in the weathered parts of lead ore deposits, particularly where chromium-containing rocks are present. Notable formations occurred during the Tertiary period.
Uses & applications
Primarily a collector's mineral due to its rarity and striking color. Historically used as a source of chromium and pigments, but currently too rare for industrial use.
Geological facts
Crocoite was the mineral in which the element chromium was first discovered by Louis-Nicolas Vauquelin in 1797. The most world-renowned specimens come from the Adelaide Mine in Tasmania, Australia.
Field identification & locations
Identified by its vivid 'traffic-cone' orange color and prismatic crystal habit. It is very fragile and sensitive to light, which can cause the color to darken over time. Often found associated with pyromorphite or limonite.
