Brockite
A variety of Minerals
What is Brockite?
Brockite is a rare earth phosphate mineral with formula: (Ca,Th,Ce)PO4·H2O. It crystallizes in the hexagonal system. It is typically granular to massive with only rare occurrence of stubby crystals. It is radioactive due to the thorium content.
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Brockite Localities Map
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Key Characteristics
Formation of Brockite
Brockite was first described in 1962 for an occurrence in the Bassick Mine area, Querida, Wet Mountains, Custer County, Colorado, US. It was named for Maurice R. Brock, of the U.S. Geological Survey. Brockite occurs in granite and granite pegmatite as an accessory mineral. Associated minerals include monazite, bastnasite, xenotime, thorite, zircon, apatite, rutile and hematite.
Quick Facts
Physical Properties
- Color
- Reddish brown, yellow
- Hardness (Mohs)
- 3 - 4
- Density
- 3.9 g/cm³
- Streak
- Light yellow
Chemical Properties
- Chemical Formula
- (Ca,Th,Ce)PO4 · H2O
- Elements
- Ca, Ce, H, O, P, Th
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