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.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Brockite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
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
- Rock tumbling
- Not recommended
- 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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Brockite FAQs
How do I identify Brockite?
Brockite can be identified by its hardness of 3 - 4 on the Mohs scale, Reddish brown color. Look for these key characteristics when examining specimens.
What color is Brockite?
Brockite typically appears in Reddish brown, yellow. Color can vary depending on impurities and formation conditions.
How hard is Brockite?
Brockite has a hardness of 3 - 4 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the formation of brockite 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.
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