Formula: Na3Mg(PO4)(CO3) compound phosphate
Specific gravity: 2.734
Hardness: 3 to 4
Streak: White
Colour: Light grey
Solubility: Slowly decomposed by cold water; readily soluble in dilute hydrochloric acid

Sedimentary environments

Bradleyite is a rare mineral in oil shale deposits of the Green River formation in Colorado, Wyoming and Utah, USA.