Montgomeryite

Montgomeryite is a phosphate mineral with the chemical formula Ca₄MgAl₄(PO₄)₆(OH)₄·12H₂O.^[1] The mineral was discovered in Fairfield, Utah in a variscite nodule.^[3][4] Montgomeryite is a very rare mineral and can only be found in a few places in the world.^[5]

Montgomeryite
Montgomeryite found in South Australia
General
Category	Phosphate mineral
Formula	Ca4MgAl4(PO4)6(OH)4·12H2O[1]
IMA symbol	Mgm[2]
Identification
Color	Dark green to light green, colorless, red, yellow[1]
Mohs scale hardness	4[1]