Aldermanite

CategoryPhosphate minerals

Formula[Mg(H₂O)₆][Na(H₂O)₂Al₃(PO₄)₂(OH,F)₆ · H₂O

IMA symbolAdm^[1]

Crystal systemMonoclinic

Aldermanite
General
Category	Phosphate minerals
Formula	[Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6 · H2O
IMA symbol	Adm[1]
Crystal system	Monoclinic
Crystal class	2/m - Prismatic
Identification
Color	Colorless
Tenacity	Brittle
Mohs scale hardness	2
Luster	Sub-vitreous, pearly
Density	2.1 g cm−1 (calculated)
References	[2]

Aldermanite is a rare hydrated phosphate mineral with formula Mg₅Al₁₂(PO₄)₈(OH)₂₂·32H₂O.^[3][2][4] It is named after Arthur Richard Alderman (1901–1980), Professor of Geology and Mineralogy, University of Adelaide. Its type locality is Moculta Phosphate Quarry (Klemm's Quarry), Angaston, Barossa Valley, North Mount Lofty Ranges, Mount Lofty Ranges, South Australia, Australia.