Steinmetzite

Steinmetzite is a very rare phosphate mineral with formula Zn₂Fe(PO₄)₂(OH)•3H₂O. It was discovered among pegmatites of Hagendorf in Germany,^[2][3] that are famous for rare phosphate minerals.^[4] Steinmetzite is chemically related to phosphophyllite and other zinc iron phosphates, namely plimerite and zinclipscombite.^[5][6]

Steinmetzite
General
Category	Phosphate mineral
Formula	Zn2Fe(PO4)2(OH)•3H2O
IMA symbol	Snm[1]
Crystal system	Triclinic
Crystal class	Pinacoidal (1) (same H-M symbol)
Space group	P1
Identification
References	[2][3]