Strunzite

Strunzite (Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂ · 6H₂O) is a light yellow mineral of the strunzite group, first discovered in 1957.^[5]

Strunzite
Strunzite from Bavaria, Germany
General
Category	Minerals
Formula	Mn2+Fe3+2(PO4)2(OH)2 · 6H2O[1]
IMA symbol	Snz[2]
Strunz classification	8.DC.25
Crystal system	Triclinic
Space group	P1 (no. 2)
Unit cell	a = 10.228(5) [Å], b = 9.837(5) [Å] c = 7.284(5) [Å]; α = 90.17(5)° β = 98.44(5)° γ = 117.44(5)°; Z = 2[3]
Identification
Color	Straw yellow to brownish yellow
Crystal habit	Acicular[4]
Mohs scale hardness	4
Luster	vitreous
Streak	white
Specific gravity	2.52
Density	2.52 g/cm3
Pleochroism	Weak
References	[5][6]

It crystallizes in the triclinic system and has a light, vitreous luster, a specific gravity of 2.52 and a Mohs hardness of 4. Associated minerals include beraunite, quartz and strengite.^[5]

It is named after Hugo Strunz, a Professor of Mineralogy at Technische Universität Berlin.^[7]