Strunzite

Strunzite (Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂{{·}}6H₂O) is a light yellow mineral of the strunzite group, first discovered in 1957.[4]

Strunzite
Strunzite from Bavaria, Germany
General
Category	Mineral
Formula (repeating unit)	Mn^2+Fe^3+2(PO4)2(OH)2 · 6H2O[1]
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[2]
Identification
Color	Straw yellow to brownish yellow
Crystal habit	Acicular[3]
Mohs scale hardness	4
Luster	vitreous
Streak	white
Specific gravity	2.52
Density	2.52 g/cm^3
Pleochroism	Weak
References	[4][5]

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.[4]

It is named after Hugo Strunz, a Professor of Mineralogy at Technical University, Berlin.[6]

References

1. "Strunzite R050619". RRUFF. Retrieved 8 April 2020.
2. "Strunzite Mn2+Fe3+2(PO4)2(OH)2•6H2O" (PDF). Handbook of Mineralogy. Retrieved 8 April 2020.
3. "General Strunzite Information". WebMineral. Retrieved 8 April 2020.
4. "Strunzite". Mindat.org. Retrieved 8 April 2020.
5. Grey, I. E.; Macrae, C. M.; Keck, E.; Birch, W. D. (October 2012). "Aluminium-bearing strunzite derived from jahnsite at the Hagendorf-Süd pegmatite, Germany". Mineralogical Magazine. 76 (5): 1165–1174. doi:10.1180/minmag.2012.076.5.08.
6. "Strunzite". Dakota Matrix Minerals. Retrieved 8 April 2020.