Strunzite Mineral Data

Strunzite Mineral Data +

General Strunzite Information

Chemical Formula:

Mn++Fe+++2(PO4)2(OH)2·6(H2O)

Composition:

Molecular Weight = 498.68 gm

Manganese 11.02 % Mn 14.23 % MnO

Iron 22.40 % Fe 32.02 % Fe₂O₃

Phosphorus 12.42 % P 28.46 % P₂O₅

Hydrogen 2.83 % H 25.29 % H₂O

Oxygen 51.33 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂·6(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1958

Locality:

Hangedor Pegmatite, Oberfalz, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Hugo Strunz (1910-), mineralogist, Berlin, who authored the Strunz system of mineral classification.

Synonym:

ICSD 100409

PDF 11-133

Strunzite Image

Images:

Strunzite

Comments: Acicular, stellate sprays of strunzite crystals on matrix.
Location: Palermo #1 mine, North Groton, Grafton County, New Hampshire, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Strunzite Crystallography

Axial Ratios:

a:b:c =1.0397:1:0.7404

Cell Dimensions:

a = 10.228, b = 9.837, c = 7.284, Z = 2; alpha = 90.17°, beta = 98.44°, gamma = 117.44° V = 643.37 Den(Calc)= 2.57

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.02(1), 5.32(0.8), 4.35(0.6),

Crystal Structure:

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Fanfani L , Tomassini M , Zanazzi P F , Zanzari A R , Tschermaks Mineralogische und Petrographische Mitteilungen , 25 (1978) p.77-87, The crystal structure of strunzite, a contribution to the, crystal chemistry of basic ferric-manganous hydrated phosphates, Locality: Big Chief mine, Glendale, South Dakota

Physical Properties of Strunzite

Cleavage:

[???] Good

Color:

Brownish yellow, Golden yellow, Straw yellow.

Density:

2.47 - 2.56, Average = 2.51

Diaphaniety:

Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Strunzite

Gladstone-Dale:

CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2606,KPDmeas= 0.2663,KC= 0.267

Optical Data:

Biaxial (-), a=1.619, b=1.67, g=1.72, bire=0.1010, 2V(Calc)=86, 2V(Meas)=75-80.

Pleochroism (x):

pale yellow.

Pleochroism (y):

pale yellow.

Pleochroism (z):

yellow.

Calculated Properties of Strunzite

Electron Density:

r_electron=2.51 gm/cc
note: r_Strunzite=2.52 gm/cc.

Fermion Index

Fermion Index = 0.00499
Boson Index = 0.99501

Photoelectric:

PE_Strunzite= 9.93 barns/electron
U=PE_Strunzite x r_electron= 24.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Strunzite is Not Radioactive

Strunzite Classification

Dana Class:

42.11.9.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.9)Dana Group

42.11.9.1 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

42.11.9.2 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

42.11.9.3 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

Strunz Class:

VII/D.11-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

Other Strunzite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Strunzite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Strunzite

Mn++Fe+++2(PO4)2(OH)2·6(H2O)
Dana No: 42.11.9.1 Strunz No: VII/D.11-20
Locality:

Notes: