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.

Name Pronunciation:

Strunzite + Pronunciation

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

Diaphaneity:

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= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2596,KPDmeas= 0.2663,KC= 0.267
Ncalc = 1.66 - 1.69

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:

Bulk Density (Electron Density)=2.51 gm/cc
note: Specific Gravity of Strunzite =2.52 gm/cc.

Fermion Index:

Fermion Index = 0.0049989957
Boson Index = 0.9950010043

Photoelectric:

PE_Strunzite= 9.93 barns/electron
U=PE_Strunzite x rElectron Density= 24.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Strunzite is Not Radioactive

Strunzite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.09)Strunzite Group

42.11.09.01 Strunzite MnFe2(PO4)2(OH)2•6(H2O) P1 1

42.11.09.02 Ferrostrunzite FeFe2(PO4)2(OH)2•6(H2O) P 1,P1 Tri

42.11.09.03 Ferristrunzite FeFe2(PO4)2(OH)3•5(H2O) P1,P 1 Tri

Strunz Class:

08.DC.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

08.DC.25 Ferrostrunzite FeFe2(PO4)2(OH)2•6(H2O) P 1,P1 Tri

08.DC.25 Ferristrunzite FeFe2(PO4)2(OH)3•5(H2O) P1,P 1 Tri

08.DC.25 Metavauxite FeAl2(PO4)2(OH)2•8(H2O) P 2₁/c 2/m

08.DC.25 Strunzite MnFe2(PO4)2(OH)2•6(H2O) P1 1

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 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Strunzite here :
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Print or Cut-and-Paste your Strunzite Specimen Label here :

Strunzite

Mn++Fe+++2(PO4)2(OH)2•6(H2O)
Dana No: 42.11.09.01 Strunz No: 08.DC.25
Locality:

Notes: