Zussmanite Mineral Data

General Zussmanite Information

Chemical Formula:

K(Fe++,Mg,Mn)13[AlSi17O42](OH)14

Composition:

Molecular Weight = 2,147.17 gm

Potassium 1.82 % K 2.19 % K₂O

Magnesium 1.13 % Mg 1.88 % MgO

Manganese 2.56 % Mn 3.30 % MnO

Aluminum 1.26 % Al 2.37 % Al₂O₃

Iron 28.61 % Fe 36.81 % FeO

Silicon 22.24 % Si 47.57 % SiO₂

Hydrogen 0.66 % H 5.87 % H₂O

Oxygen 41.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KFe²⁺₁₁MgMn²⁺AlSi₁₇O₄₂(OH)₁₄

Environment:

Blue schist facies metamorphic rocks.

IMA Status:

Approved IMA 1964

Locality:

Laytonville quarry, 5 miles south of Laytonville, Mendocino Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for Jack Zussman (1924-), crystallographer and emeritus professor of geology, Manchester University, England.

Name Pronunciation:

Zussmanite + Pronunciation

Synonym:

ICSD 23570

PDF 19-1500

Zussmanite Image

Images:

Zussmanite

Comments: Light to dark green crystals of zussmanite (.75 mm) embedded in schist..
Location: Longvale quarry, Mendocino Co., California, USA. Scale: Picture Size 2 cm.
© Tom Loomis / Dakota Matrix

Zussmanite Crystallography

Axial Ratios:

a:c = 1:2.46248

Cell Dimensions:

a = 11.65, c = 28.688, Z = 3; V = 3,371.96 Den(Calc)= 3.17

Crystal System:

Trigonal - Pyramidal H-M Symbol (3) Space Group: R 3

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

By Intensity(I/I_o): 9.6(1), 4.78(0.45), 3.19(0.25),

Physical Properties of Zussmanite

Cleavage:

{0001} Perfect

Color:

Light green.

Density:

3.146

Diaphaneity:

Translucent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Zussmanite

Dichroism (e):

colorless.

Dichroism (w):

pale green.

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1997,KPDmeas= 0.2012,KC= 0.2076
Ncalc = 1.65 - 1.66

Optical Data:

Uniaxial (-), e=1.623, w=1.643, bire=0.0200.

Calculated Properties of Zussmanite

Electron Density:

Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Zussmanite =3.15 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Zussmanite= 10.23 barns/electron
U=PE_Zussmanite x r_electron= 31.62 barns/cc.

Radioactivity:

GRapi = 25.83 (Gamma Ray American Petroleum Institute Units)
Concentration of Zussmanite per GRapi unit = 3.87 (%)

Estimated Radioactivity from Zussmanite - barely detectable

Zussmanite Classification

Dana Class:

74.01.04.01 (74)Phyllosilicate Modulated Layers

(74.01)with joined islands

(74.01.04)Dana Group

74.01.04.01 Zussmanite K(Fe,Mg,Mn)13[AlSi17O42](OH)14 R 3 3

74.01.04.02 Coombsite! K(Mn,Fe,Mg)13(Si,Al)18O42(OH)14 R 3 or R 3 Trig

Strunz Class:

09.EG.35 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EG -Double nets with 6-membered and larger rings

09.EG.35 Coombsite! K(Mn,Fe,Mg)13(Si,Al)18O42(OH)14 R 3 or R 3 Trig

09.EG.35 Zussmanite K(Fe,Mg,Mn)13[AlSi17O42](OH)14 R 3 3

Other Zussmanite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Zussmanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Zussmanite Specimen Label here :

Zussmanite

K(Fe++,Mg,Mn)13[AlSi17O42](OH)14
Dana No: 74.01.04.01 Strunz No: 09.EG.35
Locality:

Notes:

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