Parsettensite Mineral Data

General Parsettensite Information

Chemical Formula:

(K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O) (?)

Composition:

Molecular Weight = 1,150.86 gm

Potassium 0.68 % K 0.82 % K₂O

Sodium 0.60 % Na 0.81 % Na₂O

Calcium 4.18 % Ca 5.85 % CaO

Magnesium 1.48 % Mg 2.45 % MgO

Manganese 25.78 % Mn 33.28 % MnO

Aluminum 2.34 % Al 4.43 % Al₂O₃

Silicon 19.52 % Si 41.77 % SiO₂

Hydrogen 1.35 % H 12.05 % H₂O

Oxygen 44.07 % O

______ ______

100.00 % 101.46 % = TOTAL OXIDE

Empirical Formula:

Ca_1.2Na_0.3K_0.2Mn²⁺_5.4AlMg_0.7Si₈O₂₀(OH)₈·3.7(H₂O)

Environment:

Manganese deposits.

IMA Status:

Valid Species (Pre-IMA) 1923

Locality:

Parsettens Alp, Val d'Err, Grisons, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Parsettensite + Pronunciation

Synonym:

ICSD 75286

PDF 44-1443

Parsettensite Image

Images:

Parsettensite

Comments: Yellowish brown microcrystals of parsettensite on a crystalline matrix with pyrite and apatite.
Location: Foote mine, Cleveland County, North Carolina, USA. Scale: Picture size 1 cm.
© John Veevaert

Parsettensite Crystallography

Axial Ratios:

a:b:c =1.7326:1:0.6422

Cell Dimensions:

a = 39.47, b = 22.78, c = 14.63, Z = 15; beta = 120.8° V = 11,298.95 Den(Calc)= 2.54

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.639(1), 1.628(0.7), 2.791(0.7),

Crystal Structure:

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Eggleton R A , Guggenheim S , American Mineralogist , 79 (1994) p.426-437, The use of electron optical methods to determine the crystal structure of a, modulated phyllosilicate: Parsettensite

Physical Properties of Parsettensite

Cleavage:

{001} Perfect

Color:

Copper red.

Density:

2.59

Diaphaneity:

Translucent to subtranslucent

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Habit:

Micaceous - Platy texture with "flexible" plates.

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Vitreous (Glassy)

Streak:

brownish yellow

Optical Properties of Parsettensite

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2228,KPDmeas= 0.2185,KC= 0.2229
Ncalc = 1.57 - 1.58

Optical Data:

Biaxial (+/-), a=1.546, b=1.576, g=1.576, bire=0.0300, 2V(Calc)=0, 2V(Meas)=0-8.

Calculated Properties of Parsettensite

Electron Density:

Bulk Density (Electron Density)=2.51 gm/cc
note: Specific Gravity of Parsettensite =2.54 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Parsettensite}= 7.93 barns/electron
U=PE_{Parsettensite} x r_electron= 19.89 barns/cc.

Radioactivity:

GRapi = 9.69 (Gamma Ray American Petroleum Institute Units)
Concentration of Parsettensite per GRapi unit = 10.32 (%)

Estimated Radioactivity from Parsettensite - barely detectable

Parsettensite Classification

Dana Class:

74.01.03.01 (74)Phyllosilicate Modulated Layers

(74.01)with joined islands

(74.01.03)Dana Group

74.01.03.01 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O)(?) C 2/m 2/m

74.01.03.02 Armbrusterite! K5Na6MnMn14[Si9O22]4(OH)10•4H2O C 2/m 2/m

Strunz Class:

09.EG.40 09 - SILICATES (Germanates)

09.E - Phyllosilicates

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

09.EG.40 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216•6(H2O) pseudo-HEX P1 or P1 Tri

09.EG.40 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2•2(H2O) Unk Ortho

09.EG.40 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216•16(H2O) Unk (pseudo-HEX) Tri

09.EG.40 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O)(?) C 2/m 2/m

09.EG.40 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27•n(H2O) P1 1

Other Parsettensite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Parsettensite :
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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Ask about Parsettensite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Parsettensite

(K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O) (?)
Dana No: 74.01.03.01 Strunz No: 09.EG.40
Locality:

Notes: