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Parsettensite Mineral Data

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General Parsettensite Information

Help on Chemical  Formula: Chemical Formula: (K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O) (?)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca1.2Na0.3K0.2Mn2+5.4AlMg0.7Si8O20(OH)8�3.7(H2O)
Help on Environment: Environment: Manganese deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1923
Help on Locality: Locality: Parsettens Alp, Val d'Err, Grisons, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Parsettensite + Pronunciation Say PARSETTENSITE
Help on Synonym: Synonym: ICSD 75286
  PDF 44-1443

Parsettensite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.7326:1:0.6422
Help on Cell Dimensions: Cell Dimensions: a = 39.47, b = 22.78, c = 14.63, Z = 15; beta = 120.8° V = 11,298.95 Den(Calc)= 2.54
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.639(1), 1.628(0.7), 2.791(0.7),

Physical Properties of Parsettensite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Copper red.
Help on Density: Density: 2.59
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Hardness: Hardness: 1.5 - Between Talc and Gypsum
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brownish yellow

Optical Properties of Parsettensite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.51 gm/cc
note: Specific Gravity of Parsettensite =2.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEParsettensite = 7.93 barns/electron
U=PEParsettensite x relectron= 19.89 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (74)Phyllosilicate Modulated Layers
  (74.01)with joined islands
  (74.01.03)Dana Group Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O)(?) C 2/m 2/m Armbrusterite! K5Na6MnMn14[Si9O22]4(OH)10•4H2O C 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: 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

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


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





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