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 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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