Parsettensite Mineral Data

Parsettensite Mineral Data +

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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.

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

Diaphaniety:

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

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:

r_electron=2.51 gm/cc
note: r_{Parsettensite}=2.54 gm/cc.

Fermion Index

Fermion Index = 0.01086
Boson Index = 0.98914

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)

Estimated Radioactivity from Parsettensite - barely detectable

Parsettensite Classification

Dana Class:

74.1.3.1 (74)Phyllosilicate Modulated Layers

(74.1)with joined islands

(74.1.3)Dana Group

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

Strunz Class:

VIII/H.17-50 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.17 - Stilpnomelane series

VIII/H.17-10 Bannisterite KCa(Mn,Fe,Zn,Mg)21(Si,Al)32O76(OH)16·4-12(H2O) A2/a 2/m

VIII/H.17-20 Bariumbannisterite* (K,H3O)(Ba,Ca)(Mn,Fe,Mg)21(Si,Al)32O80(O,OH)16·4-12(H2O) Mono

VIII/H.17-30 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216·16(H2O) Unk (pseudo-HEX) Tri

VIII/H.17-40 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27·n(H2O) P1 1

VIII/H.17-45 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216·6(H2O) pseudo-HEX P1 or P1 Tri

VIII/H.17-50 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8·2(H2O)(?) C 2/m 2/m

VIII/H.17-60 Ganophyllite (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O) A2/a 2/m

VIII/H.17-70 Eggletonite Na2Mn8[Si11AlO29](OH)7·11(H2O) Ia or I2/a Mono

VIII/H.17-75 Tamaite! (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112·21(H2O) P 2₁/a 2/m

VIII/H.17-80 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2·2(H2O) Unk Ortho

Other Parsettensite Information

References:

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

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Parsettensite

(K,Na,Ca)(Mn,Al)7Si8O20(OH)8·2(H2O) (?)
Dana No: 74.1.3.1 Strunz No: VIII/H.17-50
Locality:

Notes: