Kinoshitalite Mineral Data

Kinoshitalite Mineral Data +

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General Kinoshitalite Information

Chemical Formula:

(Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2

Composition:

Molecular Weight = 485.68 gm

Potassium 3.22 % K 3.88 % K₂O

Barium 16.96 % Ba 18.94 % BaO

Sodium 0.47 % Na 0.64 % Na₂O

Magnesium 10.51 % Mg 17.43 % MgO

Manganese 5.66 % Mn 7.30 % MnO

Aluminum 11.67 % Al 22.04 % Al₂O₃

Silicon 11.57 % Si 24.74 % SiO₂

Hydrogen 0.42 % H 3.71 % H₂O

Oxygen 39.53 % O

______ ______

100.00 % 98.68 % = TOTAL OXIDE

Empirical Formula:

Ba_0.6K_0.4Na_0.1Mg_2.1Mn²⁺_0.5Al_0.2Si₂Al_1.9O₁₀(OH)₂

Environment:

In hausmannite-tephroite ore.

IMA Status:

Approved IMA 1973

Locality:

In the Noda-Tanagawa mine, Iwate Prefeture, and at Hokkejino, Kyoto Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Dr. Kameki Kinshita (1896-1974), investigator of ore deposits in Japan.

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Kinoshitalite Crystallography

Axial Ratios:

a:b:c =0.5778:1:1.1081

Cell Dimensions:

a = 5.345, b = 9.25, c = 10.25, Z = 2; beta = 99.99° V = 499.09 Den(Calc)= 3.23

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): 3.37(1), 2.02(0.55), 2.52(0.55),

Crystal Structure:

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Gnos E , Armbruster T , American Mineralogist , 85 (2000) p.242-250, Kinoshitalite, Ba(Mg)3(Al2Si2)O10(OH,F)2, a brittle mica from a manganese, deposit in Oman: Paragenesis and crystal chemistry

View Additional jPOWD Structure files for Kinoshitalite
[1] [2]

Physical Properties of Kinoshitalite

Cleavage:

[001] Perfect

Color:

Yellow brown, Colorless.

Density:

3.3

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Scaly - Morphology like fish scales.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous (Glassy)

Streak:

yellow white

Optical Properties of Kinoshitalite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1945,KPDmeas= 0.1904,KC= 0.192

Optical Data:

Biaxial (-), a=1.619, b=1.628-1.633, g=1.635, bire=0.0160, 2V(Calc)=40-82, 2V(Meas)=23.

Pleochroism (x):

very light yellow.

Pleochroism (y):

light brownish yellow.

Pleochroism (z):

light brownish yellow.

Calculated Properties of Kinoshitalite

Electron Density:

r_electron=3.17 gm/cc
note: r_{Kinoshitalite}=3.30 gm/cc.

Fermion Index

Fermion Index = 0.04633
Boson Index = 0.95367

Photoelectric:

PE_{Kinoshitalite}= 73.64 barns/electron
U=PE_{Kinoshitalite} x r_electron= 233.45 barns/cc.

Radioactivity:

GRapi = 44.65 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Kinoshitalite - barely detectable

Kinoshitalite Classification

Dana Class:

71.2.2c.5 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2c)Mica Group (Margarite subgroup)

71.2.2c.1 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2c.2 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m

71.2.2c.3 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m

71.2.2c.4 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m

71.2.2c.5 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m

71.2.2c.6 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m

71.2.2c.7 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

71.2.2c.8 IMA2004-013! (Ba,K)(Mg,Fe,Ti)3(Si,Al)4O10O2 C 2/m 2/m

Strunz Class:

VIII/H.12-30 VIII - Silicates

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

VIII/H.12 - Mica group, Lepidolite series

VIII/H.12-10 Anandite (Ba,K)(Fe,Mg)3(Si,Al,Fe)4O10(S,OH)2 C 2/m 2/m

VIII/H.12-20 Bityite CaLiAl2(AlBeSi2)O10(OH)2 C 2/c 2/m

VIII/H.12-30 Kinoshitalite (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2 C 2/m 2/m

VIII/H.12-35 Ferrokinoshitalite! (Ba,K)(Fe,Mg)3(Si2Al2)O10(OH,F)2 C 2/m 2/m

VIII/H.12-40 Margarite CaAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.12-50 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

VIII/H.12-60 Clintonite Ca(Mg,Al)3(Al3Si)O10(OH)2 C 2/m 2/m

Other Kinoshitalite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Kinoshitalite

(Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2
Dana No: 71.2.2c.5 Strunz No: VIII/H.12-30
Locality:

Notes: