Masutomilite Mineral Data

General Masutomilite Information

Chemical Formula:

K(Li,Al,Mn++)3[(Si,Al)4O10](F,OH)2

Composition:

Molecular Weight = 402.17 gm

Potassium 9.72 % K 11.71 % K₂O

Lithium 3.45 % Li 7.43 % Li₂O

Manganese 6.83 % Mn 8.82 % MnO

Aluminum 10.06 % Al 19.01 % Al₂O₃

Silicon 20.95 % Si 44.82 % SiO₂

Hydrogen 0.13 % H 1.12 % H₂O

Oxygen 41.77 % O

Fluorine 7.09 % F 7.09 % F

- % F -2.98 % -O=F₂

______ ______

100.00 % 97.02 % = TOTAL OXIDE

Empirical Formula:

KLi₂Al_0.5Mn²⁺_0.5Si₃AlO₁₀F_1.5(OH)_0.5

Environment:

Li pegmatites.

IMA Status:

Approved IMA 1975

Locality:

Tanakamiyama district, Shiga Prefecture, Honshu, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Kazunosuke Masutomi, Japanese pharmacist and prominent amateur mineralogist and mineral collector.

Name Pronunciation:

Masutomilite + Pronunciation

Masutomilite Image

Images:

Masutomilite

Comments: Transparent to translucent micaceous pale violet masutomilite with yellow iron stains.
Location: Hisu Kawa Mine, Gifu, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Masutomilite Crystallography

Axial Ratios:

a:b:c =0.5781:1:1.1089

Cell Dimensions:

a = 5.262, b = 9.102, c = 10.094, Z = 2; beta = 100.83° V = 474.84 Den(Calc)= 2.81

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): 3.32(1), 10.1(0.72), 3.35(0.65),

Crystal Structure:

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Brigatti M F , Mottana A , Malferrari D , Cibin G , American Mineralogist , 92 (2007) p.1395-1400, Crystal structure and chemical composition of Li-, Fe-, and Mn-rich micas, Locality: Sawtooth Mountains, Boise county, Idaho, USA, Sample: Boise

Physical Properties of Masutomilite

Cleavage:

{001} Perfect

Color:

Purple pink.

Density:

2.94

Diaphaneity:

Transparent to Translucent

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Masutomilite

Gladstone-Dale:

CI meas= 0.065 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1985,KPDmeas= 0.1897,KC= 0.2029
Ncalc = 1.57 - 1.6

Optical Data:

Biaxial (-), a=1.534, b=1.569, g=1.57, bire=0.0360, 2V(Calc)=18, 2V(Meas)=29-31. Dispersion r > v weak.

Pleochroism (y):

pale purple.

Pleochroism (z):

colorless.

Calculated Properties of Masutomilite

Electron Density:

Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Masutomilite =2.81 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Masutomilite= 3.88 barns/electron
U=PE_Masutomilite x r_electron= 10.68 barns/cc.

Radioactivity:

GRapi = 137.43 (Gamma Ray American Petroleum Institute Units)
Concentration of Masutomilite per GRapi unit = 0.73 (%)

Estimated Radioactivity from Masutomilite - barely detectable

Masutomilite Classification

Dana Class:

71.02.02b.12 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.02)with 2:1 Layers

(71.02.02b)Mica Group (Biotite subgroup)

71.02.02b.01 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

71.02.02b.01a Tetraferriphlogopite! KMg3FeSi3O10(OH)2 2/m

71.02.02b.01b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

71.02.02b.01c Fluorophlogopite! KMg3(AlSi3)O10F2 C 2/m 2/m

71.02.02b.02 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m

71.02.02b.03 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

71.02.02b.03a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

71.02.02b.04 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

71.02.02b.05 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

71.02.02b.05a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

71.02.02b.06 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

71.02.02b.07 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono

71.02.02b.08 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

71.02.02b.08a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

71.02.02b.08b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono

71.02.02b.09 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

71.02.02b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

71.02.02b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

71.02.02b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

71.02.02b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

71.02.02b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m

71.02.02b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

71.02.02b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.02.02b.18 Suhailite! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m

Strunz Class:

09.EC.20 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.20 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

09.EC.20 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m

09.EC.20 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

09.EC.20 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

09.EC.20 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

09.EC.20 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono

09.EC.20 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

09.EC.20 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

09.EC.20 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m

09.EC.20 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

09.EC.20 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

09.EC.20 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

09.EC.20 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

09.EC.20 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

09.EC.20 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

09.EC.20 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

09.EC.20 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

09.EC.20 Tetraferriannite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

09.EC.20 Tetraferriphlogopite! KMg3FeSi3O10(OH)2 2/m

09.EC.20 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

09.EC.20 Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono

09.EC.20 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

09.EC.20 Suhailite! (NH4)Fe3(Si3Al)O10(OH)2 C 2/m? 2/m

09.EC.20 Fluorophlogopite! KMg3(AlSi3)O10F2 C 2/m 2/m

Other Masutomilite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Masutomilite :
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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Print or Cut-and-Paste your Masutomilite Specimen Label here :

Masutomilite

K(Li,Al,Mn++)3[(Si,Al)4O10](F,OH)2
Dana No: 71.02.02b.12 Strunz No: 09.EC.20
Locality:

Notes: