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 % K2 O
Lithium 3.45 % Li 7.43 % Li2 O
Manganese 6.83 % Mn 8.82 % MnO
Aluminum 10.06 % Al 19.01 % Al2 O3
Silicon 20.95 % Si 44.82 % SiO2
Hydrogen 0.13 % H 1.12 % H2 O
Oxygen 41.77 % O
Fluorine 7.09 % F 7.09 % F
- %
F -2.98 % -O=F2
______ ______
100.00 % 97.02 % = TOTAL OXIDE
Empirical Formula:
KLi2 Al0.5 Mn2+ 0.5 Si3 AlO10 F1.5 (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 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 - Prismatic H-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io ): 3.32(1), 10.1(0.72), 3.35(0.65),
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:
PEMasutomilite = 3.88 barns/electronU=PEMasutomilite 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
Search for Masutomilite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Masutomilite :
Ask about Masutomilite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espa�ol
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:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.