Mineralogy Database

Masutomilite Mineral Data

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General Masutomilite Information

Help on Chemical  Formula: Chemical Formula: K(Li,Al,Mn++)3[(Si,Al)4O10](F,OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: KLi2Al0.5Mn2+0.5Si3AlO10F1.5(OH)0.5
Help on Environment: Environment: Li pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Tanakamiyama district, Shiga Prefecture, Honshu, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kazunosuke Masutomi, Japanese pharmacist and prominent amateur mineralogist and mineral collector.
Help on Name Pronunciation: Name Pronunciation: Masutomilite + Pronunciation Say MASUTOMILITE
 

Masutomilite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.5781:1:1.1089
Help on Cell Dimensions: Cell Dimensions: a = 5.262, b = 9.102, c = 10.094, Z = 2; beta = 100.83° V = 474.84 Den(Calc)= 2.81
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.32(1), 10.1(0.72), 3.35(0.65),
 

Physical Properties of Masutomilite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Purple pink.
Help on Density: Density: 2.94
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Masutomilite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (y): Pleochroism (y): pale purple.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Masutomilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Masutomilite =2.81 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMasutomilite = 3.88 barns/electron
U=PEMasutomilite x relectron= 10.68 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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:

 

 
   
 


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