Masutomilite Mineral Data + Say MASUTOMILITE

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.
 

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 - PrismaticH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.75 gm/cc
note: rMasutomilite =2.81 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01258
Boson Index = 0.98742
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)

Estimated Radioactivity from Masutomilite - barely detectable

 

Masutomilite Classification
Help on Dana Class: Dana Class: 71.2.2b.12 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.2)with 2:1 Layers
  (71.2.2b)Mica Group (Biotite subgroup)
 
71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
 
71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m
 
71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
 
71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m
 
71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
 
71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m
 
71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
 
71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m
 
71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m
 
71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
 
71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono
 
71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
 
71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
 
71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono
 
71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m
 
71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
 
71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
 
71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
 
71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
 
71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m
 
71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
 
71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
 
71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/H.11-60 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups
  VIII/H.11 - Mica group, Biotite series
 
VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m
 
VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m
 
VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m
 
VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m
 
VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m
 
VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m
 
VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m
 
VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m
 
VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m
 
VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m
 
VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m
 
VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m
 
VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m
 
VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m
 
VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m
 
VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m
 
VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m
 
VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m
 
VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m
 
VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Masutomilite

K(Li,Al,Mn++)3[(Si,Al)4O10](F,OH)2
Dana No: 71.2.2b.12 Strunz No: VIII/H.11-60
Locality:

 

Notes:

 
 
   
 
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