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Tiragalloite Mineral Data

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General Tiragalloite Information

Help on Chemical  Formula: Chemical Formula: Mn++4As+++++Si3O12(OH)
Help on Composition: Composition: Molecular Weight = 587.93 gm
   Manganese  37.38 %  Mn   48.26 % MnO
   Silicon    14.33 %  Si   30.66 % SiO2
   Arsenic    12.74 %  As   19.55 % As2O5
   Hydrogen    0.17 %  H     1.53 % H2O
   Oxygen     35.38 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+4AsSi3O12(OH)
Help on Environment: Environment: Veinlets cutting massive braunite and quartz.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Molinello, Chiavari, Val Graveglia, Liguria, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Paolo Tiragallo (1905-).
Help on Name Pronunciation: Name Pronunciation: Tiragalloite + Pronunciation Say TIRAGALLOITE
Help on Synonym: Synonym: ICSD 8188
  PDF 33-889

Tiragalloite Image

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Comments: Orange crystals of tiragalloite in matrix.
Location: Molinello Mine, Val Graveglia, Liguria, Italy. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Tiragalloite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3343:1:0.382
Help on Cell Dimensions: Cell Dimensions: a = 6.66, b = 19.92, c = 7.61, Z = 4; beta = 95.7° V = 1,004.61 Den(Calc)= 3.89
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.006(1), 3.267(0.71), 3.042(0.66),

Physical Properties of Tiragalloite

Help on Cleavage: Cleavage: {100} Good, {hk0} Parting
Help on Color: Color: Orange.
Help on Density: Density: 3.84
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Luster: Luster: Subadamantine
Help on Streak: Streak: white

Optical Properties of Tiragalloite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1933,KPDmeas= 0.1958,KC= 0.1957
Ncalc = 1.75 - 1.76
Help on Optical Data: Optical Data: Biaxial (+), a=1.745, b=1.751, g=1.76, bire=0.0150, 2V(Calc)=80, 2V(Meas)=38-46.

Calculated Properties of Tiragalloite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.66 gm/cc
note: Specific Gravity of Tiragalloite =3.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0068626588
Boson Index = 0.9931373412
Help on Photoelectric: Photoelectric: PETiragalloite = 18.92 barns/electron
U=PETiragalloite x rElectron Density= 69.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tiragalloite is Not Radioactive

Tiragalloite Classification

Help on  Dana Class: Dana Class: (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups
  (57.02)with [Si4O13] groups
  (57.02.01)Dana Group Tiragalloite Mn4AsSi3O12(OH) P 21/n 2/m
Help on  Strunz Class: Strunz Class: 09.BJ.25 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BJ -Sorosilicates with Si3O10, Si4O11, etc
09.BJ.25 Tiragalloite Mn4AsSi3O12(OH) P 21/n 2/m

Other Tiragalloite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tiragalloite :
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

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Dana No: Strunz No: 09.BJ.25





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