Mineralogy Database

Trigonite Mineral Data

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General Trigonite Information

Help on Chemical  Formula: Chemical Formula: Pb3Mn(As+++O3)2(As+++O2OH)
Help on Composition: Composition: Molecular Weight = 1,046.31 gm
   Manganese   5.25 %  Mn    6.78 % MnO
   Arsenic    21.48 %  As   28.36 % As2O3
   Hydrogen    0.10 %  H     0.86 % H2O
   Lead       59.41 %  Pb   64.00 % PbO
   Oxygen     13.76 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb3Mn2+(AsO3)2(AsO2OH)
Help on Environment: Environment: In a metamorphosed Fe-Mn orebody.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1920
Help on Locality: Locality: Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for triangle, alluding to the characteristic crystal outline
Help on Name Pronunciation: Name Pronunciation: Trigonite + Pronunciation Say TRIGONITE
Help on Synonym: Synonym: ICSD 100410
  PDF 23-330
 

Trigonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0661:1:1.6279
Help on Cell Dimensions: Cell Dimensions: a = 7.25, b = 6.8, c = 11.07, Z = 2; beta = 91.817° V = 545.48 Den(Calc)= 6.37
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Pn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.99(1), 3.08(0.9), 3.24(0.7),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 0) ( 0 1 0) ( 1 0 1) ( 1 0 1) ( 1 0 0) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.

 

Physical Properties of Trigonite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Brown, Yellow, Yellow brown, Sulfur yellow.
Help on Density: Density: 6.1 - 7.1, Average = 6.6
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: yellow
 

Optical Properties of Trigonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1722,KPDmeas= 0.1662,KC= 0.1681
Ncalc = 2.03 - 2.19
Help on Optical Data: Optical Data: Biaxial (-), a=2.07, b=2.1, g=2.12, bire=0.0500
 

Calculated Properties of Trigonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.59 gm/cc
note: Specific Gravity of Trigonite =6.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PETrigonite =1,094.92 barns/electron
U=PETrigonite x rElectron Density=6,119.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Trigonite is Not Radioactive
 

Trigonite Classification

Help on  Dana Class: Dana Class: 45.01.02.01 (45)Acid and normal Antimonites, Arsenites and Phosphites
  (45.01)with miscellaneous formulae
  (45.01.02)Trigonite Group
 
45.01.02.01 Trigonite Pb3Mn(AsO3)2(AsO2OH) Pn m
 
45.01.02.02 Rouseite Pb2Mn(AsO3)2•2(H2O) P1,P 1 Tri
Help on  Strunz Class: Strunz Class: 04.JB.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O
 
04.JB.40 Trigonite Pb3Mn(AsO3)2(AsO2OH) Pn m
 

Other Trigonite Information

Help on References: References: NAME( AntBidBlaNic4) 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 Trigonite :
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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Print or Cut-and-Paste your Trigonite Specimen Label here :

Trigonite

Pb3Mn(As+++O3)2(As+++O2OH)
Dana No: 45.01.02.01 Strunz No: 04.JB.40
Locality:

 

Notes:

 

 
   
 


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