Trigonite Mineral Data

General Trigonite Information

Chemical Formula:

Pb3Mn(As+++O3)2(As+++O2OH)

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

Empirical Formula:

Pb₃Mn²⁺(AsO₃)₂(AsO₂OH)

Environment:

In a metamorphosed Fe-Mn orebody.

IMA Status:

Valid Species (Pre-IMA) 1920

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for triangle, alluding to the characteristic crystal outline

Name Pronunciation:

Trigonite + Pronunciation

Synonym:

ICSD 100410

PDF 23-330

Search for Trigonite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Trigonite Crystallography

Axial Ratios:

a:b:c =1.0661:1:1.6279

Cell Dimensions:

a = 7.25, b = 6.8, c = 11.07, Z = 2; beta = 91.817° V = 545.48 Den(Calc)= 6.37

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Pn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.99(1), 3.08(0.9), 3.24(0.7),

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 large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Pertlik F , Tschermaks Mineralogische und Petrographische Mitteilungen , 25 (1978) p.95-105, The crystal structure of trigonite, Pb3Mn(AsO3)2(AsO2(OH)), Locality: Langban, Varmland, Sweden

Physical Properties of Trigonite

Cleavage:

{010} Perfect

Color:

Brown, Yellow, Yellow brown, Sulfur yellow.

Density:

6.1 - 7.1, Average = 6.6

Diaphaneity:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Adamantine

Streak:

yellow

Optical Properties of Trigonite

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

Optical Data:

Biaxial (-), a=2.07, b=2.1, g=2.12, bire=0.0500

Calculated Properties of Trigonite

Electron Density:

Bulk Density (Electron Density)=5.59 gm/cc
note: Specific Gravity of Trigonite =6.60 gm/cc.

Fermion Index:

Fermion Index = 0.13
Boson Index = 0.87

Photoelectric:

PE_Trigonite=1,094.92 barns/electron
U=PE_Trigonite x rElectron Density=6,119.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Trigonite is Not Radioactive

Trigonite Classification

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

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Search for Trigonite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Trigonite :

A Bijoux Google Search for Trigonite
Adam's Minerals Google Search for Trigonite
Cape Minerals Google Search for Trigonite
Dakota Matrix Minerals Google Search for Trigonite
Excalibur Mineral Corp. Google Search for Trigonite
Exceptional Minerals Google Search for Trigonite
John Betts Fine Minerals Search for Trigonite
McDougall Minerals Google Search for Trigonite
Mineral News Website Link
Rock and Mineral Shows Google Search for Trigonite
Weinrich Minerals, Inc. Google Search for Trigonite

Ask about Trigonite 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 Español

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: