Trigonite Mineral Data

Trigonite Mineral Data +

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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)

IMA Status:

Valid Species (Pre-IMA) 1920

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 100410

PDF 23-330

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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),

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Crystal Structure:

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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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Trigonite

Electron Density:

r_electron=5.59 gm/cc
note: r_Trigonite=6.60 gm/cc.

Fermion Index

Fermion Index = 0.13136
Boson Index = 0.86864

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Trigonite is Not Radioactive

Trigonite Classification

Dana Class:

45.1.2.1 (45)Acid and normal Antimonites, Arsenites and Phosphites

(45.1)with miscellaneous formulae

(45.1.2)Dana Group

45.1.2.1 Trigonite Pb3Mn(AsO3)2(AsO2OH) Pn m

45.1.2.2 Rouseite Pb2Mn(AsO3)2·2(H2O) P1,P 1 Tri

Strunz Class:

IV/J.03-30 IV - Oxides

IV/J - Arsenides with [AsO3]3- groups

IV/J.03 - Finnemanite - Nealite series

IV/J.03-10 Finnemanite Pb5(AsO3)3Cl P 6₃ 6

IV/J.03-20 Freedite Pb8Cu(AsO3)2O3Cl5 C 2/m 2/m

IV/J.03-30 Trigonite Pb3Mn(AsO3)2(AsO2OH) Pn m

IV/J.03-40 Rouseite Pb2Mn(AsO3)2·2(H2O) P1,P 1 Tri

IV/J.03-50 Nealite Pb4Fe(AsO4)2Cl4 P1 1

Other Trigonite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Trigonite

Pb3Mn(As+++O3)2(As+++O2OH)
Dana No: 45.1.2.1 Strunz No: IV/J.03-30
Locality:

Notes: