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Trigonite

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Långban, Filipstad, Värmland, Sweden
© Knut Eldjarn

Show Trigonite Photos (2)
Formula:
Pb
 
3
Mn
2+
 
[HAsO
 
3
|(AsO
 
3
)
 
2
]
System:MonoclinicColour:Yellow to yellow-brown, ...
Lustre:Adamantine, VitreousHardness:2 - 3
Name:From the Greek τρίγωυου, "trigonon", a triangle, alluding to its common crystal shape.
This page provides mineralogical data about Trigonite.

Classification of Trigonite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/J.03-30
Nickel-Strunz 10th (pending) edition ID:4.JB.40

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
Dana 8th edition ID:45.1.2.1

45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
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Type Occurrence of Trigonite

Type Locality:Långban, Filipstad, Värmland, Sweden
Place of Conservation of Type Material:Swedish Museum of Natural History, Stockholm, Sweden.
Year of Discovery:1920
Geological Setting of type material:Metamorphosed Fe-Mn ore body.
Associated Minerals at type locality:
RouseiteLeadHausmanniteFinnemaniteDolomite
DixeniteBaryte

Physical Properties of Trigonite

Lustre:Adamantine, Vitreous
Diaphaneity (Transparency):Translucent
Colour:Yellow to yellow-brown, dark brown or black; pale yellow to brownish yellow in transmitted light
Streak:Yellow
Hardness (Mohs):2 - 3
Cleavage:Perfect
On {010}, perfect; on {101}, good.
Fracture:Irregular/Uneven
Density (measured):6.1 - 7.1 g/cm3
Density (calculated):6.35 g/cm3

Crystallography of Trigonite

Crystal System:Monoclinic
Class (H-M):m - Domatic
Cell Parameters:a = 7.258Å, b = 6.822Å, c = 11.088Å
β = 91.45°
Ratio:a:b:c = 1.064 : 1 : 1.625
Unit Cell Volume:V 548.84 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals domatic with a trigonal outline from the development of numerous domatic forms including c _s, and _p; also complexly modified; thick tabular, flattened on {010}; subparallel growths.
Comment:Space Group: Pn

Optical Data of Trigonite

Type:Biaxial (-)
RI values: nα = 2.070 nβ = 2.100 nγ = 2.120
Maximum Birefringence:δ = 0.050

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r < v strong
Comments:2V = very large

Chemical Properties of Trigonite

Formula:
Pb
 
3
Mn
2+
 
[HAsO
 
3
|(AsO
 
3
)
 
2
]
Essential elements:As, H, Mn, O, Pb
All elements listed in formula:As, H, Mn, O, Pb

Relationship of Trigonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JB.05Fetiasite
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
[O
 
2
|As
 
2
O
 
5
]
4.JB.10Manganarsite
Mn
 
3
[(OH)
 
4
|As
 
2
O
 
4
]
4.JB.15Magnussonite
Mn
 
10
As
 
6
O
 
18
(OH,Cl)
 
2
4.JB.15UM1984-09-AsO:ClHMn
Mn
 
10
As
 
6
O
 
18
(OH)Cl
4.JB.20Armangite
Mn
2+
26
[CO
 
3
|(HAsO
 
3
)
 
4
|(AsO
 
3
)
 
14
]
4.JB.25Nanlingite
NaCa
 
6
(Mg,Fe,Li)
 
12
(AsO
 
3
)
 
2
[Fe(AsO
 
3
)
 
6
]F
 
14
·
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
[(AsO
 
3
)
 
3
|SiO
 
4
]
 
2
4.JB.35Stenhuggarite
CaFeSbO(AsO
 
3
)
 
2
4.JB.45Finnemanite
Pb
 
5
[Cl|(AsO
 
3
)
 
3
]
4.JB.50Gebhardite
Pb
 
8
[O|Cl
 
6
|(As
 
2
O
 
5
)
 
2
]
4.JB.55Derbylite
(Fe,Fe,Ti)
 
7
SbO
 
13
(OH)
4.JB.55Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
OH
4.JB.55Graeserite
(Fe
3+
 
,Ti)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.60Hemloite
(As,Sb)
 
2
(Ti,V,Fe,Al)
 
12
O
 
23
(OH)
4.JB.65Freedite
Pb
 
15
(Cu,Fe
2+
 
)
 
3
[O
 
7
|Cl
 
10
|(AsO
 
3
)
 
4
]
4.JB.70Georgiadèsite
Pb
 
16
[(OH)
 
6
|Cl
 
14
|(AsO
 
4
)
 
4
]
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(OH)
 
6
(AsO
 
3
)
 
6
[AsO
 
3
,HOSiO
 
3
]
 
2

Other Names for Trigonite

Other Languages:
German:Trigonit
Russian:Тригонит
Spanish:Trigonita

Other Information

Other Information:Soluble in dilute acids.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Trigonite

Reference List:Flink (1920) Geologiska Föeningens I Stockholm Förhandlinger: 42: 436-439.

American Mineralogist (1921): 6: 93-94.

Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 209.

Pertlik, F. (1978) The crystal structure of trigonite, Pb3Mn(AsO3)2(AsO2OH). Tschermaks Mineralogische und Petrographische Mitteilungen: 25: 95-105.

Pertlik, F. (1987) [Crystal structure refinement of trigonite, Pb3Mn(AsO3)2 AsO2OH), with a remark on errors in inorganic crystal structure databases.] Österreichische Akademie der Wissenschaften, Mathematisch-naturwissenschaftliche Klasse, Anzeiger, 124, 81–84 (in German).

Mineralogical Abstracts (1989): 40: 1661.

Welin, E. (1968) X-ray powder data for minerals from Långban and the related mineral deposits of Central Sweden. Arkiv Mineral. Geol., 4(30), 499–541.

Internet Links for Trigonite

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  • Raman and XRD data at RRUFF project
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  • Trigonite details from Handbook of Mineralogy (PDF)
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    Localities for Trigonite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Sweden
     
    • Värmland
      • Filipstad
    		Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm (1920) 42, 436; Rocks & Min.: 62:166; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1033; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 9th Nov 2009 13:19:55