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Trigonite

A valid IMA mineral species - grandfathered

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Photos of Trigonite (7)

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Trigonite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Trigonite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Trigonite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Trigonite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Trigonite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Trigonite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Trigonite

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

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About TrigoniteHide

Formula:

Pb₃Mn²⁺(AsO₃)₂(HAsO₃)

Colour:

Yellow to yellow-brown, dark brown or black; pale yellow to brownish yellow in transmitted light

Lustre:

Adamantine, Vitreous

Hardness:

2 - 3

Specific Gravity:

6.1 - 7.1

Crystal System:

Monoclinic

Name:

From the Greek τρίγωνον, "trigonon", a triangle, alluding to its common crystal shape.

Type Locality:

ⓘ Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

This page provides mineralogical data about Trigonite.

Unique IdentifiersHide

Mindat ID:

4016

Long-form identifier:

mindat:1:1:4016:3

GUID
(UUID V4):

7dc9ccaa-324f-4705-bec1-fb36f09b63c7

IMA Classification of TrigoniteHide

IMA status:

Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Pb₃Mn²⁺(AsO₃)₂(AsO₂OH)

First published:

1920

Classification of TrigoniteHide

Strunz-mindat (2024):

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 ed.:

45.1.2.1

45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Tgn	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of TrigoniteHide

Lustre:

Adamantine, Vitreous

Transparency:

Translucent

Colour:

Yellow to yellow-brown, dark brown or black; pale yellow to brownish yellow in transmitted light

Streak:

Yellow

Hardness:

2 - 3 on Mohs scale

Cleavage:

Perfect
On {010}, perfect; on {101}, good.

Fracture:

Irregular/Uneven

Density:

6.1 - 7.1 g/cm³ (Measured) 6.35 g/cm³ (Calculated)

Optical Data of TrigoniteHide

Type:

Biaxial (-)

RI values:

n_α = 2.070 n_β = 2.100 n_γ = 2.120

Max Birefringence:

δ = 0.050

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Very High

Dispersion:

r < v strong

Optical Extinction:

Y = b.

Comments:

2V = very large

Chemistry of TrigoniteHide

Mindat Formula:

Pb₃Mn²⁺(AsO₃)₂(HAsO₃)

Elements listed:

As, H, Mn, O, Pb - search for minerals with similar chemistry

Crystallography of TrigoniteHide

Crystal System:

Monoclinic

Class (H-M):

m - Domatic

Cell Parameters:

a = 7.258 Å, b = 6.822 Å, c = 11.088 Å
β = 91.45°

Ratio:

a:b:c = 1.064 : 1 : 1.625

Unit Cell V:

548.84 Å³ (Calculated from Unit Cell)

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

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0015671	Trigonite	Pertlik F (1978) The crystal structure of trigonite, Pb3Mn(AsO3)2(AsO2(OH)) Tschermaks Mineralogische und Petrographische Mitteilungen 25 95-105		1978	Langban, Varmland, Sweden	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Trigonite'
loop_
_publ_author_name
'Pertlik F'
_journal_name_full 'Tschermaks Mineralogische und Petrographische Mitteilungen'
_journal_volume 25 
_journal_year 1978
_journal_page_first 95
_journal_page_last 105
_publ_section_title
;
 The crystal structure of trigonite, Pb3Mn(AsO3)2(AsO2(OH))
;
_database_code_amcsd 0015671
_chemical_compound_source 'Langban, Varmland, Sweden'
_chemical_formula_sum 'Pb3 Mn As3 O9 H'
_cell_length_a 7.26
_cell_length_b 6.78
_cell_length_c 11.09
_cell_angle_alpha 90
_cell_angle_beta 91.5
_cell_angle_gamma 90
_cell_volume 545.694
_exptl_crystal_density_diffrn      6.368
_symmetry_space_group_name_H-M 'P 1 n 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,-y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Pb1   0.00000   0.12450   0.00000   0.01153
Pb2   0.19760   0.35230   0.29010   0.01153
Pb3   0.28520   0.27460   0.71360   0.01191
Mn   0.49480   0.01830   0.95560   0.00659
As1   0.21120   0.79570   0.72090   0.00773
As2   0.26620   0.88940   0.19510   0.00912
As3   0.42170   0.48680   0.01030   0.01115
O1   0.26900   0.99600   0.82500   0.01900
O2   0.43600   0.70300   0.67900   0.01520
O3   0.19500   0.94800   0.59200   0.01393
O4   0.20600   0.02800   0.32000   0.00507
O5   0.04600   0.82200   0.12400   0.00507
O6   0.28100   0.10100   0.09900   0.02406
O7   0.47300   0.33600   0.88500   0.01900
O8   0.00800   0.28900   0.45700   0.02153
O-H9   0.17500   0.54600   0.96700   0.02533
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Pb1 0.01001 0.01545 0.00925 -0.00101 0.00013 -0.00089
Pb2 0.01076 0.01000 0.01368 -0.00291 0.00051 0.00114
Pb3 0.00962 0.01203 0.01406 0.00203 0.00013 0.00152
Mn 0.00659 0.01039 0.00304 0.00025 -0.00089 0.00519
As1 0.00557 0.00975 0.00798 -0.00545 -0.00152 0.00228
As2 0.00608 0.00380 0.01748 0.00114 0.00228 0.00127
As3 0.01317 0.00519 0.01494 -0.00456 0.00456 -0.00190

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.99 Å	(100)
3.08 Å	(90)
3.24 Å	(70)
4.90 Å	(60)
4.50 Å	(40)
3.65 Å	(40)
2.76 Å	(40)

Comments:

Långban Mine, Sweden.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 7: Great Oxidation Event	<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]
47e : [Vanadates, chromates, manganates]

Type Occurrence of TrigoniteHide

Type Locality:

ⓘ Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Place of Conservation of Type Material:

Swedish Museum of Natural History, Stockholm, Sweden.

Geological Setting of Type Material:

Metamorphosed Fe-Mn ore body.

Associated Minerals at Type Locality:

Rouseite	Lead	Hausmannite	Finnemanite	Dolomite
Dixenite	Baryte

Other Language Names for TrigoniteHide

German:Trigonit

Russian:Тригонит

Spanish:Trigonita

Related Minerals - Strunz-mindat Grouping Hide

4.JB.	Cuyaite	Ca₂Mn³⁺As³⁺₁₄O₂₄Cl	Mon. m
4.JB.	Brattforsite	Mn₁₉(AsO ₃)₁₂Cl₂	Mon. 2/m : B2/b
4.JB.05	Fetiasite	(Fe³⁺,Fe²⁺,Ti)₃(As₂O₅)O₂	Mon. 2/m : P2₁/m
4.JB.10	Manganarsite	Mn₃(As₂O₄)(OH)₄	Trig.
4.JB.15	Magnussonite	Mn²⁺₁₀(As³⁺O₃)₆(OH,Cl)₂	Iso. m3m (4/m 3 2/m) : Ia3d
4.JB.15	UM1984-09-AsO:ClHMn	Mn₁₀As₆O₁₈(OH)Cl	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/acd
4.JB.20	Armangite	Mn²⁺₂₆(AsO₃)₁₄(HAsO₃)₄(CO₃)	Trig. 3 : P3
4.JB.25	Nanlingite	Na(Ca₅Li)Mg₁₂(AsO₃)₂[Fe(AsO₃)₆]F₁₄	Trig. 3m (3 2/m) : R3m
4.JB.30	Asbecasite	Ca₃(Ti,Sn⁴⁺)Be₂(AsO₃)₆(SiO₄)₂	Trig. 3m : P3c1
4.JB.35	Stenhuggarite	CaFeSb(AsO₃)₂O	Tet. 4/mmm (4/m 2/m 2/m) : I4₁/amd
4.JB.45	Finnemanite	Pb₅(AsO₃)₃Cl	Hex. 6/m : P6₃/m
4.JB.50	Gebhardite	Pb₈(As₂O₅)₂OCl₆	Mon. 2/m : P2₁/b
4.JB.55	Derbylite	Fe³⁺₄Ti₃Sb³⁺O₁₃(OH)	Mon. 2/m : P2₁/m
4.JB.55	Tomichite	(V,Fe)₄Ti₃AsO₁₃(OH)	Mon. 2/m : P2₁/m
4.JB.55	Graeserite	Fe³⁺₄Ti₃As³⁺O₁₃(OH)	Mon. 2/m : B2/m
4.JB.60	Hemloite	(Ti,V³⁺,Fe³⁺,Al)₁₂(As³⁺,Sb³⁺)₂O₂₃(OH)	Tric. 1 : P1
4.JB.65	Freedite	Cu⁺Pb₈(AsO₃)₂O₃Cl₅	Mon. 2/m : B2/m
4.JB.70	Georgiadesite	Pb₄(As³⁺O₃)Cl₄(OH)	Mon. 2/m : P2₁/b
4.JB.75	Ekatite	(Fe³⁺,Fe²⁺,Zn)₁₂(AsO₃)₆(AsO₃,HSiO₄)₂(OH)₆	Hex. 6mm : P6₃mc
4.JB.75	Szklaryite	◻Al₆BAs³⁺₃O₁₅	Orth. mmm (2/m 2/m 2/m) : Pbcm
4.JB.85	Lepageite	Mn²⁺₃(Fe³⁺₇Fe²⁺₄)O₃[Sb³⁺₅As³⁺₈O₃₄]	Tric. 1 : P1
4.JB.90	Bianchiniite	Ba₂(TiV)(As₂O₅)₂OF	Tet. 4/mmm (4/m 2/m 2/m) : I4/mcm

Other InformationHide

Notes:

Soluble in dilute acids.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for TrigoniteHide

mindat.org URL:

https://www.mindat.org/min-4016.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for TrigoniteHide

Reference List:

Flink, Gustaf (1920) Trigonit och Dixenit, två nya mineral från Långbanshytte gruvor. Geologiska Föreningen i Stockholm Förhandlingar, 42 (7) 436-452 doi:10.1080/11035892009444477

Wherry, E.T. (1921) New minerals. American Mineralogist, 6, 92-95 (93-94).

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

Welin, E. (1968) Notes on the mineralogy of Sweden 6. X-ray powder data for minerals from Långban and the related mineral deposits of Central Sweden. Arkiv för Mineralogi och Geologi, 4. 499-541

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.

(2023) Trigonite. Handbook of Mineralogy. Mineralogical Society of America

Localities for TrigoniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Sweden (TL)

Värmland County

Filipstad

Långban Ore District

ⓘ Långban Mine (TL)

Geologiska Föreningens I Stockholm. Förhandlinger (1920) +3 other references

Trigonite

About TrigoniteHide

Unique IdentifiersHide

IMA Classification of TrigoniteHide

Classification of TrigoniteHide

Mineral SymbolsHide

Physical Properties of TrigoniteHide

Optical Data of TrigoniteHide

Chemistry of TrigoniteHide

Crystallography of TrigoniteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of TrigoniteHide

Other Language Names for TrigoniteHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for TrigoniteHide

References for TrigoniteHide

Localities for TrigoniteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide