Trigonite
A valid IMA mineral species - grandfathered
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About Trigonite
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.
This page provides mineralogical data about Trigonite.
Unique Identifiers
Mindat ID:
4016
Long-form identifier:
mindat:1:1:4016:3
Similar Names
| Dragonite | A variety of Quartz | SiO2 |
| Drakonite | A synonym of 'Drakontite' | |
| Terriconite | (NH4)Fe3+(SO4)2 | |
| Trimonite | A synonym of Scheelite | |
| Turquonite | A synonym of 'Turquenite' |
IMA Classification of Trigonite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Pb2+3Mn2+(As3+O3)2(As3+O2OH)
First published:
1920
Classification of Trigonite
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
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
45.1.2.1
45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| 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 Trigonite
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.
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 Trigonite
Type:
Biaxial (-)
RI values:
nα = 2.07 nβ = 2.1 nγ = 2.12
Max. Birefringence:
δ = 0.050
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
r < v strong
Optical Extinction:
Y = b.
Comments:
2V = very large
Chemistry of Trigonite
Mindat Formula:
Pb3Mn2+(AsO3)2(HAsO3)
Element Weights:
Crystallography of Trigonite
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°
β = 91.45°
Ratio:
a:b:c = 1.064 : 1 : 1.625
Unit Cell 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
Crystal Structure
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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
X-Ray Powder Diffraction
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 Environment
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 Trigonite
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:
Other Language Names for Trigonite
Common Associates
Associations Based on Photo Data:
| 1 photo of Trigonite associated with Magnussonite | Mn2+10(As3+O3)6(OH,Cl)2 |
Related Minerals - Strunz-mindat Grouping
| 4.JB. | Cuyaite | Ca2Mn3+As3+14O24Cl |
| 4.JB. | Brattforsite | Mn19(AsO 3)12Cl2 |
| 4.JB.05 | Fetiasite | (Fe3+,Fe2+,Ti)3(As2O5)O2 |
| 4.JB.10 | Manganarsite | Mn3(As2O4)(OH)4 |
| 4.JB.15 | 'UM1984-09-AsO:ClHMn' | Mn10As6O18(OH)Cl |
| 4.JB.15 | Magnussonite | Mn2+10(As3+O3)6(OH,Cl)2 |
| 4.JB.20 | Armangite | Mn2+26(AsO3)14(HAsO3)4(CO3) |
| 4.JB.25 | Nanlingite | Na(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14 |
| 4.JB.30 | Asbecasite | Ca3(Ti,Sn4+)Be2(AsO3)6(SiO4)2 |
| 4.JB.35 | Stenhuggarite | CaFeSb(AsO3)2O |
| 4.JB.45 | Finnemanite | Pb5(AsO3)3Cl |
| 4.JB.50 | Gebhardite | Pb8(As2O5)2OCl6 |
| 4.JB.55 | Graeserite | Fe3+4Ti3As3+O13(OH) |
| 4.JB.55 | Tomichite | (V,Fe)4Ti3AsO13(OH) |
| 4.JB.55 | Derbylite | Fe3+4Ti3Sb3+O13(OH) |
| 4.JB.60 | Hemloite | (Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH) |
| 4.JB.65 | Freedite | Cu+Pb8(AsO3)2O3Cl5 |
| 4.JB.70 | Georgiadesite | Pb4(As3+O3)Cl4(OH) |
| 4.JB.75 | Szklaryite | ◻Al6BAs3+3O15 |
| 4.JB.75 | Ekatite | (Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6 |
| 4.JB.85 | Lepageite | Mn2+3(Fe3+7Fe2+4)O3[Sb3+5As3+8O34] |
| 4.JB.90 | Bianchiniite | Ba2(TiV)(As2O5)2OF |
Other Information
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 Trigonite
mindat.org URL:
https://www.mindat.org/min-4016.html
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References for Trigonite
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
Localities for Trigonite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Sweden (TL) | |
| Flink (1920) +2 other references |
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Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden