Trigonite (original) (raw)

A valid IMA mineral species - grandfathered

About TrigoniteHide

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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

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 IdentifiersHide

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Long-form identifier:

mindat:1:1:4016:3

7dc9ccaa-324f-4705-bec1-fb36f09b63c7

IMA Classification of TrigoniteHide

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

IMA Formula:

Pb3Mn2+(AsO3)2(AsO2OH)

Classification of TrigoniteHide

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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

45.1.2.1

45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous

Mineral SymbolsHide

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

Physical Properties of TrigoniteHide

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Colour:

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

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

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RI values:

_n_α = 2.070 _n_β = 2.100 _n_γ = 2.120

δ = 0.050

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

Optical Extinction:

Y = b.

Chemistry of TrigoniteHide

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Mindat Formula:

Pb3Mn2+(AsO3)2(HAsO3)

Crystallography of TrigoniteHide

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Crystal System:

Monoclinic

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 ų (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.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Långban Mine, Sweden.

Geological EnvironmentHide

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Type Occurrence of TrigoniteHide

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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 TrigoniteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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

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References for TrigoniteHide

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Localities for TrigoniteHide

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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

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- 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.