Welinite (original) (raw)

A valid IMA mineral species

About WeliniteHide

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Formula:

Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6

Colour:

orange-red, deep red brown to reddish black

Name:

Named after Eric Welin (b. 1923- d. 2014), mineralogist and geochronologist, Swedish Museum of Natural History, Stockholm, Sweden

This page provides mineralogical data about Welinite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4264:8

e837e527-a916-4625-8e63-c5bd86c6d885

IMA Classification of WeliniteHide

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IMA Formula:

Mn2+6(W6+◻)(SiO4)2O4(OH)2

Type description reference:

Classification of WeliniteHide

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9.AF.75

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination

52.4.1.2

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination

17.10.30

17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate

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 WeliniteHide

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Colour:

Orange-red, deep red brown to reddish black

Streak:

Pale reddish brown

Cleavage:

Distinct/Good
Poor to distinct on {001}

Density:

4.47 g/cm3 (Measured) 4.41 g/cm3 (Calculated)

Optical Data of WeliniteHide

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RI values:

_n_ω = 1.864 _n_ε = 1.880

δ = 0.016

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

Comments:

anomalously biaxial

Chemistry of WeliniteHide

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Mindat Formula:

Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6

Common Impurities:

Fe,Sb,H2O

Crystallography of WeliniteHide

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Class (H-M):

3 - Pyramidal

Cell Parameters:

a = 8.155(7) Å, c = 4.785(5) Å

Unit Cell V:

275.59 ų (Calculated from Unit Cell)

Morphology:

As sections of crystals, to 2 cm.

Comment:

Originally assumed to be P63.

Crystal StructureHide

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CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of WeliniteHide

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General Appearance of Type Material:

as fillings in fissures with other minerals cutting hausmannite ore

Place of Conservation of Type Material:

Swedish Museum of Natural History, Stockholm, Sweden, 532157; National Museum of Natural History, Washington, D.C., USA, 120067.

Associated Minerals at Type Locality:

Reference:

Moore, P.B. (1967) Welinite, a new mineral from Lºangban. Arkiv Mineral. Geol., 4, 407{411

Synonyms of WeliniteHide

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Other Language Names for WeliniteHide

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Relationship of Welinite to other SpeciesHide

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Other Members of this group:

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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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 WeliniteHide

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References for WeliniteHide

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Reference List:

Dunn, Pete J., Peacor, Donald R., Erd, Richard C., Ramik, Robert A. (1986) Franciscanite and örebroite, two new minerals from California and Sweden, related to redefined welinite. American Mineralogist, 71 (11-12). 1522-1526

Localities for WeliniteHide

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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.