Wenkite (original) (raw)

A valid IMA mineral species

About WenkiteHide

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Formula:

(Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2O

Specific Gravity:

3.19 - 3.24

Name:

Named in honor of Eduard Jean Louis Wenk (4 November 1907, Basel, Switzerland - 19 October 2001, Basel, Switzerland), geologist, petrologist, mineralogist, and professor at the University of Basel. He created the basis for maps of mineral isograds in the Alps. From this work a book was written about the relationship between composition, crystal structure and optics of feldspar.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4269:3

ec930526-afdb-4e0d-8f5b-747ec2af1846

IMA Classification of WenkiteHide

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IMA Formula:

Ba4Ca6(Si,Al)20O41(OH)2(SO4)3 · H2O

Type description reference:

Classification of WenkiteHide

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9.GD.25

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
D : Chains of 6-membered rings – tabular zeolites

76.2.5.16

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species

17.10.28

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 WenkiteHide

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Comment:

Greasy on fractures

Cleavage:

Poor/Indistinct
prismatic

Parting:

pinacoidal parting

Density:

3.19 - 3.24 g/cm3 (Measured) 3.276 g/cm3 (Calculated)

Optical Data of WenkiteHide

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RI values:

_n_ω = 1.595 _n_ε = 1.589

δ = 0.006

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

Chemistry of WenkiteHide

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Mindat Formula:

(Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2O

Common Impurities:

Ti,Fe,Mn,Sr,Na,K,F,Cl

Crystallography of WenkiteHide

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Class (H-M):

6_m_2 - Ditrigonal Dipyramidal

Cell Parameters:

a = 13.44(7) Å, c = 7.59(13) Å

Unit Cell V:

1,187.33 ų (Calculated from Unit Cell)

Morphology:

Columnar crystals, to 5 cm.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of WenkiteHide

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Place of Conservation of Type Material:

Natural History Museum, Basel, Switzerland, MB14577.

Associated Minerals at Type Locality:

Reference:

Papageorgakis, J. (1962) Wenkit, ein neues Mineral von Candoglia. Schweizerische Mineralogische und Petrographische Mitteilungen: 42: 269-274.

Synonyms of WenkiteHide

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Other Language Names for WenkiteHide

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Relationship of Wenkite 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 WenkiteHide

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References for WenkiteHide

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Localities for WenkiteHide

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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.