Flörkeite (original) (raw)

A valid IMA mineral species

About FlörkeiteHide

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Formula:

(K3Ca2Na)[Al8Si8O32] · 12H2O

Specific Gravity:

2.270 (Calculated)

Name:

In honour of the German mineralogist and crystallographer Otto Wilhelm Flörke (02 August 1926, Gießen, Germany - 28 July 2021, Witten, Germany) and his leading contributions to microstructure, crystal-chemistry and structural state of the silica polymorphs.

Zeolite Group.

A distinctly triclinic zeolite, closely related to phillipsite (monoclinic). The triclinic distortion is caused by Al-Si ordering in the crystal structure.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:38900:0

7194a445-8410-4e99-abca-7625b0dd622f

IMA Classification of FlörkeiteHide

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Classification of FlörkeiteHide

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9.GC.10

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
C : Chains of doubly-connected 4-membered rings

77.1.10.5

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites

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 FlörkeiteHide

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Cleavage:

Poor/Indistinct
Indistinct cleavage on {001}.

Fracture:

Irregular/Uneven

Density:

2.270 g/cm3 (Calculated)

Optical Data of FlörkeiteHide

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RI values:

_n_α = 1.506(2) _n_β = 1.514(2) _n_γ = 1.518(2)

2V:

Measured: 71.0° (5), Calculated: 70.2°

δ = 0.012

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

Pleochroism:

Non-pleochroic

Chemistry of FlörkeiteHide

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Mindat Formula:

(K3Ca2Na)[Al8Si8O32] · 12H2O

Crystallography of FlörkeiteHide

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Class (H-M):

1 - Pinacoidal

Cell Parameters:

a = 19.965 Å, b = 14.271 Å, c = 8.704 Å
α = 88.37°, β = 125.08°, γ = 89.57°

Ratio:

a:b:c = 1.399 : 1 : 0.61

Unit Cell V:

2,027.78 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of FlörkeiteHide

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General Appearance of Type Material:

Subparallel, short prismatic, pseudo-monoclinic crystals.

Place of Conservation of Type Material:

Naturhistorisches Museum Wien (NHMW), Austria, with catalogue number 2009-IV-a.

Geological Setting of Type Material:

A pyrometamorphically modified Ca-rich xenolith of the Tertiary basement, which was enclosed with the leucite-tephritic lava.

Associated Minerals at Type Locality:

Synonyms of FlörkeiteHide

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Other Language Names for FlörkeiteHide

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Relationship of Flörkeite 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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Fluorescence of FlörkeiteHide

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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 FlörkeiteHide

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References for FlörkeiteHide

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Reference List:

C. Lengauer, U. Kolitsch, E. Tillmanns (2008): More data on (Na,K,Ca)6[Al8Si8O32]•12H2O, a new triclinic phillipsite-type zeolite from the Bellerberg volcano, Eifel, Germany. Annual Meeting of the DMG, Berlin, Germany, September 14-17, 2008; CD with abstracts, Abs. no. 348.

Lengauer, Christian L., Kolitsch, Uwe, Tillmanns, Ekkehart (2009) Flörkeite, K3Ca2Na[Al8Si8O32]·12H2O, a new phillipsite-type zeolite from the Bellerberg, East Eifel volcanic area, Germany. European Journal of Mineralogy, 21 (4). 901-913 doi:10.1127/0935-1221/2009/0021-1952

Skrzyńska, Katarzyna, Cametti, Georgia, Galuskina, Irina O., Vapnik, Yevgeny, Galuskin, Evgeny (2022) Flörkeite, (K3Ca2Na)[Al8Si8O32]·12H2O: A rare zeolite from pyrometamorphic rocks of the Hatrurim Complex, Israel. Lithosphere, 2022 (1) doi:10.2113/2022/1343791

Localities for FlörkeiteHide

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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.