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Flörkeite

A valid IMA mineral species
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About FlörkeiteHide

09859010014948100062773.jpg
Otto Flörke
Formula:
(K3Ca2Na)[Al8Si8O32] · 12H2O
Colour:
Colorless
Lustre:
Vitreous
Specific Gravity:
2.270 (Calculated)
Crystal System:
Triclinic
Member of:
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

Mindat ID:
38900
Long-form identifier:
mindat:1:1:38900:0
GUID
(UUID V4):
7194a445-8410-4e99-abca-7625b0dd622f

IMA Classification of FlörkeiteHide

Approved
Approval year:
2008

Classification of FlörkeiteHide

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

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

SymbolSourceReference
FlöIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of FlörkeiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Indistinct cleavage on {001}.
Parting:
None
Fracture:
Irregular/Uneven
Density:
2.270 g/cm3 (Calculated)

Optical Data of FlörkeiteHide

Type:
Biaxial (-)
RI values:
nα = 1.506(2) nβ = 1.514(2) nγ = 1.518(2)
2V:
Measured: 71.0° (5), Calculated: 70.2°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak (r < v)
Pleochroism:
Non-pleochroic

Chemistry of FlörkeiteHide

Mindat Formula:
(K3Ca2Na)[Al8Si8O32] · 12H2O

Crystallography of FlörkeiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
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)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.965 Å(45)
4.065 Å(35)
3.235 Å(100)
3.162 Å(80)
3.135 Å(80)
2.736 Å(60)
2.712 Å(40)
2.665 Å(40)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust>4.50
8 : Mafic igneous rocks

Type Occurrence of FlörkeiteHide

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

Other Language Names for FlörkeiteHide

German:Flörkeit

Relationship of Flörkeite to other SpeciesHide

Member of:
Other Members of this group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2OMon. 2 : P21
AmiciteK2Na2Al4Si4O16 · 5H2OMon. 2
Ammonioleucite(NH4)(AlSi2O6)Tet. 4/m : I41/a
AnalcimeNa(AlSi2O6) · H2OTric. 1 : P1
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2OHex.
BikitaiteLiAlSi2O6 · H2OTric. 1 : P1
BoggsiteCa8Na3(Si,Al)96O192 · 70H2OOrth. mmm (2/m 2/m 2/m) : Imma
Brewsterite SubgroupZeolite Group.
Chabazite-Levyne SubgroupM[Al2Si4O12] · 6H2O
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
Clinoptilolite SubgroupM3-6(Si30Al6)O72 · 20H2O
CowlesiteCaAl2Si3O10 · 6H2OOrth. mmm (2/m 2/m 2/m)
Dachiardite SubgroupZeolite Group.
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
EdingtoniteBa[Al2Si3O10] · 4H2OOrth. 2 2 2 : P21 21 21
EpistilbiteCaAl2Si6O16 · 5H2OMon.
Erionite SubgroupM2[Al4Si14O36] · 15H2O
Faujasite SubgroupM3.5[Al7Si17O48] · 32H2O
Ferrierite SubgroupZeolite Group.
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2OMon. 2/m : P21/b
Garronite Subgroup
GaultiteNa4Zn2Si7O18 · 5H2OOrth. mm2 : Fdd2
Gismondine SubgroupZeolite Group.
Gmelinite SubgroupIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2OOrth. mmm (2/m 2/m 2/m) : Pnma
GoosecreekiteCa[Al2Si6O16] · 5H2OMon. 2 : P21
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2OOrth. mmm (2/m 2/m 2/m) : Cmca
Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
HsianghualiteCa3Li2(Be3Si3O12)F2Iso. 4 3 2 : I41 3 2
KirchhoffiteCs(BSi2O6)Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
LaumontiteCaAl2Si4O12 · 4H2OMon. 2/m : B2/m
Loomisite Ba[Be2P2O8] · H2OMon. m
LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
MartinandresiteBa2(Al4Si12O32) · 10H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
Mazzite SubgroupZeolite Group.
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2OOrth. mmm (2/m 2/m 2/m) : Immm
Montesommaite(K,Na)9Al9Si23O64 · 10H2OOrth. mm2 : Fdd2
Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2OOrth.
MutinaiteNa3Ca4Si85Al11O192 · 60H2OOrth. mmm (2/m 2/m 2/m) : Pnma
NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2OHex. 6 m2 : P6m2
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
ParthéiteCa2(Si4Al4) O15 (OH)2 · 4H2OMon. 2/m : B2/b
Paulingite SubgroupPaulingite was originally described in 1960.
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mmm
Phillipsite SubgroupZeolite Group.
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2OIso. m3m (4/m 3 2/m) : Ia3d
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mcm
Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2OOrth.
Thomsonite SubgroupThe large majority of "thomsonite" is thomsonite-Ca.
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[Al3Si3O12]4(OH)8 · nH2OIso. m3m (4/m 3 2/m) : Fm3m
UM1996-38-SiO:AlCaHNaNa-Ca-Al-Si-O-H
UM1999-33-SiO:AlHKNaK7Na5Al12Si20O64 · 24H2O
UM2002-40-SiO:AlCaHKMgNa(Mg,Ca,Na,K)7.5(Al12.8Si51.2)O128 · 65H2OTet. 4 2 2 : P41 2 2
Unnamed (Ca analogue of Merlinoite)(Ca,K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O ?
WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m : B2/m
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2OMon. m : Bb
Wenkite(Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2OHex. 6 m2 : P62m
WillhendersoniteKCa[Al3Si3O12] · 5H2OTric. 1 : P1
YugawaraliteCaAl2Si6O16 · 4H2OMon. m : Pb

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Flörkeite associated with WillhendersoniteKCa[Al3Si3O12] · 5H2O
3 photos of Flörkeite associated with Thomsonite Subgroup
2 photos of Flörkeite associated with Gismondine-CaCaAl2Si2O8 · 4H2O
1 photo of Flörkeite associated with WollastoniteCa3(Si3O9)
1 photo of Flörkeite associated with Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
1 photo of Flörkeite associated with Gismondine-SrSr4(Si8Al8O32) · 9H2O
1 photo of Flörkeite associated with Lévyne
1 photo of Flörkeite associated with ApatiteCa5(PO4)3(Cl/F/OH)
1 photo of Flörkeite associated with Apophyllite GroupAB4[Si8O22]X · 8H2O
1 photo of Flörkeite associated with ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O

Related Minerals - Strunz-mindat GroupingHide

9.GC.Garronite-NaNa6(Al6Si10O32) · 8.5H2OMon. 2
9.GC.Gismondine-SrSr4(Si8Al8O32) · 9H2OOrth. 2 2 2 : C2 2 21
9.GC.05AmiciteK2Na2Al4Si4O16 · 5H2OMon. 2
9.GC.05Garronite-CaNa2Ca5Al12Si20O64 · 27H2OTet. 4 2m : I4m2
9.GC.05Gismondine-CaCaAl2Si2O8 · 4H2OMon. 2/m : P21/b
9.GC.05GobbinsiteNa5(Si11Al5)O32 · 11H2OOrth. mmm (2/m 2/m 2/m) : Pnma
9.GC.05Gismondine-BaBa2Al4Si4O16 · 4-6H2O
9.GC.10HarmotomeBa2(Si12Al4)O32 · 12H2OMon. 2/m : P21/m
9.GC.10Phillipsite-Ca(Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2OMon. 2/m : P21/m
9.GC.10Phillipsite-K(K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2OMon. 2/m : P21/m
9.GC.10Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2OMon. 2/m : P21/m
9.GC.10MartinandresiteBa2(Al4Si12O32) · 10H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
9.GC.15Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2OOrth. mmm (2/m 2/m 2/m) : Immm
9.GC.20Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.GC.20Mazzite-NaNa8[Al4Si14O36]2 · 30H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.GC.25PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.GC.30BoggsiteCa8Na3(Si,Al)96O192 · 70H2OOrth. mmm (2/m 2/m 2/m) : Imma
9.GC.35Paulingite-Ca(Ca,K,Na,Ba, ◻)10 (Si, Al)42O84 · 34H2OIso. m3m (4/m 3 2/m)
9.GC.35Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2OIso. m3m (4/m 3 2/m)
9.GC.35Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2OIso.

Fluorescence of FlörkeiteHide

Other InformationHide

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

References for FlörkeiteHide

Localities for FlörkeiteHide

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

- 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.
Germany
 
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mayen
in the collection of Christof Schäfer
Skrzyńska et al. (2023)
      • Vordereifel
        • Ettringen
. +1 other reference
        • Kottenheim
          • Winfeld
in the collection of Christof Schäfer
    • Vulkaneifel
      • Daun
        • Üdersdorf
Blaß et al. (2015)
      • Gerolstein
        • Gerolstein
          • Roth
Blaß et al. (2015)
        • Hillesheim
Blaß et al. (2013) +1 other reference
        • Hohenfels-Essingen
Blaß et al. (2015)
Israel
 
  • Southern District (HaDarom District)
    • Tamar Regional Council
Skrzyńska et al. (2022)
 
Mineral and/or Locality  
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