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Flörkeite

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About FlörkeiteHide

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 (born 1926), 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.


Classification of FlörkeiteHide

Approved
Approval Year:
2008
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

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

Chemical Properties of FlörkeiteHide

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 (45)
4.065 (35)
3.235 (100)
3.162 (80)
3.135 (80)
2.736 (60)
2.712 (40)
2.665 (40)

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,K)(AlSi2O6)Tet.
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-Ba(Ba,Sr)[Al2Si6O16] · 5H2OMon. 2/m : P21/m
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Levyne SubgroupA subgroup of the Zeolite Group.
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
ClinoptiloliteNote on the distinguishing differences between clinoptilolite and heulandite (hhttp://rruff.
CowlesiteCaAl2Si3O10 · 6H2OOrth.
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2OMon.
Dachiardite-KK4(Si20Al4O48)·13H2OMon.
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2OMon.
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2OMon.
ErioniteThis name now refers to a group of related minerals.
Faujasite
Faujasite-Ca(Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2OIso.
FerrieriteZeolite Group.
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2OMon. 2/m : P21/b
Garronite-CaNa2Ca5Al12Si20O64 · 27H2OTet. 4 2m : I4m2
GaultiteNa4Zn2Si7O18 · 5H2OOrth. mm2 : Fdd2
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
GmeliniteIn 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K.
GobbinsiteNa5(Si11Al5)O32 · 11H2OOrth.
GoosecreekiteCa[Al2Si6O16] · 5H2OMon.
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2OOrth.
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2OMon. 2/m : P21/m
Heulandite subgroupNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
HsianghualiteCa3Li2(Be3Si3O12)F2
KirchhoffiteCs(BSi2O6)Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
LaumontiteCaAl2Si4O12 · 4H2OMon. 2/m : B2/m
LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2OHex.
Mazzite-NaNa8[Al4Si14O36]2 · 30H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2OOrth.
Montesommaite(K,Na)9Al9Si23O64 · 10H2OOrth.
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2OOrth.
MutinaiteNa3Ca4Si85Al11O192 · 60H2OOrth.
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-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2OIso.
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2OIso.
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2OIso.
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2OHex.
PhillipsiteZeolite Group.
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2OIso. m3m (4/m 3 2/m) : Ia3d
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2OTet.
Stilbite subgroupThis name now refers to the zeolite subgroup including the Barrerite - Stilbite-Ca - ...
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2OOrth.
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2OOrth. mmm (2/m 2/m 2/m)
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2OOrth. mmm (2/m 2/m 2/m)
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mmm
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2OIso. m3m (4/m 3 2/m) : Fm3m
WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2OMon.
Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2OHex.
WillhendersoniteKCa[Al3Si3O12] · 5H2OTric.
YugawaraliteCaAl2Si6O16 · 4H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Willhendersonite3 photos of Flörkeite associated with Willhendersonite on mindat.org.
Gismondine-Ca2 photos of Flörkeite associated with Gismondine-Ca on mindat.org.
Wollastonite1 photo of Flörkeite associated with Wollastonite on mindat.org.
Thomsonite-Ca1 photo of Flörkeite associated with Thomsonite-Ca on mindat.org.
Thomsonite1 photo of Flörkeite associated with Thomsonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.GC.05AmiciteK2Na2Al4Si4O16 · 5H2OMon. 2
9.GC.05Garronite-CaNa2Ca5Al12Si20O64 · 27H2OTet. 4 2m : I4m2
9.GC.05Gismondine-CaCaAl2Si2O8 · 4H2O
9.GC.05GobbinsiteNa5(Si11Al5)O32 · 11H2OOrth.
9.GC.10Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 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.
9.GC.15Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2OOrth.
9.GC.20Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2OHex.
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.
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.
9.GC.35Paulingite-K(K2,Ca,Na2,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.

References for FlörkeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kolitsch, U. & Blass, G. (2005): Triclinic "phillipsite" in a Ca-rich xenolith from the Bellerberg, Eifel, Germany: reduction of symmetry due to nearly complete Al-Si ordering - evidence for an unusual cooling history? Mitt. Österr. Mineral. Ges. 151, 66.
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.
G. Blass, H.-W. Graf, U. Kolitsch and D. Sebold (2009): The new finds from the volcanic Eifel (II). Mineralien-Welt 20 (2), 38-49. (in German)
C. L. Lengauer, U. Kolitsch, E. Tillmanns (2009): Flörkeite, K3Ca2Na[Al8Si8O32]•12H2O, a new phillipsite-type zeolite from the Bellerberg, East Eifel volcanic area, Germany. Eur. J. Mineral. 21, 901-913.
Ternes, B. (2010): Flörkeit - ein neuer Zeolith und seine Begleiter am Bellerberg-Vulkan. Lapis, 35 (10), 28-29 (in German).

Internet Links 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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Rhineland-Palatinate
    • Daun
      • Hinterweiler
Blaß, G., Kruijen F. (2015), Mineralienwelt 1/2015, Bode-Verlag
      • Üdersdorf
Blaß, G., Kruijen F. (2015), Mineralienwelt 1/2015, Bode-Verlag
    • Gerolstein
      • Roth
Blaß, G., Kruijen F. (2015), Mineralienwelt 1/2015, Bode-Verlag
    • Hillesheim
G. Blaß, F.J. Emmerich, H.W. Graf, Minerale der Vulkaneifel, DVD Version 2013/1.1
    • Mayen
      • Ettringen
        • Bellerberg volcano
C. L. Lengauer, U. Kolitsch, E. Tillmanns (2009): Flörkeite, K3Ca2Na[Al8Si8O32].12H2O, a new phillipsite-type zeolite from the Bellerberg, East Eifel volcanic area, Germany. Eur. J. Mineral. 21, 901-913;.
          • Southern lava flow
            • Mayener Feld
in the collection of Christof Schäfer
Mineral and/or Locality  
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