Flörkeite
A valid IMA mineral species
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About Flörkeite
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.
A distinctly triclinic zeolite, closely related to phillipsite (monoclinic). The triclinic distortion is caused by Al-Si ordering in the crystal structure.
Unique Identifiers
Mindat ID:
38900
Long-form identifier:
mindat:1:1:38900:0
GUID
(UUID V4):
(UUID V4):
7194a445-8410-4e99-abca-7625b0dd622f
IMA Classification of Flörkeite
Approved
Approval year:
2008
Classification of Flörkeite
9.GC.10
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
C : Chains of doubly-connected 4-membered rings
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
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Flö | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Flörkeite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Indistinct cleavage on {001}.
Indistinct cleavage on {001}.
Parting:
None
Fracture:
Irregular/Uneven
Density:
2.270 g/cm3 (Calculated)
Optical Data of Flörkeite
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.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak (r < v)
Pleochroism:
Non-pleochroic
Chemistry of Flörkeite
Mindat Formula:
(K3Ca2Na)[Al8Si8O32] · 12H2O
Crystallography of Flörkeite
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°
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 3a: Earth’s earliest Hadean crust | >4.50 |
8 : Mafic igneous rocks |
Type Occurrence of Flörkeite
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 Flörkeite
Other Language Names for Flörkeite
German:Flörkeit
Relationship of Flörkeite to other Species
Member of:
Other Members of this group:
Alflarsenite | NaCa2Be3Si4O13(OH) · 2H2O | Mon. 2 : P21 |
Amicite | K2Na2Al4Si4O16 · 5H2O | Mon. 2 |
Ammonioleucite | (NH4)(AlSi2O6) | Tet. 4/m : I41/a |
Analcime | Na(AlSi2O6) · H2O | Tric. 1 : P1 |
Bellbergite | (K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O | Hex. |
Bikitaite | LiAlSi2O6 · H2O | Tric. 1 : P1 |
Boggsite | Ca8Na3(Si,Al)96O192 · 70H2O | Orth. mmm (2/m 2/m 2/m) : Imma |
Brewsterite Subgroup | Zeolite Group. | |
Chabazite-Levyne Subgroup | M[Al2Si4O12] · 6H2O | |
Chiavennite | CaMnBe2Si5O13(OH)2 · 2H2O | Mon. 2/m : P21/b |
Clinoptilolite Subgroup | M3-6(Si30Al6)O72 · 20H2O | |
Cowlesite | CaAl2Si3O10 · 6H2O | Orth. mmm (2/m 2/m 2/m) |
Dachiardite Subgroup | Zeolite Group. | |
Direnzoite | NaK6MgCa2(Al13Si47O120) · 36H2O | Orth. mmm (2/m 2/m 2/m) : Pmmn |
Edingtonite | Ba[Al2Si3O10] · 4H2O | Orth. 2 2 2 : P21 21 21 |
Epistilbite | CaAl2Si6O16 · 5H2O | Mon. |
Erionite Subgroup | M2[Al4Si14O36] · 15H2O | |
Faujasite Subgroup | M3.5[Al7Si17O48] · 32H2O | |
Ferrierite Subgroup | Zeolite Group. | |
Ferrochiavennite | Ca1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O | Mon. 2/m : P21/b |
Garronite Subgroup | ||
Gaultite | Na4Zn2Si7O18 · 5H2O | Orth. mm2 : Fdd2 |
Gismondine Subgroup | Zeolite Group. | |
Gmelinite Subgroup | In 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K. | |
Gobbinsite | Na5(Si11Al5)O32 · 11H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
Goosecreekite | Ca[Al2Si6O16] · 5H2O | Mon. 2 : P21 |
Gottardiite | Na3Mg3Ca5Al19Si117O272 · 93H2O | Orth. mmm (2/m 2/m 2/m) : Cmca |
Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O | |
Hsianghualite | Ca3Li2(Be3Si3O12)F2 | Iso. 4 3 2 : I41 3 2 |
Kirchhoffite | Cs(BSi2O6) | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Laumontite | CaAl2Si4O12 · 4H2O | Mon. 2/m : B2/m |
Loomisite | Ba[Be2P2O8] · H2O | Mon. m |
Lovdarite | K2Na6Be4Si14O36 · 9H2O | Orth. mm2 |
Maricopaite | Pb7Ca2(Si,Al)48O100 · 32H2O | Orth. |
Martinandresite | Ba2(Al4Si12O32) · 10H2O | Orth. mmm (2/m 2/m 2/m) : Pmmn |
Mazzite Subgroup | Zeolite Group. | |
Merlinoite | (K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O | Orth. mmm (2/m 2/m 2/m) : Immm |
Montesommaite | (K,Na)9Al9Si23O64 · 10H2O | Orth. mm2 : Fdd2 |
Mordenite | (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O | Orth. |
Mutinaite | Na3Ca4Si85Al11O192 · 60H2O | Orth. mmm (2/m 2/m 2/m) : Pnma |
Nabesite | Na2BeSi4O10 · 4H2O | Orth. 2 2 2 : P21 21 21 |
Natrolite Subgroup | A subgroup of the Zeolite Group. | |
Offretite | KCaMg(Si13Al5)O36 · 15H2O | Hex. 6 m2 : P6m2 |
Pahasapaite | Li8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O | Iso. 2 3 : I2 3 |
Parthéite | Ca2(Si4Al4) O15 (OH)2 · 4H2O | Mon. 2/m : B2/b |
Paulingite Subgroup | Paulingite was originally described in 1960. | |
Perlialite | K9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O | Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm |
Phillipsite Subgroup | Zeolite Group. | |
Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O | Iso. m3m (4/m 3 2/m) : Ia3d |
Roggianite | Ca2Be(OH)2Al2Si4O13 · 2.5H2O | Tet. 4/mmm (4/m 2/m 2/m) : I4/mcm |
Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O | |
Terranovaite | (Na,Ca)8(Si68Al12)O160 · 29H2O | Orth. |
Thomsonite Subgroup | The large majority of "thomsonite" is thomsonite-Ca. | |
Tschernichite | (Ca,Na2)[Al2Si4O12] · 4-8H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm |
Tschörtnerite | Ca4(Ca,Sr,K,Ba)3Cu3[Al3Si3O12]4(OH)8 · nH2O | Iso. m3m (4/m 3 2/m) : Fm3m |
UM1996-38-SiO:AlCaHNa | Na-Ca-Al-Si-O-H | |
UM1999-33-SiO:AlHKNa | K7Na5Al12Si20O64 · 24H2O | |
UM2002-40-SiO:AlCaHKMgNa | (Mg,Ca,Na,K)7.5(Al12.8Si51.2)O128 · 65H2O | Tet. 4 2 2 : P41 2 2 |
Unnamed (Ca analogue of Merlinoite) | (Ca,K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O ? | |
Wairakite | Ca(Al2Si4O12) · 2H2O | Mon. 2/m : B2/m |
Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O | Mon. m : Bb |
Wenkite | (Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2O | Hex. 6 m2 : P62m |
Willhendersonite | KCa[Al3Si3O12] · 5H2O | Tric. 1 : P1 |
Yugawaralite | CaAl2Si6O16 · 4H2O | Mon. m : Pb |
Common Associates
Associated Minerals Based on Photo Data:
7 photos of Flörkeite associated with Willhendersonite | KCa[Al3Si3O12] · 5H2O |
3 photos of Flörkeite associated with Thomsonite Subgroup | |
2 photos of Flörkeite associated with Gismondine-Ca | CaAl2Si2O8 · 4H2O |
1 photo of Flörkeite associated with Wollastonite | Ca3(Si3O9) |
1 photo of Flörkeite associated with Thomsonite-Ca | NaCa2[Al5Si5O20] · 6H2O |
1 photo of Flörkeite associated with Gismondine-Sr | Sr4(Si8Al8O32) · 9H2O |
1 photo of Flörkeite associated with Lévyne | |
1 photo of Flörkeite associated with Apatite | Ca5(PO4)3(Cl/F/OH) |
1 photo of Flörkeite associated with Apophyllite Group | AB4[Si8O22]X · 8H2O |
1 photo of Flörkeite associated with Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O |
Related Minerals - Strunz-mindat Grouping
9.GC. | Garronite-Na | Na6(Al6Si10O32) · 8.5H2O |
9.GC. | Gismondine-Sr | Sr4(Si8Al8O32) · 9H2O |
9.GC.05 | Amicite | K2Na2Al4Si4O16 · 5H2O |
9.GC.05 | Garronite-Ca | Na2Ca5Al12Si20O64 · 27H2O |
9.GC.05 | Gismondine-Ca | CaAl2Si2O8 · 4H2O |
9.GC.05 | Gobbinsite | Na5(Si11Al5)O32 · 11H2O |
9.GC.05 | Gismondine-Ba | Ba2Al4Si4O16 · 4-6H2O |
9.GC.10 | Harmotome | Ba2(Si12Al4)O32 · 12H2O |
9.GC.10 | Phillipsite-Ca | (Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O |
9.GC.10 | Phillipsite-K | (K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O |
9.GC.10 | Phillipsite-Na | (Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O |
9.GC.10 | Martinandresite | Ba2(Al4Si12O32) · 10H2O |
9.GC.15 | Merlinoite | (K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O |
9.GC.20 | Mazzite-Mg | (Mg,K,Ca)5(Si26Al10)O72 · 28H2O |
9.GC.20 | Mazzite-Na | Na8[Al4Si14O36]2 · 30H2O |
9.GC.25 | Perlialite | K9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O |
9.GC.30 | Boggsite | Ca8Na3(Si,Al)96O192 · 70H2O |
9.GC.35 | Paulingite-Ca | (Ca,K,Na,Ba, ◻)10 (Si, Al)42O84 · 34H2O |
9.GC.35 | Paulingite-K | (K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O |
9.GC.35 | Paulingite-Na | (Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O |
Fluorescence of Flörkeite
none
Other Information
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 Flörkeite
mindat.org URL:
https://www.mindat.org/min-38900.html
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References for Flörkeite
Reference List:
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
Localities for Flörkeite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Germany | |
| in the collection of Christof Schäfer |
Skrzyńska et al. (2023) | |
| . +1 other reference |
| in the collection of Christof Schäfer |
| Blaß et al. (2015) |
| Blaß et al. (2015) |
| Blaß et al. (2013) +1 other reference |
| Blaß et al. (2015) |
Israel | |
| Skrzyńska et al. (2022) |
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Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany