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Fluorapophyllite-(K)

A valid IMA mineral species - grandfathered
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Apophyllite was named in 1806 by Rene Just Haüy from the Greek for "away from" (ἀπό, apo) and "leaf" (φύλλον, phyllos), in allusion to the way it exfoliates upon heating. Chemical variants were recognized by Pete J. Dunn, Roland C. Rouse, and Julie A. Norberg in 1978.
Dimorph of:
UM1991-22-SiO:CaFHK
Fluorapophyllite-(K) - Hydroxyapophyllite-(K) Series.

The name was revised from apophyllite-(KF) to fluorapophyllite-(K) (Hatert et al. 2013).


Unique Identifiers
IMA Formula:
KCa4Si8O20F · 8H2O
Approval year:
1976

Classification of Fluorapophyllite-(K)

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Dana 8th ed.:
72.3.1.1

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
3 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Hey's CIM Ref.:
17.1.5

17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)

Mineral Symbols
Transparency:
Transparent, Translucent
Comment:
Pearly on cleavage {001}
Colour:
Colourless, pale green, aquamarine, white, pink, yellow
Streak:
White
Hardness:
4½ - 5 onMohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}
Imperfect on {110}
Fracture:
Irregular/Uneven
Density:
2.33 - 2.37 g/cm3 (Measured)    2.37 g/cm3 (Calculated)

Optical Data of Fluorapophyllite-(K)
Surface Relief:
Moderate
Dispersion:
High, may be anomalous

Chemistry of Fluorapophyllite-(K)
Common Impurities:
Al,Na

Chemical Analysisnear Ahmednagar, Maharashtra, India 733
Data courtesy of RRUFF project at University of Arizona, used with permission.

Geological Environment

Other Language Names for Fluorapophyllite-(K)

Varieties of Fluorapophyllite-(K)

Relationship of Fluorapophyllite-(K) to other Species
Other Members of Apophyllite Group:
Fluorapophyllite-(Cs)CsCa4(Si8O20)F · 8H2OTet.
Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
Fluorapophyllite-(NH4)NH4Ca4(Si8O20)F · 8H2OTet. 4/mmm(4/m2/m2/m) :P4/mnc
Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet. 4/mmm(4/m2/m2/m)
Hydroxymcglassonite-(K)KSr4Si8O20(OH) · 8H2OTet.
Forms a series with:
Hydroxyapophyllite-(K)Fluorapophyllite-(K) - Hydroxyapophyllite-(K) Series

Common AssociatesTet.9.EA.Miyawakiite-(Y)◻Y4Fe2(Si8O20)(CO3)4(H2O)3Tet. 4/mmm(4/m2/m2/m) :I4/mcm9.EA.Bussyite-(Y)(Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34Mon. 2 :B29.EA.Fluorapophyllite-(NH4)NH4Ca4(Si8O20)F · 8H2OTet. 4/mmm(4/m2/m2/m) :P4/mnc9.EA.05GillespiteBaFe2+Si4O10Tet. 4/mmm(4/m2/m2/m) :P4/ncc9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm(4/m2/m2/m) :P4/ncc9.EA.05WesselsiteSrCuSi4O10Tet. 4/mmm(4/m2/m2/m) :P4/ncc9.EA.05EffenbergeriteBaCuSi4O10Tet. 4/mmm(4/m2/m2/m) :P4/ncc9.EA.07Fluorapophyllite-(Cs)CsCa4(Si8O20)F · 8H2OTet.9.EA.10EkaniteCa2ThSi8O20Tet. 422 :I4229.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet. 4/mmm(4/m2/m2/m)9.EA.20MagadiiteNa2Si14O29 · 11H2OOrth.mm2 :Fdd29.EA.25DalyiteK2ZrSi6O15Tric.1 :P19.EA.25DavaniteK2TiSi6O15Tric.9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth.mm2 :Pmm29.EA.30Sazhinite-(Ce)Na3CeSi6O15 · 2H2OOrth.mm2 :Pmm29.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon. 2/m :B2/m9.EA.40OkeniteCa10Si18O46 · 18H2OTric.1 :P19.EA.45Perettiite-(Y)Y2Mn4FeSi2B8O24Orth.mmm(2/m2/m2/m) :Pmna9.EA.45NekoiteCa3Si6O15 · 7H2OTric. 1 :P19.EA.45Badakhshanite-(Y)Y2Mn4Al(Si2B7BeO24)Orth.mmm(2/m2/m2/m) :Pnma9.EA.47ShlykoviteKCa[Si4O9(OH)] · 3H2OMon. 2/m :P21/b9.EA.50DiegogattaiteNa2CaCu2Si8O20 · H2OMon. 2/m :B2/m9.EA.50CavansiteCa(VO)Si4O10 · 4H2OOrth.mmm(2/m2/m2/m)9.EA.52YangitePbMnSi3O8 · H2OTric.1 :P19.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth.mm29.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth.mmm(2/m2/m2/m) :Pbcn9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2OMon. 2/m :P21/b9.EA.65NabesiteNa2BeSi4O10 · 4H2OOrth. 222 :P2121219.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2OTric.9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2OMon. 2/m :B2/b9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4Mon. 2/m :B2/b9.EA.85PlumbophyllitePb2Si4O10 · H2OOrth.mmm(2/m2/m2/m) :Pbcn

Radioactivityshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).

D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield

Fluorescence of Fluorapophyllite-(K)

Other Information
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  • Raman and XRD data at RRUFF project
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    • References for Fluorapophyllite-(K)ⓘBroken HillCan Mineral February 1Ryall et al. (1968)+1 other referenceLehrmann (2012)www.crocoite.com (2003)www.crocoite.com (2003)Bottrill et al. (2008)www.crocoite.com (2001)Bottrill et al. (2008)Bottrill et al. (2008)Ralph Bottrill collectionBirch et al. (1984)Museum Victoria Mineralogy Collection- (n.d.)Birch (1983)
    Austria
     
    Niedermayr et al. (1995)J.Metzger (1997)Annalen 1999Niedermayr et al. (1995)Exel (1993)Strasser (1989)Strasser (1989)Strasser (1989)Strasser (1989)Strasser (1989)Strasser (1989)Strasser (1989)Strasser (1989)Aufschluss 1972 (SB)Exel (1993)Exel (1993)Exel (1993)
    Brazil
     
    Atencio et al. (2005)Carles Curto Milàdan weinrich
    Canada
     
    Ronnie Van Dommelen collection.Pe-Piper et al. (2002)Aumento et al. (1966)Ronnie Van Dommelen collection.Pe-Piper (2000)SAGE (1981)Heinrich et al. (2004)László Horváth (p.c., 2003)+1 other referenceMuseum Thetford Mines MMMRA1998.164Horváth et al. (2013)dan weinrichHorváth collectionHorváth collectionGrice (1989)+1 other referenceHorváth collection - XRD & EDSCan. Museum of Nature & Horváth ...
    Chile
     
    Maurizio Dini & Robert Jenkins ...+1 other reference
    China
     
    Hawthorne et al. (2002)Ottens et al. (2012)Möhn et al. (05/2021)Xuyin Yuan et al. (1993)
    Costa Rica
     
    Micro Probe Volume VII Number 7 Spring ...Micro Probe Volume VII Number 7 Spring ...
    Czech Republic
     
    Žáček et al. (2001)Tschernich (1992)Pauliš et al. (2023)Bohuslav Burev collectionTvrdý et al. (2023)Pauliš et al. (2024)Ulrych (2000)
    Finland
     
    Sahama (1965)+2 other referencesJoel Dyer collection
    France
     
    Leconte J. (2015)Queneau (n.d.)+1 other referenceDufrénoy M. (1836)Queneau (n.d.)+1 other referenceAndré MELLE collection - Nicolas ...
    Germany
     
    70.+1 other referenceWalenta (1996)Falkenstein (2010)Weiß (1990)Wolfgang Hampel (2011)Weiß (1990)Weiß (1990)Weiß (1990)Belendorff (2021)Weiß (1990)Weiß (1990)Weiß (1990)Weiß (1990)Weiß (1990)Weiß (1990)+1 other referenceHentschel (1983)Hartmut Hensel collectionWeiß (1990)Weiß (1990)in the collection of Christof Schäferin the collection of Christof Schäfer+1 other referenceBlaß et al. (2012)Lapis 30 (7/8)Wittern (2001)Lapis 11 (7/8)Wittern (2001)
    India
     
    various added photos+1 other referenceSpecimens received from Salim Tyebjeedan weinrichvarious added photosFabreminerals specimen photoMoore (2002)Lavinsky (n.d.)Jacques Malassé and Geri Meier ...Karel Bal Collectionwww.irocks.com (2002)Michael Shaw CollectionLavinsky (n.d.)King (n.d.)King (n.d.)+1 other referenceLavinsky (n.d.)Fabre (n.d.)Jacques Malasse specimen+1 other referencePraszkier et al. (2007)+1 other referencewww.spiriferminerals.com (2010)Lavinsky (n.d.)Richard Dale Collection+1 other reference
    Italy
     
    XRD analysis at Bari University415.+1 other referenceEDX analysisMarchesini et al. (2025)Stoppa et al. (2010)+2 other referencesCarlo Cassinelli infrared spectrum (unpublished data)+1 other referencePXRD at Padova University+1 other reference
    Japan
     
    - (n.d.)Masutomi Museum specimensNichika specimensMatsueda (1980)Momma et al. (2015)Petrov (n.d.)+1 other referenceNagashima et al. (2021)
    Madagascar
     
    Praszkier (2010)
    Mexico
     
    Fluorite: The Collector's Choice. Extra ...photos of new finds
    Morocco
     
    Ph. M. Sonnet : "Burtite
    Namibia
     
    Uwe Kolitsch (structure refinement from single-crystal X-ray diffraction data)+10 other references
    Norway
     
    Larsen (1980)Larsen (1980)+1 other referenceLarsen (1980)Berg (n.d.)+1 other referenceBancroft et al. (2001)Larsen (1980)Larsen (1980)Eldjarn (1973)+1 other referenceSelbekk (1991)Selbekk (1991)Nordrum (2004)Nordrum (2004)Nordrum (2004)Nordrum (2004)Larsen (1980)Larsen (1980)Larsen (1980)Larsen et al. (2010)Larsen et al. (2010)Knut Edvard Larsen collection (MM-2460)Larsen et al. (2010)Nordrum (2000)Larsen et al. (1976)Berge (n.d.)Burvald (1993)Burvald (1993)Witsø (1998)Larsen (1980)Larsen et al. (2010)Larsen et al. (2010)- (n.d.)Berge (n.d.)Ingulv Burvald collection 1988Andersen (1993)Larsen et al. (2010)Andresen (2011)Larsen et al. (2010)Hansen (1981)Engvoldsen et al. (1991)Larsen et al. (2010)Peter Andresen colletion.Personally collected by Peter Andresen ...Larsen et al. (2010)Nordrum (2004)Nordrum (2000)Collected by Peter Andresen 2009+1 other referenceBerge (n.d.)Larsen et al. (2010)Larsen (1988)+1 other referenceLarsen (1980)+2 other referencesBrøgger (1890, January)+1 other referenceLarsen et al. (2010)Andersen et al. (1994)Larsen (1980)Selbekk (1990)
    Poland
     
    Kruszewski et al. (Lower Silesian Coal Basin)WŁODYKA R. et al. (2004)
    Romania
     
    www.minerals-of-the carpathians.eu (2009)Marincea et al. (2023)+2 other referencesHîrtopanu P. et al. (2022)Szakáll (2002)
    Russia
     
    Pavel.M. Kartashov (n.d.)Talovina et al. (2003)Kaneva et al. (2020)Burlakov (1999)Belousov et al. (1963)+2 other referencesKudryashova (1973)Spiridonov et al. (2016)P.M.Kartashov data+1 other referencePekov et al. (2004)+1 other referenceCámara et al. (2013)+1 other referenceAmerican MineralogistArzamastsev et al. (2008)Konopleva et al. (2008)Pavel.M. Kartashov (n.d.)Pekov et al. (2003) ...Pekov (2000) ...+1 other referenceGrant et al. (2001)Grant et al. (2001)Grant et al. (2001)Pavel.M. Kartashov (n.d.)+1 other reference
    Slovakia
     
    Ďuďa R. et al. (1993)ĎuďaDuda et. all.BačoĎuďa
    South Africa
     
    Cairncross et al. (1995)Cairncross et al. (1995)Heron (1985)+2 other referencesCairncross et al. (1995)Gliddon (1996)+1 other referenceCairncross et al. (1995)King et al. (1989)Cairncross et al. (1995)Cairncross et al. (1995)Cairncross et al. (1995)Cairncross et al. (1995)
    Spain
     
    Calvo Rebollar (2018)González del Tánago et al. (2008)Tánago et al. (2012)Jiménez R. et al. (2004)González del Tánago et al. (2008)González del Tánago et al. (2008)González del Tánago et al. (2008)
    Sweden
     
    Grensman et al. (2001)Joan Rosell (2025)Otter (2004)Natural History MuseumSandström et al. (2009)Östra Värmlands Mineral SocietyNysten (1984)+1 other reference
    Switzerland
     
    Stalder et al. (1998)Stalder et al. (1998)Stalder et al. (1998)Stalder et al. (1998)Bracke (n.d.)Stalder et al. (1998)Stalder (1980)+1 other referenceStalder et al. (1998)Stalder et al. (1998)Stalder et al. (1998)Bracke (n.d.)Ansermet (2004)+1 other reference
    Tajikistan
     
    Agakhanov et al. (2011)
    Uganda
     
    Collection: Paul Mestrom+1 other reference
    UK
     
    BMS CollectionHaas (n.d.)Moreton et al. (2012)
    Ukraine
     
    Tischenko A. data
    USA
     
    RUFFWilliams (1976)+1 other referenceChris Stefano specimenPemberton (1983)+1 other reference ...Rocks & Minerals 79:4Eckel et al. (1997)Wilson (1988)Moritz (n.d.)Cristofono (n.d.)Cristofono (n.d.)Moritz (n.d.)Garabedian (1998)Moritz (n.d.)Moritz (n.d.)Moritz (n.d.)Januzzi et al. (1976)Harold Moritz CollectionTed Johnson collectionFormer Dr. Warren Johannson collectionHeinrich et al. (2004)Heinrich et al. (2004)Heinrich et al. (2004)+1 other referenceHeinrich et al. (2004)Heinrich et al. (2004)Heinrich et al. (2004)Heinrich et al. (2004)Heinrich et al. (2004)Morris (1983)+2 other referencesHeinrich et al. (2004)+1 other referenceCastor et al. (2004)Focus on Fort Lee - A Key and Guide to ...+1 other referenceRocks & Min.: 18:332-333.Minerals of Laurel Hill et al. (published privately)Imbriacco (2009)Dana 6:1066.Rocks & Minerals 80:4 pp234-241+1 other referenceKent et al. (2000)Cummings (1987)Palache (1935)+2 other referencesFOMS Millsite Committee (1986)Stephen KuitemsJ. KolicCummings (1987)Rocks & Min.:13:75-79.Northrop et al. (1996)Northrop et al. (1996)DeMark (1989)Chamberlain et al. (1999)John H. Betts (2009)Former Steve Adams collectionMicro Probe Vol. 7 No. 2 Fall 1995+1 other referenceMicro Probe Vol. 7 No. 2 Fall 1990+1 other referenceMicro Probe Vol. 6 No. 5 Fall 1987+1 other referenceTschernich (1992)- (n.d.)Micro Probe Volume VI Number 8Micro Probe Volume VII Number 8 Fall ...Micro Probe Volume VII Number 8 Fall ...Micro Probe Volume VII Number 10 Fall ...Micro Probe Vol. 6 No. 4+1 other referenceMicro Probe Volume VII Number 3 Spring ...Micro Probe Volume IX Number 2 Fall 2000Rocks & Min.: 21:278+2 other referencesDana 6:471Dana 6: 446Michael W. Kieron collectionMeier et al. (K, Na)Meier and Kearns (2011)Micro Probe VolumeVIII Number 8 Fall ...Micro Probe Volume VII Number 7 Spring ...Bill & Diana Dameron Collection
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