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Fluorapophyllite-(K)

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Formula:
KCa4(Si8O20)(F,OH) · 8H2O
Colour:
Colourless, pale green, aquamarine, white, pink, yellow
Lustre:
Vitreous, Pearly
Hardness:
4½ - 5
Specific Gravity:
2.33 - 2.37
Crystal System:
Tetragonal
Name:
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.
Fluorapophyllite-(K) - Hydroxyapophyllite-(K) Series.

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


Classification of Fluorapophyllite-(K)

Approved, 'Grandfathered' (first described prior to 1959)
Approval Year:
1976
9.EA.15

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
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
17.1.5

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

Physical Properties of Fluorapophyllite-(K)

Vitreous, Pearly
Transparency:
Transparent, Translucent
Comment:
Pearly on cleavage {001}
Colour:
Colourless, pale green, aquamarine, white, pink, yellow
Streak:
White
Hardness:
4½ - 5 on Mohs 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)

Type:
Uniaxial (+)
RI values:
nω = 1.530 - 1.536 nε = 1.532 - 1.538
Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
High, may be anomalous

Chemical Properties of Fluorapophyllite-(K)

Formula:
KCa4(Si8O20)(F,OH) · 8H2O
IMA Formula:
KCa4Si8O20F · 8H2O
Common Impurities:
Al,Na

Crystallography of Fluorapophyllite-(K)

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/mnc
Cell Parameters:
a = 8.963(2) Å, c = 15.804(2) Å
Ratio:
a:c = 1 : 1.763
Unit Cell V:
1,269.62 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular to prismatic
Twinning:
Rare on {111}

X-Ray Powder Diffraction

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Synonyms of Fluorapophyllite-(K)

Other Language Names for Fluorapophyllite-(K)

Relationship of Fluorapophyllite-(K) to other Species

Forms a series with:

Common Associates

Associated Minerals Based on Photo Data:
Stilbite-Ca662 photos of Fluorapophyllite-(K) associated with Stilbite-Ca on mindat.org.
Stilbite403 photos of Fluorapophyllite-(K) associated with Stilbite on mindat.org.
Quartz242 photos of Fluorapophyllite-(K) associated with Quartz on mindat.org.
Calcite143 photos of Fluorapophyllite-(K) associated with Calcite on mindat.org.
Heulandite-Ca86 photos of Fluorapophyllite-(K) associated with Heulandite-Ca on mindat.org.
Scolecite74 photos of Fluorapophyllite-(K) associated with Scolecite on mindat.org.
Natrolite74 photos of Fluorapophyllite-(K) associated with Natrolite on mindat.org.
Heulandite73 photos of Fluorapophyllite-(K) associated with Heulandite on mindat.org.
Prehnite50 photos of Fluorapophyllite-(K) associated with Prehnite on mindat.org.
Chalcedony48 photos of Fluorapophyllite-(K) associated with Chalcedony on mindat.org.

Related Minerals - Nickel-Strunz Grouping

9.EA.05CuprorivaiteCaCuSi4O10
9.EA.05GillespiteBaFe2+Si4O10
9.EA.05EffenbergeriteBaCuSi4O10
9.EA.05WesselsiteSrCuSi4O10
9.EA.10EkaniteCa2ThSi8O20
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2O
9.EA.20MagadiiteNa2Si14O29 · 11H2O
9.EA.25DalyiteK2ZrSi6O15
9.EA.25DavaniteK2TiSi6O15
9.EA.30Sazhinite-(Ce)Na2CeSi6O14•6H2O
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2O
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2O
9.EA.40OkeniteCa10Si18O46 · 18H2O
9.EA.45NekoiteCa3Si6O15·7H2O
9.EA.50CavansiteCa(VO)Si4O10 · 4H2O
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2O
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2O
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2O
9.EA.65NabesiteNa2BeSi4O10 · 4H2O
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2O
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2O
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4
9.EA.85PlumbophyllitePb2Si4O10 · H2O

Related Minerals - Hey's Chemical Index of Minerals Grouping

17.1.1HectoriteNa0.3(Mg,Li)3(Si4O10)(F,OH)2
17.1.3AgrelliteNaCa2Si4O10F
17.1.4Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2O
17.1.6Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
17.1.7HsianghualiteCa3Li2(Be3Si3O12)F2
17.1.8LeucophaniteNaCaBeSi2O6F
17.1.9NorbergiteMg3(SiO4)(F,OH)2
17.1.10Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
17.1.11Humite(Mg,Fe2+)7(SiO4)3(F,OH)2
17.1.12ClinohumiteMg9(SiO4)4F2
17.1.13CanasiteK3Na3Ca5Si12O30(OH)4
17.1.14Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O
17.1.15CuspidineCa4(Si2O7)(F,OH)2
17.1.16BultfonteiniteCa2(HSiO4)F · H2O
17.1.17ZeophylliteCa13Si10O28(OH)2F8 · 6H2O
17.1.18Rowlandite-(Y)(Y,Ce)4Fe2+(Si2O7)2F2 (?)
17.1.19YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3
17.1.20Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
17.1.21Mosandrite-(Ce)(Ca3REE)[(H2O)2Ca0.50.5]Ti(Si2O7)2(OH)2(H2O)2
17.1.22Hiortdahlite(Na,Ca)2Ca4Zr(Mn,Ti,Fe)(Si2O7)2(F,O)4
17.1.23BurpaliteNa2CaZr(Si2O7)F2
17.1.24SeidozeriteNa4MnZr2Ti(Si2O7)2O2F2
17.1.25Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O
17.1.26Zircophyllite(K,Na)3(Mn,Fe2+)7(Zr,Ti)2Si8O24(O,OH,F)7
17.1.27JinshajiangiteBaNaFe2+4Ti2(Si2O7)2O2(OH)2F
17.1.28RosenbuschiteNa6Ca6Zr3Ti(Si2O7)4O2F6
17.1.29NarsarsukiteNa4(Ti,Fe)2[Si8O20](O,OH,F)2
17.1.30SonoliteMn2+9(SiO4)4(OH)2

Related Minerals - Dana Grouping (8th Ed.)

72.3.1.3Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2O
72.3.1.4CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2O

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.

References for Fluorapophyllite-(K)

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1971): 56: 1234-1242.
Dunn, P. J., Rouse, R. C. & Norberg, J. A. (1978): Hydroxyapophyllite, a new mineral and a redefinition of the apophyllite group. American Mineralogist 63, 196-202.
Dunn, P. J. & Wilson, W. E. (1978): Nomenclature revision in the apophyllite group: hydroxyapophyllite, apophyllite, fluorapophyllite. Min. Record 9, 95-98.
American Mineralogist (1992): 77: 1119.
HATERT, F., MILLS, S.J., PASERO, M. and WILLIAMS, P.A. (2013) CNMNC guidelines for the use of suffixes and prefixes in mineral nomenclature, and for the preservation of historical names. European Journal of Mineralogy 25, 113-115.

Internet Links for Fluorapophyllite-(K)

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https://www.mindat.org/min-1573.html
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Localities for Fluorapophyllite-(K)

Mineral and/or Locality  
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