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Fluorapophyllite-(K)

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Formula:
KCa4(Si8O20)(F,OH) · 8H2O
System:
Tetragonal
Colour:
Colourless, pale green, ...
Hardness:
4½ - 5
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.
Apophyllite-(KF)-Apophyllite-(KOH) Series.

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

Classification of Fluorapophyllite-(K)

Approved 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)
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Occurrences of Fluorapophyllite-(K)

Geological Setting:
Secondary mineral in cavities in basalts, cavities in granite, in tactites, some hydrothermal veins.

Physical Properties of Fluorapophyllite-(K)

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

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 Volume:
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.

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
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Na

Relationship of Fluorapophyllite-(K) to other Species

Series:
Forms a series with Hydroxyapophyllite-(K) (see here)
9.EA.05CuprorivaiteCaCu[Si4O10]
9.EA.05GillespiteBaFe2+[Si4O10]
9.EA.05EffenbergeriteBaCu[Si4O10]
9.EA.05WesselsiteSrCu[Si4O10]
9.EA.10Ekanite(Ca,Fe2+,Pb)2(Th,U)[Si8O20]
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)Na3Ce[Si6O15] · 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
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
17.1.13CanasiteK2Na4Ca5(Si12O30(OH,F)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
17.1.17ZeophylliteCa13(Si10O28)F10 · 6H2O
17.1.18Rowlandite-(Y)(Y,Ce)4Fe2+(Si2O7)2F2 (?)
17.1.19Yuksporite(K,Ba)NaCa2(Si,Ti)4O11(F,OH) · H2O
17.1.20Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
17.1.21Mosandrite(◻,Ca,Na)3(Ca,REE)4Ti(Si2O7)2[H2O,OH,F]4 · H2O
17.1.22Hiortdahlite(Ca,Na)3(Zr,Ti)(Si2O7)(O,OH,F)2
17.1.23BurpaliteNa2CaZr(Si2O7)F2
17.1.24SeidozeriteNa8Mn22+Zr3Ti3(Si2O7)4O4F4
17.1.25ThorosteenstrupineCaMnThSi4O11(OH)F · 6H2O
17.1.26Zircophyllite(K,Na)3(Mn,Fe2+)7(Zr,Ti)2Si8O24(O,OH,F)7
17.1.27JinshajiangiteBaNaFe42+Ti2(Si2O7)2O2(OH)2F
17.1.28Rosenbuschite(Ca,Na)3(Zr,Ti)(Si2O7)OF
17.1.29NarsarsukiteNa4(Ti,Fe)2[Si8O20](O,OH,F)2
17.1.30SonoliteMn92+(SiO4)4(OH,F)2

Other Names for Fluorapophyllite-(K)

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:
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)

Specimens:
The following Fluorapophyllite-(K) specimens are currently listed for sale on minfind.com.

Localities for Fluorapophyllite-(K)

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.
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