Apophyllite-(KF) Mineral Data
General Apophyllite-(KF) Information
Chemical Formula:
(K,Na)Ca4Si8O20(F,OH)•8(H2O)
Composition:
Molecular Weight = 760.47 gm
Potassium 4.37 % K 5.26 % K2 O
Sodium 0.45 % Na 0.61 % Na2 O
Calcium 21.08 % Ca 29.50 % CaO
Silicon 29.55 % Si 63.21 % SiO2
Hydrogen 0.01 % H 0.12 % H2 O
Oxygen 42.29 % O
Fluorine 2.25 % F 2.25 % F
- %
F -0.95 % -O=F2
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
K0.85 Na0.15 Ca4 Si8 O20 F0.9 (OH)0.1
Environment:
A secondary mineral in amygdules or druses in basalts. A late-stage mineral in some mineral deposits.
IMA Status:
Approved IMA 1978
Locality:
Poona, Nasik, and Bombay districts, Maharashtra, India. Link to MinDat.org Location Data.
Name Origin:
From the Greek apophylliso - "it flakes off." and the composition containing fluorine;
Name Pronunciation:
Apophyllite-(KF) + Pronunciation
Synonym:
Fluorapophyllite - Renamed to Apophyllite-(F) by Mineralogical Record, v39, (2008), p 131
Apophyllite-(KF) Image
Images:
Apophyllite-(KF) Crystallography
Axial Ratios:
a:c = 1:1.76324
Cell Dimensions:
a = 8.963, c = 15.804, Z = 2; V = 1,269.62 Den(Calc)= 1.99
Crystal System:
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnc
X Ray Diffraction:
By Intensity(I/Io ): 7.81(1), 2.49(0.9), 3.57(0.6), 2.95(0.5), 3.9(0.5), 4.51(0.45), 3.17(0.4),
Physical Properties of Apophyllite-(KF)
Cleavage:
{001} Perfect
Color:
White, Pink, Green, Yellow, Violet.
Density:
2.3 - 2.4, Average = 2.34
Diaphaneity:
Transparent to Translucent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Habit:
Pseudo Cubic - Crystals show a cubic outline.
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Apophyllite-(KF)
Gladstone-Dale:
CI meas = -0.101 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = -0.3 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2683,KPDmeas = 0.2272,KC = 0.2064 Ncalc = 1.41 - 1.5
Optical Data:
Uniaxial (+), w=1.53-1.536, e=1.532-1.538, bire=0.0020.
Calculated Properties of Apophyllite-(KF)
Electron Density:
Bulk Density (Electron Density)=2.34 gm/cc note: Specific Gravity of Apophyllite-(KF) =2.35 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEApophyllite-(KF) = 4.17 barns/electronU=PEApophyllite-(KF) x r electron = 9.77 barns/cc.
Radioactivity:
GRapi = 62.81 (Gamma Ray American Petroleum Institute Units)
Concentration of Apophyllite-(KF) per GRapi unit = 1.59 (%)
Estimated Radioactivity from Apophyllite-(KF) - barely detectable
Apophyllite-(KF) Classification
Dana Class:
72.03.01.01 (72) Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
(72.03) with 3-, 4-, or 5-membered rings and 8-membered rings
(72.03.01) Apophyllite group (4- & 8-membered rings)
72.03.01.00 Apophyllite * KCa4(Si4O10)2F•8(H2O) P 4/mnc 4/m 2/m 2/m
72.03.01.01 Apophyllite-(KF) (K,Na)Ca4Si8O20(F,OH)•8(H2O) P 4/mnc 4/m 2/m 2/m
72.03.01.02 Apophyllite-(KOH) KCa4Si8O20(OH,F)•8(H2O) P 4/mnc 4/m 2/m 2/m
72.03.01.03 Apophyllite-(NaF) NaCa4Si8O20F•8(H2O) Pnnm 2/m 2/m 2/m
72.03.01.04 Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)•(H2O) P 4/mbm 4/m 2/m 2/m
Strunz Class:
09.EA.15 09 - SILICATES (Germanates)
09.E - Phyllosilicates
09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
09.EA.15 Apophyllite * KCa4(Si4O10)2F•8(H2O) P 4/mnc 4/m 2/m 2/m
09.EA.15 Apophyllite-(KOH) KCa4Si8O20(OH,F)•8(H2O) P 4/mnc 4/m 2/m 2/m
09.EA.15 Apophyllite-(KF) (K,Na)Ca4Si8O20(F,OH)•8(H2O) P 4/mnc 4/m 2/m 2/m
09.EA.15 Apophyllite-(NaF) NaCa4Si8O20F•8(H2O) Pnnm 2/m 2/m 2/m
Other Apophyllite-(KF) Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
See Also:
Links to other databases for Apophyllite-(KF) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Apophyllite-(KF)
(K,Na)Ca4Si8O20(F,OH)•8(H2O)
Dana No: 72.03.01.01 Strunz No: 09.EA.15
Locality:
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