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Apophyllite-(KF) Mineral Data

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General Apophyllite-(KF) Information

Help on Chemical  Formula: Chemical Formula: (K,Na)Ca4Si8O20(F,OH)•8(H2O)
Help on Composition: Composition: Molecular Weight = 760.47 gm
   Potassium   4.37 %  K     5.26 % K2O
   Sodium      0.45 %  Na    0.61 % Na2O
   Calcium    21.08 %  Ca   29.50 % CaO
   Silicon    29.55 %  Si   63.21 % SiO2
   Hydrogen    0.01 %  H     0.12 % H2O
   Oxygen     42.29 %  O
   Fluorine    2.25 %  F     2.25 % F
                -   %   F    -0.95 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.85Na0.15Ca4Si8O20F0.9(OH)0.1
Help on Environment: Environment: A secondary mineral in amygdules or druses in basalts. A late-stage mineral in some mineral deposits.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Poona, Nasik, and Bombay districts, Maharashtra, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek apophylliso - "it flakes off." and the composition containing fluorine;
Help on Name Pronunciation: Name Pronunciation: Apophyllite-(KF) + Pronunciation Say APOPHYLLITE-(KF)
Help on Synonym: Synonym: Fluorapophyllite - Renamed to Apophyllite-(F) by Mineralogical Record, v39, (2008), p 131

Apophyllite-(KF) Image

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  Apophyllite-(KF)   Stilbite-Ca   Apophyllite

Comments: Doubly terminated, very clear and perfect fluorapophyllite with white stilbite.
Location: Jalgaon, India. Scale: 4 x 3.5 cm.
© Fabre Minerals

Apophyllite-(KF) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.76324
Help on Cell Dimensions: Cell Dimensions: a = 8.963, c = 15.804, Z = 2; V = 1,269.62 Den(Calc)= 1.99
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnc
Help on X Ray Diffraction: 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)

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: White, Pink, Green, Yellow, Violet.
Help on Density: Density: 2.3 - 2.4, Average = 2.34
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Apophyllite-(KF)

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.53-1.536, e=1.532-1.538, bire=0.0020.

Calculated Properties of Apophyllite-(KF)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.34 gm/cc
note: Specific Gravity of Apophyllite-(KF) =2.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEApophyllite-(KF) = 4.17 barns/electron
U=PEApophyllite-(KF) x relectron= 9.77 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (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) Apophyllite* KCa4(Si4O10)2F•8(H2O) P 4/mnc 4/m 2/m 2/m Apophyllite-(KF) (K,Na)Ca4Si8O20(F,OH)•8(H2O) P 4/mnc 4/m 2/m 2/m Apophyllite-(KOH) KCa4Si8O20(OH,F)•8(H2O) P 4/mnc 4/m 2/m 2/m Apophyllite-(NaF) NaCa4Si8O20F•8(H2O) Pnnm 2/m 2/m 2/m Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)•(H2O) P 4/mbm 4/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: 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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Dana No: Strunz No: 09.EA.15





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