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Apophyllite-(NaF) Mineral Data

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General Apophyllite-(NaF) Information

Help on Chemical  Formula: Chemical Formula: NaCa4Si8O20F•8(H2O)
Help on Composition: Composition: Molecular Weight = 891.09 gm
   Sodium     2.58 %  Na    3.48 % Na2O
   Calcium   17.99 %  Ca   25.17 % CaO
   Silicon   25.21 %  Si   53.94 % SiO2
   Hydrogen   1.81 %  H    16.17 % H2O
   Oxygen    50.27 %  O
   Fluorine   2.13 %  F     2.13 % F
               -   %   F    -0.90 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCa4Si8O20F•8(H2O)
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek apophylliso - "it flakes off" and the composition.
Help on Name Pronunciation: Name Pronunciation: Apophyllite-(NaF) + Pronunciation Say APOPHYLLITE-(NAF)
Help on Synonym: Synonym: Natroapophyllite - Renamed to Apophyllite-(NaF) by Mineralogical Record, v39, (2008), p 131

Apophyllite-(NaF) Image

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Comments: Pale pink opaque blocky crystal natroapophyllite aggregate.
Location: Boghil Quarry, Glengormley, Newtownabbey, County Antrim, Northern Ireland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Apophyllite-(NaF) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9993:1:1.7779
Help on Cell Dimensions: Cell Dimensions: a = 8.875, b = 8.881, c = 15.79, Z = 2; V = 1,244.55 Den(Calc)= 2.38
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.96(1), 2.98(0.63), 7.83(0.2),

Physical Properties of Apophyllite-(NaF)

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 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-(NaF)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2266,KPDmeas= 0.2295,KC= 0.2277
Ncalc = 1.52 - 1.55
Help on Optical Data: Optical Data: Biaxial (+), a=1.536, b=1.538, g=1.544, bire=0.0080, 2V(Calc)=62, 2V(Meas)=32.

Calculated Properties of Apophyllite-(NaF)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.41 gm/cc
note: Specific Gravity of Apophyllite-(NaF) =2.38 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEApophyllite-(NaF) = 3.23 barns/electron
U=PEApophyllite-(NaF) x rElectron Density= 7.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Apophyllite-(NaF) is Not Radioactive

Apophyllite-(NaF) 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-(NaF) Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Apophyllite-(NaF) :
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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