Fluorapophyllite Mineral Data

Fluorapophyllite Mineral Data +

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General Fluorapophyllite Information

Chemical Formula:

(K,Na)Ca4Si8O20(F,OH)·8(H2O)

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

Empirical Formula:

K_0.85Na_0.15Ca₄Si₈O₂₀F_0.9(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;

Synonym:

Apophyllite

ICSD 49904

PDF 19-82

Fluorapophyllite Image

Images:

Click Here for Larger Fluorapophyllite Image

Fluorapophyllite Stilbite Apophyllite

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

Fluorapophyllite 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 DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Crystal Structure:

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Colville A A , Anderson C P , Black P M , American Mineralogist , 56 (1971) p.1222-1233, Refinement of the crystal structure of apophyllite I. X-ray diffraction and, physical properties

View Additional jPOWD Structure files for Fluorapophyllite
[1] [2] [3]

Physical Properties of Fluorapophyllite

Cleavage:

[001] Perfect

Color:

White, Pink, Green, Yellow, Violet.

Density:

2.3 - 2.4, Average = 2.34

Diaphaniety:

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:

None.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Fluorapophyllite

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

Optical Data:

Uniaxial (+), w=1.53-1.536, e=1.532-1.538, bire=0.0020.

Calculated Properties of Fluorapophyllite

Electron Density:

r_electron=2.34 gm/cc
note: r_{Fluorapophyllite}=2.35 gm/cc.

Fermion Index

Fermion Index = 0.01429
Boson Index = 0.98571

Photoelectric:

PE_{Fluorapophyllite}= 4.17 barns/electron
U=PE_{Fluorapophyllite} x r_electron= 9.77 barns/cc.

Radioactivity:

GRapi = 62.81 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Fluorapophyllite - barely detectable

Fluorapophyllite Classification

Dana Class:

72.3.1.1 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.3)with 3-, 4-, or 5-membered rings and 8-membered rings

(72.3.1)Apophyllite group (4- & 8-membered rings)

72.3.1.0 Apophyllite* KCa4(Si4O10)2F·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.1 Fluorapophyllite (K,Na)Ca4Si8O20(F,OH)·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.2 Hydroxyapophyllite KCa4Si8O20(OH,F)·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.3 Natroapophyllite NaCa4Si8O20F·8(H2O) Pnnm 2/m 2/m 2/m

72.3.1.4 Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O) P 4/mbm 4/m 2/m 2/m

Strunz Class:

VIII/H.01-20 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.01 - Apophyllite series

VIII/H.01-10 Natroapophyllite NaCa4Si8O20F·8(H2O) Pnnm 2/m 2/m 2/m

VIII/H.01-20 Fluorapophyllite (K,Na)Ca4Si8O20(F,OH)·8(H2O) P 4/mnc 4/m 2/m 2/m

VIII/H.01-30 Hydroxyapophyllite KCa4Si8O20(OH,F)·8(H2O) P 4/mnc 4/m 2/m 2/m

Other Fluorapophyllite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

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Fluorapophyllite

(K,Na)Ca4Si8O20(F,OH)·8(H2O)
Dana No: 72.3.1.1 Strunz No: VIII/H.01-20
Locality:

Notes: