Hyalophane Mineral Data

Hyalophane Mineral Data +

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General Hyalophane Information

Chemical Formula:

(K,Ba)Al(Si,Al)3O8

Composition:

Molecular Weight = 302.06 gm

Potassium 9.71 % K 11.69 % K₂O

Barium 11.37 % Ba 12.69 % BaO

Aluminum 15.63 % Al 29.54 % Al₂O₃

Silicon 20.92 % Si 44.76 % SiO₂

Oxygen 42.37 % O

______ ______

100.00 % 98.68 % = TOTAL OXIDE

Empirical Formula:

K_0.75Ba_0.25Al_1.75Si_2.25O₈

Environment:

Magmatic and contact metamorphic.

IMA Status:

Valid Species (Pre-IMA) 1855

Locality:

Imfield, Switzerland. Link to MinDat.org Location Data.

Name Origin:

From the Greek hyalos - "glass" and phanos - "to appear."

Synonym:

ICSD 31192

PDF 19-3

Hyalophane Image

Images:

Hyalophane

Comments: Twinned crystal of hyalophane slightly yellow from iron stains.
Location: Sarajevo, Bosnia, Yugoslavia. Scale: 4 x 3 cm.
© Isaias Casanova / IC Minerals

Hyalophane Crystallography

Axial Ratios:

a:b:c =0.6579:1:0.5513

Cell Dimensions:

a = 8.52, b = 12.95, c = 7.14, Z = 4; beta = 116° V = 708.06 Den(Calc)= 2.83

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.24(1), 3.31(0.9), 3(0.7),

Crystal Structure:

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Viswanathan K , Kielhorn H M , American Mineralogist , 68 (1983) p.122-124, Al,Si distribution in a ternary (Ba,K,Na)-feldspar as determined by crystal, structure refinement, Celsian-rich

Physical Properties of Hyalophane

Cleavage:

[001] Perfect, [010] Imperfect

Color:

Colorless, Yellow, White, Red.

Density:

2.81

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luminescence:

None.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Hyalophane

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1925,KPDmeas= 0.1938,KC= 0.1934

Optical Data:

Biaxial (-), a=1.542, b=1.545, g=1.547, bire=0.0050

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Hyalophane

Electron Density:

r_electron=2.73 gm/cc
note: r_Hyalophane=2.81 gm/cc.

Fermion Index

Fermion Index = 0.03024
Boson Index = 0.96976

Photoelectric:

PE_Hyalophane= 49.24 barns/electron
U=PE_Hyalophane x r_electron= 134.23 barns/cc.

Radioactivity:

GRapi = 135.85 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Hyalophane - barely detectable

Hyalophane Classification

Dana Class:

76.1.1.3 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.1)K (Na,Ba) feldspars

76.1.1.1 Orthoclase KAlSi3O8 C 2/m 2/m

76.1.1.2 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

76.1.1.3 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

76.1.1.4 Celsian BaAl2Si2O8 I21/c 2/m

76.1.1.5 Microcline KAlSi3O8 C1 1

76.1.1.6 Anorthoclase (Na,K)AlSi3O8 C1 1

76.1.1.7 Rubicline! (Rb,K)AlSi3O8 P1 1

76.1.1.8 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m

Strunz Class:

VIII/J.06-50 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.06 - Feldspar group, Buddingtonite - Orthoclase - Slawsonite series

VIII/J.06-10 Buddingtonite (NH4)AlSi3O8·0.5(H2O) P 2₁ or P 2₁/m Mono

VIII/J.06-15 Kokchetavite! KAlSi3O8 P 6/mmm(?) 6/m 2/m 2/m

VIII/J.06-20 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

VIII/J.06-30 Microcline KAlSi3O8 C1 1

VIII/J.06-35 Rubicline! (Rb,K)AlSi3O8 P1 1

VIII/J.06-40 Orthoclase KAlSi3O8 C 2/m 2/m

VIII/J.06-50 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

VIII/J.06-60 Celsian BaAl2Si2O8 I21/c 2/m

VIII/J.06-70 Paracelsian BaAl2Si2O8 P 2₁/c 2/m

VIII/J.06-80 Slawsonite (Sr,Ca)Al2Si2O8 P 2₁/a 2/m

Other Hyalophane Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Hyalophane

(K,Ba)Al(Si,Al)3O8
Dana No: 76.1.1.3 Strunz No: VIII/J.06-50
Locality:

Notes: