Hyalophane Mineral Data

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."

Name Pronunciation:

Hyalophane + Pronunciation

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

Diaphaneity:

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:

Non-fluorescent.

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
Ncalc = 1.54 - 1.55

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:

Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Hyalophane =2.81 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

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)
Concentration of Hyalophane per GRapi unit = 0.74 (%)

Estimated Radioactivity from Hyalophane - barely detectable

Hyalophane Classification

Dana Class:

76.01.01.03 (76)Tectosilicate Al-Si Framework

(76.01)with Al-Si frameworks

(76.01.01)K (Na,Ba) feldspars

76.01.01.01 Orthoclase KAlSi3O8 C 2/m 2/m

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

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

76.01.01.04 Celsian BaAl2Si2O8 I21/c 2/m

76.01.01.05 Microcline KAlSi3O8 C1 1

76.01.01.06 Anorthoclase (Na,K)AlSi3O8 C1 1

76.01.01.07 Rubicline! (Rb,K)AlSi3O8 P1 1

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

Strunz Class:

09.FA.30 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1

09.FA.30 Buddingtonite (NH4)AlSi3O8•0.5(H2O) P 2₁ or P 2₁/m Mono

09.FA.30 Celsian BaAl2Si2O8 I21/c 2/m

09.FA.30 Anorthoclase (Na,K)AlSi3O8 C1 1

09.FA.30 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m

09.FA.30 Orthoclase KAlSi3O8 C 2/m 2/m

09.FA.30 Microcline KAlSi3O8 C1 1

09.FA.30 Rubicline! (Rb,K)AlSi3O8 P1 1

09.FA.30 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

Other Hyalophane Information

References:

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

See Also:

Links to other databases for Hyalophane :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Hyalophane Specimen Label here :

Hyalophane

(K,Ba)Al(Si,Al)3O8
Dana No: 76.01.01.03 Strunz No: 09.FA.30
Locality:

Notes: