Hyalotekite Mineral Data

Hyalotekite Mineral Data +

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General Hyalotekite Information

Chemical Formula:

(Ba,Pb,Ca,K)6(B,Si,Al)2(Si,Be)10O28(F,Cl)

Composition:

Molecular Weight = 1,595.98 gm

Potassium 1.47 % K 1.77 % K₂O

Barium 25.81 % Ba 28.82 % BaO

Calcium 3.01 % Ca 4.22 % CaO

Beryllium 1.41 % Be 3.92 % BeO

Aluminum 0.34 % Al 0.64 % Al₂O₃

Silicon 14.25 % Si 30.49 % SiO₂

Boron 0.81 % B 2.62 % B₂O₃

Lead 23.37 % Pb 25.17 % PbO

Chlorine 0.56 % Cl 0.56 % Cl

- % Cl -0.13 % -O=Cl₂

Oxygen 28.07 % O

Fluorine 0.89 % F 0.89 % F

- % F -0.38 % -O=F₂

______ ______

100.00 % 98.60 % = TOTAL OXIDE

Empirical Formula:

Ba₃Pb_1.8Ca_1.2K_0.6B_1.2Si_0.6Al_0.2Si_7.5Be_2.5O₂₈F_0.75Cl_0.25

IMA Status:

Valid Species (Pre-IMA) 1877

Locality:

Langbanshyttan, Vermland, Sweden. Link to MinDat.org Location Data.

Synonym:

ICSD 31186

PDF 19-572

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Hyalotekite Crystallography

Axial Ratios:

a:b:c =1.0324:1:0.9417

Cell Dimensions:

a = 11.31, b = 10.955, c = 10.317, Z = 2; alpha = 90.43°, beta = 90.02°, gamma = 90.16° V = 1,278.25 Den(Calc)= 4.15

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: I1

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

By Intensity(I/I_o): 3.45(1), 2.94(0.8), 3.53(0.8),

Crystal Structure:

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Moore P B , Araki T , Ghose S , American Mineralogist , 67 (1982) p.1012-1020, Hyalotekite, a complex lead borosilicate: Its crystal structure and the, lone-pair effect of Pb(II)

Physical Properties of Hyalotekite

Cleavage:

[???] Good, [???] Good

Color:

White, Pearly gray.

Density:

3.81

Diaphaniety:

Translucent to subtranslucent

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Hyalotekite

Gladstone-Dale:

CI meas= -0.537 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.411 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2323,KPDmeas= 0.253,KC= 0.1647

Optical Data:

Biaxial (+), a=1.963, b=1.963, g=1.966, bire=0.0030, 2V(Calc)=0, 2V(Meas)=small. Dispersion strong, r < v.

Calculated Properties of Hyalotekite

Electron Density:

r_electron=3.73 gm/cc
note: r_Hyalotekite=4.15 gm/cc.

Fermion Index

Fermion Index = 0.12021
Boson Index = 0.87979

Photoelectric:

PE_Hyalotekite= 514.95 barns/electron
U=PE_Hyalotekite x r_electron=1,922.82 barns/cc.

Radioactivity:

GRapi = 19.07 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Hyalotekite - barely detectable

Hyalotekite Classification

Dana Class:

78.6.1.1 (78)Unclassified silicates

(78.6)possible tectosilicates

(78.6.1)Dana Group

78.6.1.1 Hyalotekite (Ba,Pb,Ca,K)6(B,Si,Al)2(Si,Be)10O28(F,Cl) I1 1

78.6.1.2 Kapitsaite-(Y)! (Ba,K,Pb,Na)4(Y,Ca,REE)2[Si8B2(B,Si)2O28F] I1 1

Strunz Class:

VIII/E.11-10 VIII - Silicates

VIII/E - Cyklosilicates, combination of quadruplet rings and groups.

VIII/E.11 - Hyalotekite series

VIII/E.11-10 Hyalotekite (Ba,Pb,Ca,K)6(B,Si,Al)2(Si,Be)10O28(F,Cl) I1 1

VIII/E.11-20 Kapitsaite-(Y)! (Ba,K,Pb,Na)4(Y,Ca,REE)2[Si8B2(B,Si)2O28F] I1 1

Other Hyalotekite Information

References:

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

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Hyalotekite

(Ba,Pb,Ca,K)6(B,Si,Al)2(Si,Be)10O28(F,Cl)
Dana No: 78.6.1.1 Strunz No: VIII/E.11-10
Locality:

Notes: