Barylite Mineral Data

Barylite Mineral Data +

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General Barylite Information

Chemical Formula:

BaBe2Si2O7

Composition:

Molecular Weight = 323.52 gm

Barium 42.45 % Ba 47.39 % BaO

Beryllium 5.57 % Be 15.46 % BeO

Silicon 17.36 % Si 37.14 % SiO₂

Oxygen 34.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaBe₂(Si₂O₇)

Environment:

Alkalic pegmatites and miarolitic cavities. Also in nephelene syenites and other alkalic intrusions.

IMA Status:

Valid Species (Pre-IMA) 1876

Locality:

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

Name Origin:

Named from the Greek for "heavy", in allusion to its high specific gravity.

Synonym:

ICSD 24-615

PDF 20-119

Barylite Image

Images:

Barylite

Comments: Prismatic crystals of barylite exposed in a vug.
Location: Eveslogchorr Mt , Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Barylite

Comments: Blocky prisimatic clear crystals of barylite with black aegirine.
Location: Mt. Malosa, Zomba plateau Malawi. Scale: 2 x 1.6 x 1.3 cm.
© Fabre Minerals

Barylite Crystallography

Axial Ratios:

a:b:c =0.8429:1:0.4011

Cell Dimensions:

a = 9.82, b = 11.65, c = 4.673, Z = 4; V = 534.61 Den(Calc)= 4.02

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pn21a

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

By Intensity(I/I_o): 2.92(1), 3.38(1), 3.02(0.8),

Crystal Structure:

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Robinson P D , Fang J H , American Mineralogist , 62 (1977) p.167-169, Barylite, BaBe2Si2O7: its space group and crystal structure, Locality: amazonite pocket, Park County, Colorado, USA

Physical Properties of Barylite

Cleavage:

[001] Perfect, [100] Perfect

Color:

Bluish, Colorless, White.

Density:

4.02 - 4.07, Average = 4.04

Diaphaniety:

Transparent

Fracture:

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

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

6-7 - Orthoclase-Quartz

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Barylite

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1729,KPDmeas= 0.1718,KC= 0.175

Optical Data:

Biaxial (-), a=1.69, b=1.69-1.7, g=1.7, bire=0.0100, 2V(Calc)=0, 2V(Meas)=40.45. Dispersion weak to moderate, r > v.

Calculated Properties of Barylite

Electron Density:

r_electron=3.68 gm/cc
note: r_Barylite=4.02 gm/cc.

Fermion Index

Fermion Index = 0.13963
Boson Index = 0.86037

Photoelectric:

PE_Barylite= 186.73 barns/electron
U=PE_Barylite x r_electron= 686.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Barylite is Not Radioactive

Barylite Classification

Dana Class:

55.1.1.1 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.1)with cations in [4] and higher coordination

(55.1.1)Dana Group

55.1.1.1 Barylite BaBe2Si2O7 Pn21a mm2

Strunz Class:

VIII/C.02-80 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.02 - Melilite group

VIII/C.02-10 Akermanite Ca2MgSi2O7 P 42₁m 4 2m

VIII/C.02-14 Okayamalite! Ca2B2SiO7 P 42₁m 4 2m

VIII/C.02-15 Gehlenite Ca2Al(AlSi)O7 P 42₁m 4 2m

VIII/C.02-30 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

VIII/C.02-40 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

VIII/C.02-50 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

VIII/C.02-60 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

VIII/C.02-70 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

VIII/C.02-80 Barylite BaBe2Si2O7 Pn21a mm2

VIII/C.02-85 Clinobarylite! BaBe2Si2O7 Pmn2 2/m 2/m 2/m

VIII/C.02-90 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 2₁/c 2/m

Other Barylite Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Barylite

BaBe2Si2O7
Dana No: 55.1.1.1 Strunz No: VIII/C.02-80
Locality:

Notes: