Clinobarylite Mineral Data

Clinobarylite Mineral Data

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General Clinobarylite Information

Chemical Formula:

BaBe2Si2O7

Composition:

Molecular Weight = 327.37 gm

Barium 43.21 % Ba 48.24 % BaO

Beryllium 5.42 % Be 15.05 % BeO

Silicon 17.16 % Si 36.71 % SiO₂

Oxygen 34.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba_1.03Be_1.97(Si₂O₇)

Environment:

Alkaline pegmatite veins at Yukspor Mountain. Dimorphous with barylite; structure determined. Possible polytype barylite-2O.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Non-orthogonal dimorph of barylite.

Synonym:

IMA2002-015

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Clinobarylite Crystallography

Axial Ratios:

a:b:c =2.3669:1:0.9496

Cell Dimensions:

a = 11.65, b = 4.922, c = 4.674, Z = 2; V = 268.01 Den(Calc)= 4.06

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmn2

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

By Intensity(I/I_o): 2.458(1)(020), 2.929(0.58)(211), 3.388(0.56)(011),2.335(0.48)(002), 3.249(0.45)(111,111), 2.986(0.28)(301), 3.042(0.26)(310), 2.077(0.23)(320,112), 2.404(0.22)(120),

Crystal Structure:

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Krivovichev S V , Yakovenchuk V N , Armbruster T , Mikhailova Y , Pakhomovsky Y A , Neues Jahrbuch fur Mineralogie, Monatshefte , 2004 (2004) p.373-384, Clinobarylite, BaBe2Si2O7: Structure refinement, and revision of symmetry and, physical properties, Locality: Khibina alkaline massif, Kola Peninsula, Russia

Physical Properties of Clinobarylite

Cleavage:

[100] Perfect, [001] Very Good, [101] Very Good

Color:

Colorless.

Density:

3.97

Diaphaniety:

Transparent

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

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

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

6.5 - Pyrite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Clinobarylite

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1727,KPDmeas= 0.1767,KC= 0.1742

Optical Data:

Biaxial (+), a=1.695-1.698, b=1.7-1.702, g=1.705-1.708, bire=0.0100

Calculated Properties of Clinobarylite

Electron Density:

r_electron=3.71 gm/cc
note: r_{Clinobarylite}=4.06 gm/cc.

Fermion Index

Fermion Index = 0.13941
Boson Index = 0.86059

Photoelectric:

PE_{Clinobarylite}= 190.30 barns/electron
U=PE_{Clinobarylite} x r_electron= 705.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Clinobarylite is Not Radioactive

Clinobarylite Classification

Dana Class:

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

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

(55.1.2)Dana Group

55.1.2.1 Clinobarylite ! BaBe2Si2O7 Pmn2 2/m 2/m 2/m

Strunz Class:

VIII/C.02-85 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 Clinobarylite Information

References:

NAME( AmMin, 89:249) PHYS. PROP.(AmMin, 89:249, 90:522) OPTIC PROP.(AmMin, 89:249)

See Also:

Links to other databases for Clinobarylite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Clinobarylite

BaBe2Si2O7
Dana No: 55.1.2.1 Strunz No: VIII/C.02-85
Locality:

Notes: