Clinobarylite Mineral Data

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Clinobarylite Mineral Data

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

Clinobarylite Image

Images:

Clinobarylite

Comments: Radiating group of colorless flattened bladed clinobarylite crystals.
Location: Hackmann Valley, Yukspor Mountain, Khibiny, Kola, Russia. Scale: See Image.
© Rruff Database

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

Diaphaneity:

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
Ncalc = 1.69 - 1.71

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:

Bulk Density (Electron Density)=3.71 gm/cc
note: Specific Gravity of Clinobarylite =4.06 gm/cc.

Fermion Index:

Fermion Index = 0.13
Boson Index = 0.87

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Clinobarylite is Not Radioactive

Clinobarylite Classification

Dana Class:

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

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

(55.01.02)Dana Group

55.01.02.01 Clinobarylite! BaBe2Si2O7 Pmn2 2/m 2/m 2/m

Strunz Class:

09.BB.15 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BB -Si2O7 groups, without non-tetrahedral anions;

09.BB.15 Barylite BaBe2Si2O7 Pn21a mm2

09.BB.15 Clinobarylite! BaBe2Si2O7 Pmn2 2/m 2/m 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Clinobarylite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Clinobarylite

BaBe2Si2O7
Dana No: 55.01.02.01 Strunz No: 09.BB.15
Locality:

Notes: