Barylite Mineral Data (original) (raw)

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.

Name Pronunciation:

Barylite

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/Io): 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

Diaphaneity:

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
Ncalc = 1.7 - 1.71

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:

Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Barylite =4.02 gm/cc.

Fermion Index:

Fermion Index = 0.13
Boson Index = 0.87

Photoelectric:

PEBarylite = 186.73 barns/electron
U=PEBarylite x rElectron Density= 686.81 barns/cc.

Radioactivity:

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

Barylite Classification

Dana Class:

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

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

(55.01.01)Dana Group

55.01.01.01 Barylite BaBe2Si2O7 Pn21a mm2

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 Barylite Information

References:

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

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

Barylite

BaBe2Si2O7
Dana No: 55.01.01.01 Strunz No: 09.BB.15
Locality:

Notes: