Mineralogy Database

Barylite Mineral Data

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General Barylite Information

Help on Chemical  Formula: Chemical Formula: BaBe2Si2O7
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: BaBe2(Si2O7)
Help on Environment: Environment: Alkalic pegmatites and miarolitic cavities. Also in nephelene syenites and other alkalic intrusions.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1876
Help on Locality: Locality: Langbanshyttan, Vermland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for "heavy", in allusion to its high specific gravity.
Help on Name Pronunciation: Name Pronunciation: Barylite Say BARYLITE
Help on Synonym: Synonym: ICSD 24-615
  PDF 20-119

Barylite Image

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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

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.8429:1:0.4011
Help on Cell Dimensions: Cell Dimensions: a = 9.82, b = 11.65, c = 4.673, Z = 4; V = 534.61 Den(Calc)= 4.02
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-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),

Physical Properties of Barylite

Help on Cleavage: Cleavage: {001} Perfect, {100} Perfect
Help on Color: Color: Bluish, Colorless, White.
Help on Density: Density: 4.02 - 4.07, Average = 4.04
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Barylite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Barylite =4.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PEBarylite = 186.73 barns/electron
U=PEBarylite x rElectron Density= 686.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barylite is Not Radioactive

Barylite Classification

Help on  Dana Class: Dana Class: (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.01)with cations in [4] and higher coordination
  (55.01.01)Dana Group Barylite BaBe2Si2O7 Pn21a mm2
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Barylite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Dunn)
8 - Franklin Minerals(Palache)
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info

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Dana No: Strunz No: 09.BB.15





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