Mineralogy Database

Chrysoberyl Mineral Data

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General Chrysoberyl Information

Help on Chemical  Formula: Chemical Formula: BeAl2O4
Help on Composition: Composition: Molecular Weight = 126.97 gm
   Beryllium   7.10 %  Be   19.70 % BeO
   Aluminum   42.50 %  Al   80.30 % Al2O3
   Oxygen     50.40 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BeAl2O4
Help on Environment: Environment: Granitic pegmatite dikes.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1790
Help on Locality: Locality: Takowaja, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek chrysos - "golden" and the mineral beryl.
Help on Name Pronunciation: Name Pronunciation: Chrysoberyl + Pronunciation Say CHRYSOBERYL
Help on Synonym: Synonym: Alexandrite - green
  ICSD 62501
  PDF 11-448

Chrysoberyl Image

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Comments: Chrysoberyl (alexandrite) sixling twin crystal.
Location: Zimbabwe. Scale: Crystal size 2.3 cm.
© Richard Dale / Dale Minerals

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Comments: Chrysoberyl (Alexandrite) crystal on matrix with excellent color change (Daylight, Tungsten Bulb).
Location: Malyshevo, Yekaterina Oblast', Urals, Russia. Scale: Crystal size 1.2 cm.
© Kevin Ward

Chrysoberyl Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5823:1:0.4707
Help on Cell Dimensions: Cell Dimensions: a = 5.476, b = 9.404, c = 4.427, Z = 4; V = 227.97 Den(Calc)= 3.70
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmnb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.24(1), 2.091(0.9), 1.619(0.8),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 2 1) ( 0 1 1) ( 1 1 1) ( 1 1 0) ( 1 0 0)

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Physical Properties of Chrysoberyl

Help on Cleavage: Cleavage: {110} Distinct, {010} Imperfect, {???} Imperfect
Help on Color: Color: Blue green, Brown, Brownish green, Green, Gray.
Help on Density: Density: 3.5 - 3.84, Average = 3.67
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 8.5 - Chrysoberyl
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Chrysoberyl

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2024,KPDmeas= 0.2041,KC= 0.2135
Ncalc = 1.75 - 1.82
Help on Optical Data: Optical Data: Biaxial (+), a=1.745, b=1.748, g=1.754, bire=0.0090, 2V(Calc)=72, 2V(Meas)=45. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.

Calculated Properties of Chrysoberyl

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Chrysoberyl =3.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEChrysoberyl = 1.31 barns/electron
U=PEChrysoberyl x rElectron Density= 4.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chrysoberyl is Not Radioactive

Chrysoberyl Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.02)(A+ B++)2 X4 Spinel group
  (07.02.09)Dana Group Chrysoberyl BeAl2O4 Pmnb 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.BA.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.B - Metal:Oxygen = 3:4 and similar
  04.BA -With small and medium-sized cations
04.BA.05 Chrysoberyl BeAl2O4 Pmnb 2/m 2/m 2/m

Other Chrysoberyl Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Chrysoberyl :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineral and Gemstone Kingdom
14 - Mineralienatlas (Deutsch)
15 - NSDL Reciprocal Net (JAVA)
16 - Online Mineral Museum
17 - Philatelic Mineralogy
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - Scandinavian mineral gallery
21 - Tradeshop.com - The Rainbow of Gems

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Dana No: Strunz No: 04.BA.05





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