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Corundum Mineral Data
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General Corundum Information
Help on Chemical Formula: Chemical Formula: Al2O3
Help on Composition: Composition: Molecular Weight = 101.96 gm
   Aluminum  52.93 %  Al  100.00 % Al2O3
   Oxygen    47.07 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (Al2O3)
Help on Environment: Environment: Contact and regionally metamorphosed rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) Prehistoric
Help on Locality: Locality: Tchainit and Yakutia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Probably derived from the Sanskrit, kuruvinda, meaning "ruby."
Help on Synonym: Synonym: ICSD 31545
  Leucosapphire - colorless
  PDF 43-1484
  Ruby - red
  Sapphire - blue
 

Corundum Image

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Corundum

Comments: corundum (variety Sapphire).
Location: Miass, Urals, Russia. Scale: 10 x 8 cm.
© Fabre Minerals
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Corundum   Zincohogbomite-2N2S

Comments: Thin-Section (Plane Polarized Light) of a brown, twinned zincohögbomite-2N2S crystal with blue corundum.
Location: Mikro-Lakka Emery deposit, Kerketeas Mt, Sámos Island, Aegean Islands Department, Greece. Scale: Picture size 1.1 mm.
© Thomas Witzke / Abraxas-Verlag
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Corundum

Comments: Bright red ruby corundum crystals in white marble matrix.
Location: Jagdalak (Jagdalek; Jagdalik) Ruby Mine, Sorobi District, Konar (Kunar; Konarh; Konarha; Nuristan) Province, Afghanistan. Scale: 4x3.5x3 cm.
© John Betts - Fine Minerals

Corundum Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:2.72995
Help on Cell Dimensions: Cell Dimensions: a = 4.751, c = 12.97, Z = 6; V = 253.54 Den(Calc)= 4.01
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.085(1), 2.552(0.9), 1.601(0.8),
Help on Forms: Forms:

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Forms: [ 1 1 4] [ 2 0 1] [ 1 0 2] [ 1 0 1] [ 0 0 1]

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Lewis J , Schwarzenbach D , Flack H D , Acta Crystallographica, Section A , 38 (1982) p.733-739, Electric field gradients and charge density in corundum alpha-Al2O3

View Additional jPOWD Structure files for Corundum
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Corundum

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue, Red, Yellow, Brown, Gray.
Help on Density: Density: 4 - 4.1, Average = 4.05
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Tough - Difficult to break apart as shown by fibrous minerals and most metals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
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 Hardness: Hardness: 9 - Corundum
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: none
 

Optical Properties of Corundum

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.08 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1905,KPDmeas= 0.1886,KC= 0.207
Help on Optical Data: Optical Data: Uniaxial (-), e=1.76, w=1.768, bire=0.0080.
 

Calculated Properties of Corundum

Help on Electron Density: Electron Density:

relectron=3.93 gm/cc
note: rCorundum =4.01 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00022
Boson Index = 0.99978
Help on Photoelectric: Photoelectric:

PECorundum = 1.54 barns/electron
U=PECorundum x relectron= 6.08 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Corundum is Not Radioactive
 

Corundum Classification
Help on Dana Class: Dana Class: 4.3.1.1 (4)Simple Oxides
  (4.3)with a cation charge of 3+ (A+++2 O3)
  (4.3.1)Corundum-Hematite group (Rhombohedral: R3Żc)
 
4.3.1.1 Corundum Al2O3 R 3c 3 2/m
 
4.3.1.2 Hematite Fe2O3 R 3c 3 2/m
 
4.3.1.3 Eskolaite Cr2O3 R 3c 3 2/m
 
4.3.1.4 Karelianite V2O3 R 3c 3 2/m
Help on Strunz Class: Strunz Class: IV/C.04-10 IV - Oxides
  IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
  IV/C.04 - Hematite group
 
IV/C.04-10 Corundum Al2O3 R 3c 3 2/m
 
IV/C.04-20 Hematite Fe2O3 R 3c 3 2/m
 
IV/C.04-30 Eskolaite Cr2O3 R 3c 3 2/m
 
IV/C.04-40 Karelianite V2O3 R 3c 3 2/m
 

Other Corundum Information
Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)
Help on See Also: See Also: Links to other databases for Corundum :
1 - Alkali-Nuts(English) 2 -Am. Min. Crystal Structure Database 3 - Amethyst Galleries' Mineral Gallery 4 - Applied Mineralogy 5 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - Crocoite.com Mineral Locations 9 - Franklin Minerals(Dunn) 10 - Franklin Minerals(Palache) 11 - Glendale Community College 12 -Google Images 13 -Google Scholar 14 -Handbook of Mineralogy (UofA) 15 -MinDAT 16 -MinMax(Deutsch) 17 -MinMax(English) 18 - Mineral and Gemstone Kingdom 19 - Mineral and Gemstone Kingdom 20 -Mineralienatlas (Deutsch) 21 - Minerals of Wisconsin 22 -NSDL Reciprocal Net (JAVA) 23 - Philatelic Mineralogy 24 -QUT Mineral Atlas 25 - Scandinavian mineral gallery 26 - Tradeshop.com - The Rainbow of Gems 27 - UCLA - Petrography Thin-Sections 28 -University of Colorado - Mineral Structure Data 29 -University of Minnesota 30 -University of Texas at Austin 31 - WWW-MINCRYST

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Corundum

Al2O3
Dana No: 4.3.1.1 Strunz No: IV/C.04-10
Locality:

 

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