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General Kornerupine Information  
  Chemical Formula:   (Mg,Fe++)4(Al,Fe+++)6(SiO4,BO4)5(O,OH)2  

Composition:

Molecular Weight = 649.39 gm

 

 Magnesium  13.10 %  Mg   21.72 % MgO

 

 Aluminum   23.68 %  Al   44.75 % Al2O3

 

 Iron        1.72 %  Fe    2.21 % FeO

 

 Silicon    16.00 %  Si   34.23 % SiO2

 

 Boron       0.50 %  B     1.61 % B2O3

 

 Hydrogen    0.16 %  H     1.39 % H2O

 

 Oxygen     44.84 %  O

 

           ______        ______ 

 

           100.00 %      105.91 % = TOTAL OXIDE

Empirical Formula:

Mg3.5Fe2+0.2Al5.7(SiO4)3.7(BO4)0.3O1.2(OH)

Environment:

Metamorphic and alluvial rocks.

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

Fiskernaes, SW Greenland. Madagascar

Name Origin:

Named after the Danish geologist, A. N. Kornerup (1857-1881).

Synonym:

ICSD 68636

 

PDF 29-852

 

Prismatine

  Kornerupine Image

 

    Kornerupine (22 grms.)

Comments: Greenish blue crystal prism of kornerupine.
Location: Madagascar.

Image by A. Darbellay

Kornerupine Crystallography  
  Axial Ratios:   a:b:c =1.1669:1:0.4885  

Cell Dimensions:

a = 16.041, b = 13.746, c = 6.715, Z = 4; V = 1,480.65 Den(Calc)= 2.91

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mcm

X Ray Diffraction:

By Intensity(I/Io): 2.62(1), 3.008(1), 2.104(0.6),

Physical Properties of Kornerupine

 Cleavage:  [110] Indistinct  

Color:

Brown, Colorless, Green, Greenish yellow, Yellow.

Density:

3.3 - 3.34, Average = 3.32

Diaphaniety:

Translucent to opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

7 - Quartz

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

        >>  Faceted Kornerupine
 
 
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