Kornerupine Mineral Data

Kornerupine Mineral Data +

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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:

Mg_3.5Fe²⁺_0.2Al_5.7(SiO₄)_3.7(BO₄)_0.3O_1.2(OH)

Environment:

Metamorphic and alluvial rocks.

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

Fiskernaes, SW Greenland. Link to MinDat.org Location Data.

Name Origin:

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

Synonym:

ICSD 68636

PDF 29-852

Prismatine

Kornerupine Image

Images:

Kornerupine

Comments: Greenish gray mottled crystal prism of kornerupine.
Location: Western Hart's Range, Northern Territory, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

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

Crystal Structure:

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Moore P B , Sen Gupta P K , Schlemper E O , American Mineralogist , 74 (1989) p.642-655, Kornerupine: Chemical crystallography, comparative crystallography, and its, cation relation to olivine and to Ni2In intermetallic

View Additional jPOWD Structure files for Kornerupine
[1]

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

Optical Properties of Kornerupine

Gladstone-Dale:

CI meas= 0.075 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.2031,KC= 0.2196

Optical Data:

Biaxial (-), a=1.66-1.671, b=1.673-1.683, g=1.674-1.684, bire=0.0130-0.0140, 2V(Calc)=30-32, 2V(Meas)=3-48. Dispersion r > v or r < v.

Pleochroism (x):

colorless, green, or green.

Pleochroism (y):

colorless, pale brownish yellow, or pale yellowish green.

Pleochroism (z):

pale brownish green, green, or light amber.

Calculated Properties of Kornerupine

Electron Density:

r_electron=2.88 gm/cc
note: r_Kornerupine=2.91 gm/cc.

Fermion Index

Fermion Index = 0.02214
Boson Index = 0.97786

Photoelectric:

PE_Kornerupine= 2.09 barns/electron
U=PE_Kornerupine x r_electron= 6.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kornerupine is Not Radioactive

Kornerupine Classification

Dana Class:

58.1.1.1 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.1)with cations in [4] and higher coordination; single and double groups (n=1,2)

(58.1.1)Dana Group

58.1.1.1 Kornerupine (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

58.1.1.2 Prismatine! ([],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 C mcm 2/m 2/m 2/m

Strunz Class:

VIII/B.31-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.31 - Kornerupine - Harkerite series

VIII/B.31-10 Kornerupine (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

VIII/B.31-12 Prismatine! ([],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 C mcm 2/m 2/m 2/m

VIII/B.31-15 Magnesiodumortierite (Mg,Ti,[])<1(Al,Mg)2Al4Si3O18-y(OH)yBy=2-3 Pmcn 2/m 2/m 2/m

VIII/B.31-20 Dumortierite Al6.5-7(BO3)(SiO4)3(O,OH)3 Pcmn 2/m 2/m 2/m

VIII/B.31-30 Holtite Al6(Al,Ta)(BO3)[(SiO4,SbO4,AsO4)]3(O,OH)3 P nma 2/m 2/m 2/m

VIII/B.31-40 Grandidierite (Mg,Fe)Al3(BO4)(SiO4)O Pbnm 2/m 2/m 2/m

VIII/B.31-42 Ominelite! (Fe,Mg)Al3BSiO9 Pbnm 2/m 2/m 2/m

VIII/B.31-45 Boralsilite! Al16B6Si2O27 C 2/m 2/m

VIII/B.31-50 Werdingite (Mg,Fe)2Al14B4Si4O37 P1 1

VIII/B.31-60 Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10·2(H2O) R 3m 3 2/m

Other Kornerupine Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Kornerupine

(Mg,Fe++)4(Al,Fe+++)6(SiO4,BO4)5(O,OH)2
Dana No: 58.1.1.1 Strunz No: VIII/B.31-10
Locality:

Notes: