Kornerupine Mineral Data

General Kornerupine Information

Chemical Formula:

(Mg,Fe++)4Al6(SiO4,BO4)5(O,OH)2

Composition:

Molecular Weight = 734.04 gm

Sodium 0.03 % Na 0.04 % Na₂O

Lithium 0.04 % Li 0.08 % Li₂O

Calcium 0.05 % Ca 0.08 % CaO

Magnesium 11.52 % Mg 19.11 % MgO

Titanium 0.07 % Ti 0.11 % TiO₂

Aluminum 24.48 % Al 46.26 % Al₂O₃

Iron 1.22 % Fe 1.57 % FeO

Silicon 14.04 % Si 30.04 % SiO₂

Boron 0.46 % B 1.47 % B₂O₃

Hydrogen 0.14 % H 1.21 % H₂O

Oxygen 47.93 % O

Fluorine 0.03 % F 0.03 % F

- % F -0.01 % -O=F₂

______ ______

100.00 % 99.98 % = TOTAL OXIDE

Empirical Formula:

Mg_3.48Fe²⁺_0.16Li_0.04Ca_0.01Na_0.01Al_5.64Ti_0.01Si_3.67Al_1.02B_0.31O₂₁(OH)_0.99F_0.01

Environment:

In boron-rich volcanic and sedimentary rocks subjected to amphibolite to granulite facies metamorphism; in metamorphosed anorthosite complexes

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

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

Name Origin:

Named after the Danish geologist, Andreas Nikolaus Kornerup (1857-1881).

Name Pronunciation:

Kornerupine + Pronunciation

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)= 3.29

Crystal System:

Orthorhombic - Dipyramidal H-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): 2.639(1), 3.03(0.8), 2.118(0.6),3.37(0.6), 1.503(0.4), 1.685(0.3), 2.096(0.3),

Physical Properties of Kornerupine

Cleavage:

{110} Indistinct

Color:

Brown, Colorless, Green, Greenish yellow, Yellow.

Density:

3.3 - 3.34, Average = 3.32

Diaphaneity:

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= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2049,KPDmeas= 0.2031,KC= 0.2076
Ncalc = 1.68 - 1.69

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.

Calculated Properties of Kornerupine

Electron Density:

Bulk Density (Electron Density)=3.25 gm/cc
note: Specific Gravity of Kornerupine =3.29 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Kornerupine= 1.89 barns/electron
U=PE_Kornerupine x rElectron Density= 6.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kornerupine is Not Radioactive

Kornerupine Classification

Dana Class:

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

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

(58.01.01)Kornerupine Group

58.01.01.01 Kornerupine (Mg,Fe)4Al6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

58.01.01.02 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:

09.BJ.50 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BJ -Sorosilicates with Si3O10, Si4O11, etc

09.BJ.50 Kornerupine (Mg,Fe)4Al6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

09.BJ.50 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

Other Kornerupine Information

See Also:

Links to other databases for Kornerupine :
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 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - Tradeshop.com - The Rainbow of Gems
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Kornerupine Specimen Label here :

Kornerupine

(Mg,Fe++)4Al6(SiO4,BO4)5(O,OH)2
Dana No: 58.01.01.01 Strunz No: 09.BJ.50
Locality:

Notes:

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