Kornerupine Mineral Data

Kornerupine Mineral Data +

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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)

Search for Kornerupine using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Kornerupine :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Kornerupine Mineral Data :

Ask about Kornerupine here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

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: