Tegengrenite Mineral Data

General Tegengrenite Information

Chemical Formula:

(Mg,Mn++)2Sb+++++0.5(Mn+++,Si,Ti)0.5O4

Composition:

Molecular Weight = 219.12 gm

Magnesium 13.31 % Mg 22.07 % MgO

Titanium 0.87 % Ti 1.46 % TiO₂

Manganese 25.07 % Mn 25.90 % MnO / 7.21 % Mn₂O₃

Zinc 2.98 % Zn 3.71 % ZnO

Silicon 0.77 % Si 1.65 % SiO₂

Antimony 27.78 % Sb 36.91 % Sb₂O₅

Oxygen 29.21 % O

______ ______

100.00 % 98.90 % = TOTAL OXIDE

Empirical Formula:

Mg_1.2Mn²⁺_0.8Zn_0.1Sb_0.5Mn³⁺_0.2Si_0.06Ti_0.04O₄

Environment:

In a manganese-iron deposit in marble. Related to the spinal group

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Jokobsberg Fe-Mn deposit, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Felix Tegengren (1884-1980), a renowned Finlandic-Swedish economic geologist who wrote about the ore deposits of Sweden and China.

Synonym:

IMA1999-002

Tegengrenite Image

Images:

Tegengrenite

Comments: Red, pseudo-octahedral crystal of tegengrenite in quartz.
Location: Jakobsberg, Nordmark, Filipstad, VÃ¤rmland, Sweden. Scale: Picture size 0.8 mm.
© Thomas Witzke / Abraxas-Verlag

Tegengrenite Crystallography

Axial Ratios:

a:c = 1:0.92294

Cell Dimensions:

a = 16.196, c = 14.948, Z = 42; V = 3,395.70 Den(Calc)= 4.50

Crystal System:

Trigonal Space Group: R 3 or R 3-

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

By Intensity(I/I_o): 2.608(1)(241,143,125), 3.052(0.33)(140,214), 1.6652(0.3)(363,075),1.5273(0.29)(428), 2.162(0.28)(244), 1.5313(0.26)(820), 4.98(0.2)(211,003),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 2 0 1) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.

Physical Properties of Tegengrenite

Cleavage:

None

Color:

Dark red.

Diaphaneity:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.

Luster:

Subadamantine

Optical Properties of Tegengrenite

Optical Data:

NCalc= 1.85 - from Gladstone-Dale relationship (KC = 0.1884) where Ncalc=Dcalc*KC+1

Calculated Properties of Tegengrenite

Electron Density:

Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Tegengrenite =4.50 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Tegengrenite= 96.81 barns/electron
U=PE_Tegengrenite x rElectron Density= 404.06 barns/cc.

Radioactivity:

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

Tegengrenite Classification

Dana Class:

07.02.13.02 (07)Multiple Oxides

(07.02)(A+ B++)2 X4 Spinel group

(07.02.13)Dana Group

07.02.13.01 Filipstadite (Mn,Mg)4SbFeO8 pseudo ISO 2/m 2/m 2/m

07.02.13.02 Tegengrenite! (Mg,Mn)2Sb0.5(Mn,Si,Ti)0.5O4 R 3 or R 3- Trig

Strunz Class:

04.BB.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.B - Metal:Oxygen = 3:4 and similar

04.BB -With only medium-sized cations

04.BB.20 Tegengrenite! (Mg,Mn)2Sb0.5(Mn,Si,Ti)0.5O4 R 3 or R 3- Trig

Other Tegengrenite Information

References:

NAME( MinRec, Vol 32, p 419) PHYS. PROP.(MinRec, Vol 32, p 419)

See Also:

Links to other databases for Tegengrenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Tegengrenite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tegengrenite :

Ask about Tegengrenite 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 Tegengrenite Specimen Label here :

Tegengrenite

(Mg,Mn++)2Sb+++++0.5(Mn+++,Si,Ti)0.5O4
Dana No: 07.02.13.02 Strunz No: 04.BB.20
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.