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Tredouxite

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About TredouxiteHide

Marian Tredoux
Formula:
NiSb2O6
Colour:
Light gray
Lustre:
Sub-Metallic
Hardness:
3
Crystal System:
Tetragonal
Name:
Named in honor of Marian Tredoux (b. 20 September 1952), professor in the Department of Geology, University of the Free State, Bloemfontein, South Africa because of her work on the type locality - the Bon Accord nickel oxide deposit in the Barberton greenstone belt.
Isostructural with:
The Ni analogue of byströmite.
As subhedral to anhedral grains intergrown with bottinoite.


Classification of TredouxiteHide

Approved
Approval Year:
2017
First Published:
2017

Physical Properties of TredouxiteHide

Sub-Metallic
Colour:
Light gray
Comment:
In polished sections
Streak:
Gray
Hardness:
Hardness:
VHN10=218 - 240 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed

Optical Data of TredouxiteHide

Type:
Anisotropic
Anisotropism:
Very weak
Bireflectance:
Weak
Reflectivity:
471.1nmR1=15.6%R2= 15.8%
548.3nmR1=14.6%R2= 14.4%
586.6nmR1=14.5%R2= 14.3%
652.3nmR1=14.6%R2= 14.4%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 15.8%.
R1 shown in black, R2 shown in red
Internal Reflections:
Weak red-brown
Pleochroism:
Non-pleochroic

Chemical Properties of TredouxiteHide

Formula:
NiSb2O6

Crystallography of TredouxiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P42/mnm
Setting:
P42/mnm
Cell Parameters:
a = 4.6324(5) Å, c = 9.2154(8) Å
Ratio:
a:c = 1 : 1.989
Unit Cell V:
197.91 ų
Z:
2
Morphology:
Subhedral to anhedral grains

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.14(10)
3.28(100)
2.561(65)
2.316(20)
1.716(60)
1.639(10)
1.467(10)
1.379(20)

Relationship of Tredouxite to other SpeciesHide

Other Members of this group:
ByströmiteMgSb2O6Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
OrdoñeziteZnSb2O6Tet.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TredouxiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bindi, L., Zaccarini, F., Miller, D.E., Garuti, G. (2017) Tredouxite, IMA 2017-061. CNMNC Newsletter No. 39, October 2017, page 1284; Mineralogical Magazine: 81: 1279–1286.
Bindi, L., Zaccarini, F., Miller, D.E., Garuti, G. (2017) Tredouxite, NiSb2O6: another new Ni-bearing mineral from Bon Accord oxide body, South Africa. European Journal of Mineralogy, Preprint. https://doi.org/10.1127/ejm/2018/0030-2714

Internet Links for TredouxiteHide

Localities for TredouxiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
South Africa
 
  • Mpumalanga Province
    • Ehlanzeni District
      • Barberton
        • Bon Accord
Bindi, L., Zaccarini, F., Miller, D.E., Garuti, G. (2017): Tredouxite, IMA 2017-061. CNMNC Newsletter No. 39, October 2017, page 1284; Mineralogical Magazine, 81, 1279–1286; http://forum.amiminerals.it/viewtopic.phpf=5&t=14029&sid=1bd8fea6f10174ac7bdd04a79c06bffd (2017)
Mineral and/or Locality  
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