Oboyerite
A mixture of two or more distinct mineral species
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About Oboyerite
Oliver M. Boyer
Colour:
Milk white
Hardness:
1½
Specific Gravity:
6.4
Crystal System:
Triclinic
Name:
Named in 1979 by S.A. Williams in honor of Oliver Michael Boyer (15 November 1842, New Hope, Ohio, USA - 14 September 1918, Medford, Oklahoma, USA), prospector. In 1878 he discovered several rich veins of silver in mines near Tombstone. After killing a man, he was sentenced to death but in 1883 he was released on the condition that he leave Arizona. He then took up a life of farming.
First Recorded Locality:
A Mixture Of:
First described as a new mineral in 1979 and discredited by CNMNC-IMA in 2019.
Type material consists of at least two distinct phases: ottoite and plumbotellurite.
Type material consists of at least two distinct phases: ottoite and plumbotellurite.
Unique Identifiers
Mindat ID:
3055
Long-form identifier:
mindat:1:1:3055:3
IMA Classification of Oboyerite
Approval year:
1979
First published:
1979
Approval history:
1979: Approved as IMA 1979-009
2019: Discredited by CNMNC-IMA (proposal 19-D).
2019: Discredited by CNMNC-IMA (proposal 19-D).
Classification of Oboyerite
4..
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
:
:
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
:
:
34.8.3.1
34 : SELENITES, TELLURITES AND SULFITES
8 : Compound Selenites, Tellurites and Sulfites
34 : SELENITES, TELLURITES AND SULFITES
8 : Compound Selenites, Tellurites and Sulfites
28.4.5
28 : Selenites, Selenates, Tellurites, and Tellurates
4 : Tellurates
28 : Selenites, Selenates, Tellurites, and Tellurates
4 : Tellurates
Physical Properties of Oboyerite
Transparency:
Translucent
Colour:
Milk white
Hardness:
1½ on Mohs scale
Density:
6.4(6) g/cm3 (Measured) 6.66 g/cm3 (Calculated)
Optical Data of Oboyerite
Type:
Biaxial
RI values:
nα = 2.24 nγ = 2.26
Max. Birefringence:
δ = 0.020
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Dispersion:
relatively strong
Optical Extinction:
Maximum at 37 degrees to elongation.
Crystallography of Oboyerite
Crystal System:
Triclinic
Cell Parameters:
a = 12.249(8) Å, b = 15.113(6) Å, c = 6.868(3) Å
α = 116.45(4)°, β = 98.58(4)°, γ = 85.82(4)°
α = 116.45(4)°, β = 98.58(4)°, γ = 85.82(4)°
Ratio:
a:b:c = 0.81 : 1 : 0.454
Unit Cell V:
1,125.54 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tiny spherules
First Recorded Occurrence of Oboyerite
Place of Conservation of First Recorded Material:
Smithsonian Museum, Washington DC 162210
Geological Setting of First Recorded Material:
Mine dump.
Synonyms of Oboyerite
Other Language Names for Oboyerite
Common Associates
Associations Based on Photo Data:
| 1 photo of Oboyerite associated with Jarosite | KFe3+3(SO4)2(OH)6 |
| 1 photo of Oboyerite associated with Chlorargyrite | AgCl |
Related Minerals - Strunz-mindat Grouping
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Oboyerite
mindat.org URL:
https://www.mindat.org/min-3055.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Oboyerite
Reference List:
Williams, S. A. (1979) Girdite, oboyerite, fairbankite, and winstanleyite, four new tellurium minerals from Tombstone, Arizona. Mineralogical Magazine, 43 (328) 453-457 doi:10.1180/minmag.1979.043.328.01
Fleischer, Michael, Cabri, Louis J., Chao, G. Y., Pabst, Adolf (1980) New Mineral Names. American Mineralogist, 65 (7-8) 808-814
Localities for Oboyerite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
USA (FRL) | |
| Williams (1979) +2 other references |
| Missen et al. (2019) +1 other reference | |
| Anthony et al. (1995) +1 other reference | |
| Luetcke (n.d.) +2 other references |
Grand Central Mine, Contention-Grand Central Mine group, Tombstone Mining District, Cochise County, Arizona, USA