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Backite

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About BackiteHide

Malcolm E. Back
Formula:
Pb2AlTeO6Cl
Colour:
Dark to pale blue-grey
Lustre:
Adamantine
Hardness:
2 - 3
Specific Gravity:
5.573 (Calculated)
Crystal System:
Trigonal
Name:
Named by K.T. Tait, V. DiCecco, M.A. Cooper, N.A. Ball, and F.C. Hawthorne in 2014 in honor of Malcolm E. Back (1951 - ), X-ray technician at the Royal Ontario Museum in Toronto, Canada, and author of the 2015 edition of "Fleischer's Glossary of Mineral Species."
New structure type.


Classification of BackiteHide

Approved
Approval Year:
2013
First Published:
2014

Physical Properties of BackiteHide

Adamantine
Transparency:
Transparent
Colour:
Dark to pale blue-grey
Streak:
Very pale bluish-grey
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Micaceous cleavage parallel to {001}.
Fracture:
Splintery
Density:
5.573 g/cm3 (Calculated)

Chemical Properties of BackiteHide

Formula:
Pb2AlTeO6Cl

Crystallography of BackiteHide

Crystal System:
Trigonal
Class (H-M):
3 2 - Trapezohedral
Space Group:
P3 1 2
Setting:
P3 1 2
Cell Parameters:
a = 5.0441(7) Å, c = 9.421(2) Å
Ratio:
a:c = 1 : 1.868
Unit Cell V:
205.58 ų
Z:
1
Morphology:
Rosettes of hexagonal plates.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.363(55)
3.959(11)
3.193(100)
2.521(55)
2.187(17)
1.978(28)
1.715(20)
1.555(35)
Comments:
From Type Description.

Type Occurrence of BackiteHide

General Appearance of Type Material:
As rosettes of hexagonal plates perched on microcrystalline quartz
Place of Conservation of Type Material:
Type material is deposited in the collections of the Department of Natural History, Royal Ontario Museum, 100 Queens Park, Toronto, Ontario M5S 2C6, Canada, catalogue number M56436
Associated Minerals at Type Locality:

Synonyms of BackiteHide

Fluorescence of BackiteHide

Does not fluoresce under ultraviolet light.

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 BackiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Tait, K.T., DiCecco, V., Cooper, M.A., Ball, N.A., Hawthorne. F.C. (2014) Backite, IMA 2013-113. CNMNC Newsletter No. 19, February 2014, page 169. Mineralogical Magazine: 78: 165-170.
Tait, K.T., DiCecco, V., Ball, N.A., Hawthorne, F.C., Kampf, A.R. (2014) Backite, Pb2Al(TeO6)Cl, a new tellurate mineral from the Grand Central Mine, Tombstone Hills, Cochise County, Arizona: Description and crystal structure. Canadian Mineralogist: 52: 935-942.
Belakovskiy, D.I., Cámara, F., Gagne, O.C., Uvarova, Y. (2016) New mineral names. American Mineralogist: 101: 1489-1497.

Internet Links for BackiteHide

Localities for BackiteHide

ⓘ - 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.
USA (TL)
 
  • Arizona
    • Cochise Co.
      • Tombstone Hills
        • Tombstone District
          • Contention-Grand Central Mine group
Tait, K.T., DiCecco, V., Cooper, M.A., Ball, N.A. and Hawthorne. F.C. (2014) Backite, IMA 2013-113. CNMNC Newsletter No. 19, February 2014, page 169; Mineralogical Magazine, 78, 165-170.; Tait, K.T., DiCecco, V., Ball, N.A., Hawthorne, F.C., Kampf, A.R. (2014): Backite, Pb2Al(TeO6)Cl, a new tellurate mineral from the Grand Central Mine, Tombstone Hills, Cochise County, Arizona: Description and crystal structure. Canadian Mineralogist, 52, 935-942
Mineral and/or Locality  
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