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Alfredopetrovite

This page kindly sponsored by Mark Kucera
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About AlfredopetroviteHide

Alfredo Petrov
Formula:
Al2(Se4+O3)3·6H2O
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.504 (Calculated)
Crystal System:
Hexagonal
Name:
to honor Alfredo Petrov, geologist, mineral dealer, translator, operator of mineralogical travels (incl. Bolivia, Japan, and others), author of many publications on minerals
New structure type. Unique combination of elements; the first aluminium selenate (selenite) mineral.

Structural details/elements:
- quite regular AlO6 octahedra
- SeO3 triangular pyramids
- [Al(H2O)3]2(SeO3)3 cluster formed by the connection of three selenate groups and two adjacent AlO6 octahedra
- hydrogen bonds, standing for the only linkage of the clusters
- relatively large channels running along [001].
The configuration of the above cluster resembles that of the distinctive unit in the NASICON-type structure, known as a lantern unit.


Classification of AlfredopetroviteHide

Approved
Approval Year:
2015
First Published:
2015
7.CA.X

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
A : With small cations

Pronounciation of AlfredopetroviteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of AlfredopetroviteHide

Vitreous
Hardness:
2½ on Mohs scale
Cleavage:
None Observed
Comment:
Curved fracture
Density:
2.504 g/cm3 (Calculated)

Optical Data of AlfredopetroviteHide

Type:
Uniaxial (+)
RI values:
nω = 1.554() nε = 1.566(2)
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of AlfredopetroviteHide

Formula:
Al2(Se4+O3)3·6H2O
IMA Formula:
Al2(Se4+O3)3 · 6H2O

Crystallography of AlfredopetroviteHide

Crystal System:
Hexagonal
Class (H-M):
6 m2 - Ditrigonal Dipyramidal
Space Group:
P62c
Setting:
P62c
Cell Parameters:
a = 8.818(3) Å, c = 10.721(2) Å
Ratio:
a:c = 1 : 1.216
Unit Cell V:
722 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.63(55)
6.22(55)
5.37(26)
4.398(40)
3.404(100)
2.783(50)
2.606(22)
1.661(26)

Type Occurrence of AlfredopetroviteHide

General Appearance of Type Material:
drusy/scaly coatings and compact balls, the latter to 0.5 mm in diameter. Individual crystals are up to about 0.1 mm across.
Place of Conservation of Type Material:
Co-type material is deposited in the collections of the Natural History Museum of Los Angeles County, Los Angeles, USA, catalogue numbers 64111, 65578, 65579 and 65580, and the Museum Victoria, Australia, registration number M53004
Geological Setting of Type Material:
secondary phase in vugs within a selenide-dolomite-goethite matrix
Associated Minerals at Type Locality:

Synonyms of AlfredopetroviteHide

Other Language Names for AlfredopetroviteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Krut'aite1 photo of Alfredopetrovite associated with Krut'aite on mindat.org.
Felsőbányaite1 photo of Alfredopetrovite associated with Felsőbányaite on mindat.org.

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 AlfredopetroviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Mills, S.J., Nash, B.P., Thorne, B. and Favreau, G. (2015) Alfredopetrovite, IMA 2015-026. CNMNC Newsletter No. 26, August 2015, page 943; Mineralogical Magazine, 79, 941-947.
Kampf, A.R., Mills, S.J., Nash, B.P., Thorne, B., Favreau, G. (2016): Alfredopetrovite, a new selenite mineral from the El Dragón mine, Bolivia. European Journal of Mineralogy, 28, 479-484.

Internet Links for AlfredopetroviteHide

Localities for AlfredopetroviteHide

ⓘ - 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.
Bolivia (TL)
 
  • Potosí
    • Antonio Quijarro Province
Kampf, A.R., Mills, S.J., Nash, B.P., Thorne, B. and Favreau, G. (2015) Alfredopetrovite, IMA 2015-026. CNMNC Newsletter No. 26, August 2015, page 943; Mineralogical Magazine, 79, 941-947.
Mineral and/or Locality  
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