Alfredopetrovite
A valid IMA mineral species
This page kindly sponsored by Mark Kucera
About Alfredopetrovite
Alfredo Petrov
Formula:
Al2(Se4+O3)3 · 6H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2½
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 selenite mineral.
Compare llantenesite and petermegawite.
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.
Compare llantenesite and petermegawite.
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.
Unique Identifiers
Mindat ID:
46683
Long-form identifier:
mindat:1:1:46683:1
GUID
(UUID V4):
(UUID V4):
021336ba-514c-4143-95e0-8909de47859c
IMA Classification of Alfredopetrovite
Approved
Approval year:
2015
First published:
2016
Classification of Alfredopetrovite
7.CA.X
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
A : With small cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
A : With small cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Afd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Alfredopetrovite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Alfredopetrovite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2½ on Mohs scale
Comment:
Based on scratch tests
Tenacity:
Brittle
Cleavage:
None Observed
Comment:
Curved fracture
Density:
2.504 g/cm3 (Calculated)
Comment:
Could not be measured
Optical Data of Alfredopetrovite
Type:
Uniaxial (+)
RI values:
nω = 1.554(2) 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.
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Chemistry of Alfredopetrovite
Mindat Formula:
Al2(Se4+O3)3 · 6H2O
Elements listed:
Crystallography of Alfredopetrovite
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
Morphology:
No forms could be determined in type material because the crystals occur in intergrowths.
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.63 Å | (55) |
| 6.22 Å | (55) |
| 5.37 Å | (26) |
| 4.398 Å | (40) |
| 3.404 Å | (100) |
| 2.783 Å | (50) |
| 2.606 Å | (22) |
| 1.661 Å | (26) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Alfredopetrovite
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:
Reference:
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.
Synonyms of Alfredopetrovite
Other Language Names for Alfredopetrovite
Common Associates
Associated Minerals Based on Photo Data:
| 12 photos of Alfredopetrovite associated with Chalcomenite | CuSeO3 · 2H2O |
| 6 photos of Alfredopetrovite associated with Ahlfeldite | Ni(SeO3) · 2H2O |
| 3 photos of Alfredopetrovite associated with Krut'aite | CuSe2 |
| 3 photos of Alfredopetrovite associated with Felsőbányaite | Al4(SO4)(OH)10 · 4H2O |
| 2 photos of Alfredopetrovite associated with Goethite | α-Fe3+O(OH) |
| 1 photo of Alfredopetrovite associated with Penroseite | (Ni,Co,Cu)Se2 |
| 1 photo of Alfredopetrovite associated with Clinochalcomenite | CuSeO3 · 2H2O |
| 1 photo of Alfredopetrovite associated with Umangite | Cu3Se2 |
| 1 photo of Alfredopetrovite associated with Olsacherite | Pb2(Se6+O4)(SO4) |
Related Minerals - Strunz-mindat Grouping
| 7.CA. | Pilipenkoite | KCu(AsO4) · H2O |
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 Alfredopetrovite
mindat.org URL:
https://www.mindat.org/min-46683.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Alfredopetrovite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter 26. Mineralogical Magazine, 79 (4) 941-947 doi:10.1180/minmag.2015.079.4.05
Localities for Alfredopetrovite
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.
Bolivia (TL) | |
| Mineralogical Magazine +3 other references |
Quick NavTopAbout AlfredopetroviteUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
El Dragón mine, Porco Municipality, Antonio Quijarro Province, Potosí, Bolivia