Arangasite
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About Arangasite
Formula:
Al2F(PO4)(SO4) · 9H2O
Colour:
Colorless
Lustre:
Silky, Dull
Hardness:
1 - 2
Specific Gravity:
2.01
Crystal System:
Monoclinic
Name:
Named after the place of finding — the Arangas River.
Classification of Arangasite
Approved
Approval Year:
2012
Physical Properties of Arangasite
Silky, Dull
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
1 - 2 on Mohs scale
Cleavage:
Imperfect/Fair
Basal
Basal
Parting:
Not observed
Density:
2.01(1) g/cm3 (Measured) 2.001 g/cm3 (Calculated)
Optical Data of Arangasite
Type:
Biaxial (+)
RI values:
nα = 1.493(5) nγ = 1.485(5)
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Max Birefringence:
δ = 0.008
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:
Moderate
Pleochroism:
Non-pleochroic
Chemical Properties of Arangasite
Formula:
Al2F(PO4)(SO4) · 9H2O
IMA Formula:
Al2(SO4)(PO4)F · 9H2O
Crystallography of Arangasite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 7.073(1) Å, b = 9.634(2) Å, c = 10.827(2) Å
β = 100.40(1)°
β = 100.40(1)°
Ratio:
a:b:c = 0.734 : 1 : 1.124
Unit Cell V:
725.7 ų
Z:
2
Morphology:
Compact white segregations composed of thin-lamella aggregates.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.57 | (36) |
| 9.60 | (100) |
| 7.123 | (23) |
| 5.295 | (34) |
| 4.695 | (17) |
| 4.191 | (29) |
| 3.218 | (50) |
| 2.870 | (20) |
Type Occurrence of Arangasite
Place of Conservation of Type Material:
The Fersman Museum of the Russian Academy of Science, Moscow, Russia, catalogue number 4254/1
Geological Setting of Type Material:
Cassiterite-silicate-sulfide ores of Alaskitovoye deposit (in Eastern Yakutia). It belongs to secondary minerals of the oxidation zone and occurs in cavities inside quartz-muscovite-tourmaline-sulfide veins and surrounding greisens.
Associated Minerals at Type Locality:
Synonyms of Arangasite
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.
References for Arangasite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Gamyanin, G.N., Zayakina, N.V. and Galenchikova, L.T. (2012): Arangasite, IMA 2012-018. CNMNC Newsletter No. 14, October 2012, page 1282; Mineralogical Magazine, 76, 1281-1288.
Gamyanin, G.N., Zayakina, N.V., Galenchikova, L.T. (2013): Arangasite, Al2(PO4)(SO4)F·7.5Н2O, a new mineral from Alaskitovoye deposit (Eastern Yakutia, Russia). Zapiski RMO, 142(5), 21-30.
Yakubovich, O.V., Steele, I.M., Chernyshev, V.V., Zayakina, N.V., Gamyanin, G.N., Karimova, O.V. (2014): The crystal structure of arangasite, Al2F(PO4)(SO4)•9H2O determined using low-temperature synchrotron data. Mineralogical Magazine, 78, 889-903.
Internet Links for Arangasite
mindat.org URL:
https://www.mindat.org/min-43332.html
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Please feel free to link to this page.
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Localities for Arangasite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - 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).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Gamyanin, G.N., Zayakina, N.V. and Galenchikova, L.T. (2012): Arangasite, IMA 2012-018. CNMNC Newsletter No. 14, October 2012, page 1282; Gamyanin, G.N., Zayakina, N.V., Galenchikova, L.T. (2013): Arangasite, Al2(PO4)(SO4)F·7.5Н2O, a new mineral from Alaskitovoye deposit (Eastern Yakutia, Russia)". Zapiski RMO, 142(5), 21-30. |
Alyaskitovoye Sn-W deposit, Ust'-Nera, Indigirka River Basin, Sakha Republic, Eastern-Siberian Region, Russia