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Arangasite

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About ArangasiteHide

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.
Chemically related to sanjuanite and mitryaevaite.
Structurally related to destinezite.



Classification of ArangasiteHide

Approved
Approval Year:
2012

Physical Properties of ArangasiteHide

Silky, Dull
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
1 - 2 on Mohs scale
Cleavage:
Imperfect/Fair
Basal
Parting:
Not observed
Density:
2.01(1) g/cm3 (Measured)    2.001 g/cm3 (Calculated)

Optical Data of ArangasiteHide

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.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of ArangasiteHide

Formula:
Al2F(PO4)(SO4) · 9H2O
IMA Formula:
Al2(SO4)(PO4)F · 9H2O

Crystallography of ArangasiteHide

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)°
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 ArangasiteHide

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 ArangasiteHide

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 ArangasiteHide

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 ArangasiteHide

Localities for ArangasiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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). 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.
Russia (TL)
 
  • Eastern-Siberian Region
    • Sakha Republic (Yakutia)
      • Indigirka River Basin
        • Ust'-Nera
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.
Mineral and/or Locality  
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