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Alarsite

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Big Photo

Northern Breakthrough (North Breach), Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
© 2008, JGW




Formula:
AlAsO
 
4
System:TrigonalColour:Colorless, with pale ...
Lustre:VitreousHardness:5 - 5½
Name:Named by Tatyana Fedorovna Semenova, Lidiya Pavlovna Vergasova, Stanislav Konstantinovich Filatov, and Vasiliy Viktorovich Ananev in 1994 from its composition, containing ALuminium and ARSenic.
This page provides mineralogical data about Alarsite.

Classification of Alarsite

IMA status:Approved 1993
Strunz 8th edition ID:7/A.01-12
Nickel-Strunz 10th (pending) edition ID:8.AA.05

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
A : With small cations (some also with larger ones)
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Type Occurrence of Alarsite

Type Locality:Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia
Place of Conservation of Type Material:Mining Institute, St. Petersburg, Russia.
Geological Setting of type material:Fumarolic exhalations
Associated Minerals at type locality:
TenoriteNabokoiteLangbeiniteLammeriteKlyuchevskite
HematiteFedotoviteAtlasovite

Physical Properties of Alarsite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colorless, with pale tints of yellow, green, blue due to inclusions
Comment:colorless in transmitted light
Streak:White
Hardness (Mohs):5 - 5½
Tenacity:Brittle
Cleavage:None Observed
Density (calculated):3.32 g/cm3

Crystallography of Alarsite

Crystal System:Trigonal
Class (H-M):3 2 - Trapezohedral
Space Group:P31 2 1
Morphology:Subhedral grains, to 0.3 mm, in aggregates.
Comment:Possibly P3221
X-Ray Powder Diffraction:
d-spacingIntensity
4.36 (20)
4.06 (31)
3.442 (100)
2.514 (80)
2.359 (15)
1.873 (16)
1.4202 (11)

Optical Data of Alarsite

Type:Uniaxial (+)
RI values: nω = 1.596 nε = 1.608
Birefringence:0.012
Maximum Birefringence:δ = 0.012

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Optical Extinction:Parallel.
Pleochroism:Non-pleochroic

Chemical Properties of Alarsite

Formula:
AlAsO
 
4
Essential elements:Al, As, O
All elements listed in formula:Al, As, O

Relationship of Alarsite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AA.05Berlinite
AlPO
 
4
8.AA.05Rodolicoite
Fe
3+
 
PO
 
4
8.AA.10Beryllonite
NaBePO
 
4
8.AA.15Hurlbutite
CaBe
 
2
(PO
 
4
)
 
2
8.AA.20Lithiophosphate
Li
 
3
PO
 
4
8.AA.25Nalipoite
NaLi
 
2
PO
 
4
8.AA.30Olympite
Na
 
5
Li(PO
 
4
)
 
2

Other Names for Alarsite

Synonyms:
IMA1993-003
Other Languages:
German:Alarsit
Russian:Аларсит
Spanish:Alarsita

Other Information

Fluorescence in UV light:Not fluorescent
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Alarsite

Reference List:

- +
Tatyana Fedorovna Semenova, Lidiya Pavlovna Vergasova, Stanislav Konstantinovich Filatov, and Vasiliy Viktorovich Ananev, 1994, Alarsite AlAsO4: a New Mineral from Volcanic Exhalations, Doklady Akademii Nauk: 338(4): 501-505.

Internet Links for Alarsite

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  • Raman and XRD data at RRUFF project
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    • Localities for Alarsite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Far-Eastern Region
      • Kamchatka Oblast'
        • Tolbachik volcano
    		[DAN,(1994) 338, n4, 501-505; MinRec 27:201]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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