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Arapovite

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Big Photo

Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan
© 2008, JGW

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Formula:
(K,◻)(Ca,Na)
 
2
(U,Th)[Si
 
8
O
 
20
] · H
 
2
O
System:TetragonalColour:Dark-green
Hardness:5½ - 6
Member of:Steacyite Group
Name:Named after YU. A. Arapov, Russian geologist and petrographer, who worked in the Turkestan-Alay Range.


Steacyite Group. The uranium analogue of Turkestanite.

Classification of Arapovite

IMA status:Approved 2003
Strunz 8th edition ID:8/E.10-50
Nickel-Strunz 10th (pending) edition ID:9.CH.10

9 : SILICATES (Germanates)
C : Cyclosilicates
H : [Si4O12]8- 4-membered double rings
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Type Occurrence of Arapovite

Type Locality:Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan

Physical Properties of Arapovite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Comment:Pitchy
Colour:Dark-green
Hardness (Mohs):5½ - 6
Hardness (Vickers):VHN100=682 - 766 kg/mm2
Cleavage:None Observed
Fracture:Conchoidal
Density (measured):3.43(2) g/cm3

Crystallography of Arapovite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:P4/mcc {P4/m 2/c 2/c}
Cell Parameters:a = 7.5505(4) Å, c = 14.7104(4) Å
Ratio:a:c = 1 : 1.948
Unit Cell Volume:V 838.64 ų (Calculated from Unit Cell)
Z:2
Comment:Made on partially annealed crystal.
X-Ray Powder Diffraction:
d-spacingIntensity
5.34(23)
5.28(38)
3.37(100)
3.31(59)
2.640(64)
2.515(21)
2.161(45)
2.016(29)
1.644(30)
Comments:From type description.

Optical Data of Arapovite

Type:Uniaxial (-)
RI values: nω = 1.615() nε = 1.610(2)
Maximum Birefringence:δ = 0.005

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Arapovite

Formula:
(K,◻)(Ca,Na)
 
2
(U,Th)[Si
 
8
O
 
20
] · H
 
2
O
Essential elements:Ca, H, K, O, Si, U
All elements listed in formula:Ca, H, K, Na, O, Si, Th, U

Relationship of Arapovite to other Species

Member of:Steacyite Group
Other Members of Group:

- +
Iraqite-(La)
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
Steacyite
(◻,K)(Na,Ca)
 
2
(Th,U)[Si
 
8
O
 
20
]
Turkestanite
(K,◻)(Ca,Na)
 
2
(Th,U)[Si
 
8
O
 
20
] · nH
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
9.CH.05Hyalotekite
(Ba,Pb,Ca,K)
 
6
(B,Si,Al)
 
2
(Si,Be)
 
10
O
 
28
(F,Cl)
9.CH.05Kapitsaite-(Y)
(Ba,K,Pb)
 
4
(Y,Ca)
 
2
Si
 
8
(B,Si)
 
4
O
 
28
F
9.CH.10Iraqite-(La)
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
9.CH.10Steacyite
(◻,K)(Na,Ca)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.CH.10Turkestanite
(K,◻)(Ca,Na)
 
2
(Th,U)[Si
 
8
O
 
20
] · nH
 
2
O

Other Names for Arapovite

Synonyms:
IMA2003-046
Other Languages:
German:Arapovit
Russian:Араповит

Other Information

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 Arapovite

Reference List:

- +
Agakhanov, A.A., Pautov, L.A., Uvarova, Y.A., Sokolova, E.V., Hawthorne, F.C., Karpenko, V.Y., Dusmatov, V.D., and Semenov, E.I. (2004) Arapovite, (U,Th)(Ca,Na)2(K1-x∅ x)Si8O20·H2O – new mineral, New Data on Minerals. Moscow, 39, 14-20.

Uvarova, Yu. A., E. Sokolova, F. C. Hawthorne, A. A. Agakhanov, and L. A. Pautov (2004) "The crystal structure of arapovite, U4+ (Ca,Na)2 (K1–x∅x) [Si8O20], x ≈ 0.5, a new mineral species of the steacyite group from the Dara-i-Pioz moraine, Tien-Shan Mountains, Tajikistan", Canadian Mineralogist 42: 1005-1011.

Locock, A.J., Piilonen, P.C., Ercit, T.S., and Rowe, R. (2006) New mineral names, American Mineralogist, 91, 216-224.

Pekov, I.V. (2007) New minerals from former Soviet Union countries, 1998-2006: new minerals approved by the IMA commission on new minerals and mineral names, Mineralogical Almanac, 11, 9-51.

Internet Links for Arapovite

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    • Localities for Arapovite

    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.
    Tajikistan
     
    • Region of Republican Subordination
      • Tien Shan Mts
        • Alai (Alayskiy) Range
    		Yu. A. Uvarova et al.: Canadian Mineralogist 42:1005-1011 (2004)
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