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Arapovite

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About ArapoviteHide

Formula:
(K1-xx)(Ca,Na)2U4+Si8O20 (x ~ 0.5)
Colour:
Dark-green
Lustre:
Vitreous
Hardness:
5½ - 6
Specific Gravity:
3.43
Crystal System:
Tetragonal
Member of:
Name:
Named after Yu. A. Arapov (Ю.А. Арапова) (1907-1988), Russian geologist and petrographer, who worked in the Turkestan-Alay Range.

Classification of ArapoviteHide

Approved
Approval Year:
2003
9.CH.10

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

Pronounciation of ArapoviteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ArapoviteHide

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

Optical Data of ArapoviteHide

Type:
Uniaxial (-)
RI values:
nω = 1.615() nε = 1.610(2)
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of ArapoviteHide

Formula:
(K1-xx)(Ca,Na)2U4+Si8O20 (x ~ 0.5)
IMA Formula:
(K1-xx)(Ca,Na)2U4+Si8O20 [x ≈ 0.5]

Crystallography of ArapoviteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/mcc
Cell Parameters:
a = 7.5505(4) Å, c = 14.7104(4) Å
Ratio:
a:c = 1 : 1.948
Unit Cell V:
838.64 ų (Calculated from Unit Cell)
Z:
2
Comment:
Made on partially annealed crystal.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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.

Type Occurrence of ArapoviteHide

Synonyms of ArapoviteHide

Other Language Names for ArapoviteHide

German:Arapovit
Simplified Chinese:阿渃波夫石
Traditional Chinese:阿渃波夫石

Relationship of Arapovite to other SpeciesHide

Member of:
Other Members of this group:
Iraqite-(La)KCa2(La,Ce,Th)Si8O20Tet.
SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
Turkestanite(K,◻)(Ca,Na)2ThSi8O20 · nH2OTet. 4/mmm (4/m 2/m 2/m) : P4/mcc

Common AssociatesHide

Associated Minerals Based on Photo Data:
Turkestanite1 photo of Arapovite associated with Turkestanite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.CH.05Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
9.CH.05Kapitsaite-(Y)(Ba,K,Pb)4(Y,Ca)2Si8(B,Si)4O28FTric. 1 : P1
9.CH.10Iraqite-(La)KCa2(La,Ce,Th)Si8O20Tet.
9.CH.10SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
9.CH.10Turkestanite(K,◻)(Ca,Na)2ThSi8O20 · nH2OTet. 4/mmm (4/m 2/m 2/m) : P4/mcc

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 ArapoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Agakhanov, A.A., Pautov, L.A., Uvarova, Y.A., Sokolova, E.V., Hawthorne, F.C., Karpenko, V.Y., Dusmatov, V.D., Semenov, E.I. (2004) Arapovite, (U,Th)(Ca,Na)2(K1-xx)Si8O20·H2O – new mineral. New Data on Minerals: 39: 14-20.
Uvarova, Yu. A., Sokolova, E., Hawthorne, F.C., Agakhanov, A.A., Pautov, L.A. (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., 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 ArapoviteHide

Localities for ArapoviteHide

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.
Tajikistan (TL)
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
Yu. A. Uvarova et al.: Canadian Mineralogist 42:1005-1011 (2004)
Mineral and/or Locality  
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