Arapovite
A valid IMA mineral species
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About Arapovite
Formula:
(K1-x◻x)(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 Yuri Alexandrovich Arapov (Юрий Александрович Арапов) (1907-1988), Russian geologist and petrographer, who worked in the Turkestan-Alay Range.
Steacyite Group. The uranium analogue of Turkestanite.
Compare 'UM1981-24-SiO:CaU', 'UM1981-25-SiO:CaU', 'UM1981-26-SiO:CaU', 'UM1981-28-SiO:CaU' and 'UM1982-17-SiO:CaTiU'.
Compare 'UM1981-24-SiO:CaU', 'UM1981-25-SiO:CaU', 'UM1981-26-SiO:CaU', 'UM1981-28-SiO:CaU' and 'UM1982-17-SiO:CaTiU'.
Unique Identifiers
Mindat ID:
27530
Long-form identifier:
mindat:1:1:27530:9
GUID
(UUID V4):
(UUID V4):
f9f538f3-cb72-4ab3-93a5-283f22e05830
IMA Classification of Arapovite
Approved
IMA Formula:
(K1-x◻x)(Ca,Na)2U4+Si8O20 [x ≈ 0.5]
Approval year:
2003
First published:
2004
Classification of Arapovite
9.CH.10
9 : SILICATES (Germanates)
C : Cyclosilicates
H : [Si4O12]8- 4-membered double rings
9 : SILICATES (Germanates)
C : Cyclosilicates
H : [Si4O12]8- 4-membered double rings
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Apv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Arapovite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Arapovite
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 Arapovite
Type:
Uniaxial (-)
RI values:
nω = 1.615(2) 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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Chemistry of Arapovite
Mindat Formula:
(K1-x◻x)(Ca,Na)2U4+Si8O20 (x ~ 0.5)
Crystallography of Arapovite
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.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005955 | Arapovite | Uvarova Y A, Sokolova E V, 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 The Canadian Mineralogist 42 1005-1011 | 2004 | Dara-i-Pioz moraine, Tien-Shan Mountains, Tajikistan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
5.34 Å | (23) |
5.28 Å | (38) |
3.37 Å | (100) |
3.31 Å | (59) |
2.640 Å | (64) |
2.515 Å | (21) |
2.161 Å | (45) |
2.016 Å | (29) |
1.644 Å | (30) |
Comments:
From type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Arapovite
General Appearance of Type Material:
Zonal areas 0.1-0.3 mm width in turkestanite crystals.
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
Polylithionite-aegirine-microcline rock.
Associated Minerals at Type Locality:
Reference:
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-x∅ x)Si8O20·H2O – new mineral. New Data on Minerals: 39: 14-20.
Synonyms of Arapovite
Other Language Names for Arapovite
Relationship of Arapovite to other Species
Member of:
Other Members of this group:
Iraqite-(La) | KCa2(La,Ce,Th)Si8O20 | Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc |
Steacyite | K0.3(Na,Ca)2ThSi8O20 | Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc |
Turkestanite | (K,◻)(Ca,Na)2ThSi8O20 · nH2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc |
Common Associates
Associated Minerals Based on Photo Data:
2 photos of Arapovite associated with Ursilite | (Mg/Ca)4(UO2)4(Si2O5)5.5(OH)5 · 13H2O |
1 photo of Arapovite associated with Turkestanite | (K,◻)(Ca,Na)2ThSi8O20 · nH2O |
Related Minerals - Strunz-mindat Grouping
9.CH.05 | Hyalotekite | (Ba,Pb,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl) |
9.CH.05 | Kapitsaite-(Y) | (Ba,K,Pb)4(Y,Ca)2Si8(B,Si)4O28F |
9.CH.05 | Itsiite | Ba4Ca2[Si8B4O28]◻ |
9.CH.05 | Khvorovite | (Pb,Ba,K)4Ca2[Si8B2(Si,B)2O28]F |
9.CH.10 | Iraqite-(La) | KCa2(La,Ce,Th)Si8O20 |
9.CH.10 | Steacyite | K0.3(Na,Ca)2ThSi8O20 |
9.CH.10 | Turkestanite | (K,◻)(Ca,Na)2ThSi8O20 · nH2O |
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.
Internet Links for Arapovite
mindat.org URL:
https://www.mindat.org/min-27530.html
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References for Arapovite
Reference List:
Agakhanov, Atali A., Pautov, Leonid A., Uvarova, Yulia A., Sokolova, Elena V., Hawthorne, Frank C., Karpenko, Vladimir Yu., Dusmatov, Vyacheslav D., Semenov, Eugenii I. (2004) Arapovite, (U,Th)(Ca,Na)2(K1-x◻x)Si8O20·H2O, — new mineral. New Data on Minerals, 39. 14-20
Agakhanov, Atali A., Pautov, Leonid A., Uvarova, Yulia A., Sokolova, Elena V., Hawthorne, Frank C., Karpenko, Vladimir Yu., Dusmatov, Vyacheslav D., Semenov, Eugenii I. (2004) Arapovite, (U,Th)(Ca,Na)2(K1-x◻x)Si8O20·H2O, — new mineral. New Data on Minerals, 39. 14-20
Localities for Arapovite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Tajikistan (TL) | |
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan