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Agakhanovite-(Y)

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About Agakhanovite-(Y)Hide

Atali Al Agakhanov
Formula:
(YCa)□2KBe3Si12O30
Colour:
colorless
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
2.672 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
Named after Atali A. Agakhanov (b. 1971), mineralogist at the Fersman Mineralogical Museum, Moscow, Russia, who has worked on a wide variety of pegmatite minerals, and in particular on the minerals of the milarite group.
Milarite Group.
The Y-analog of oftedalite and the Y-Ca-Be analog of klöchite. In the end-member structure of agakhanovite-(Y), the A site is occupied equally by Y and Ca, and the B site is vacant.


Note:
Milarite with high yttrium content occurs as a rarity at the agakhanovite-(Y) type locality (Heftetjern Pegmatite, Norway). But only one sample, the holotype of agakhanovite-(Y), shows as much as ~10 wt% Y2O3.


Classification of Agakhanovite-(Y)Hide

Approved
Approval Year:
2013

Physical Properties of Agakhanovite-(Y)Hide

Vitreous
Colour:
colorless
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed
Fracture:
Conchoidal
Density:
2.672 g/cm3 (Calculated)

Optical Data of Agakhanovite-(Y)Hide

Type:
Uniaxial (-)
RI values:
nω = 1.567 nε = 1.564
Birefringence:
Calculated: 0.003
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of Agakhanovite-(Y)Hide

Formula:
(YCa)□2KBe3Si12O30
IMA Formula:
YCa◻2KBe3Si12O30

Crystallography of Agakhanovite-(Y)Hide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P6/mcc
Setting:
P6/mcc
Cell Parameters:
a = 10.3476(2) Å, c = 13.7610(3) Å
Ratio:
a:c = 1 : 1.33
Unit Cell V:
1276.02 ų
Z:
2
Morphology:
Prismatic along [001], and show the forms {100} and {100}.
Twinning:
No twinning was observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.877(56)
4.479(38)
4.134(84)
3.287(96)
3.214(27)
2.986(43)
2.865(100)
2.728(36)
Comments:
From Type Description.

Type Occurrence of Agakhanovite-(Y)Hide

General Appearance of Type Material:
As aggregates or clusters up to 350 μ wide consisting of colorless transparent crystals, or as tiny solitary hexagonal crystals partly on or between crystals of milarite. It occurs more rarely on the surface of kristiansenite.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Royal Ontario Museum, Toronto, Ontario, Canada, catalogue number M43863
Geological Setting of Type Material:
In miarolitic vug in a granitic pegmatite (late-stage, enriched in Y)
Associated Minerals at Type Locality:

Synonyms of Agakhanovite-(Y)Hide

Relationship of Agakhanovite-(Y) to other SpeciesHide

Member of:
Other Members of this group:
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
EifeliteKNa3Mg4Si12O30Hex.
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Klöchite(□Na)KFe2+2Zn3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
Merrihueite(K,Na)2(Fe,Mg)5Si12O30Hex.
MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30Hex.
Osumilite-(Mg)KMg2Al3(Al2Si10)O30 Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]Hex.
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
UM1990-73-SiO:KMnNaZn(K,Na)2Zn3Mn1.5Si12O30Hex.
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)

Common AssociatesHide

Associated Minerals Based on Photo Data:
Milarite1 photo of Agakhanovite-(Y) associated with Milarite on mindat.org.

Fluorescence of Agakhanovite-(Y)Hide

Does not fluoresce under ultraviolet light

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 Agakhanovite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hawthorne, F.C., Ball, N.A., Černý, P. and Kristiansen, R. (2013) Agakhanovite-(Y), IMA 2013-090. CNMNC Newsletter No. 18, December 2013, page 3256; Mineralogical Magazine, 77, 3249-3258
Hawthorne, F. C., Abdu, Y.A., Ball, N.A., Černý, P. & Kristiansen, R. (2014): Agakhanovite-(Y), ideally (YCa)□2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tørdal, Southern Norway: Description and crystal structure. American Mineralogist. 99, 2084-2088.

Internet Links for Agakhanovite-(Y)Hide

Localities for Agakhanovite-(Y)Hide

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.
Czech Republic
 
  • Central Bohemia Region
    • Zruč nad Sázavou (Srutsch an der Sasau)
Novák, M., Gadas, P., Kadlec, T. (2015): Vlastějovice near Zruč nad Sázavou. Anatectic amphibole-bearing pegmatites and tourmaline-bearing granite-pegmatite system (LCT, barren to elbaite-subtype) contaminated from host Fe-skarn. - In: Fieldtrip Guidebook - PEG 2015 - 7th International Symposium of Granitic Pegmatites. 33-40.
Norway (TL)
 
  • Telemark
    • Drangedal
      • Tørdal
Hawthorne, F.C., Ball, N.A., Černý, P. and Kristiansen, R. (2013) Agakhanovite-(Y), IMA 2013-090. CNMNC Newsletter No. 18, December 2013, page 3256; Mineralogical Magazine, 77, 3249-3258 ; Hawthorne, F. C., Abdu, Y.A., Ball, N.A., Černý, P. & Kristiansen, R. (2014): Agakhanovite-(Y), ideally (YCa)□2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tørdal, Southern Norway: Description and crystal structure. American Mineralogist. 99, 2084-2088.
Mineral and/or Locality  
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