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Agakhanovite-(Y)

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About Agakhanovite-(Y)Hide

05202440014949378606976.jpg
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
9.CM.

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)

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
6.877Å(56)
4.479Å(38)
4.134Å(84)
3.287Å(96)
3.214Å(27)
2.986Å(43)
2.865Å(100)
2.728Å(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

Other Language Names for Agakhanovite-(Y)Hide

Relationship of Agakhanovite-(Y) to other SpeciesHide

Member of:
Other Members of this group:
AlmaruditeK(◻,Na)2(Mn,Fe,Mg)2[(Be,Al)3Si12]O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
AluminosugiliteKNa2Al2Li3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
BerezanskiteKTi2Li3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
BrannockiteKSn2(Li3Si12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
ChayesiteK(Mg,Fe2+)4Fe3+[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DarapiositeKNa2Mn2(Li2ZnSi12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DusmatoviteKK2Mn2(Zn2LiSi12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
EifeliteKNa3Mg4Si12O30Hex.
FriedrichbeckeiteK(◻Na)Mg2(Be2Mg)Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Klöchite(Fe2+Fe3+)◻2KZn3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
Merrihueite(K,Na)2(Fe2+,Mg)5Si12O30Hex.
MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
OftedaliteKSc22Be3Si12O30Hex. 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)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
RoedderiteKNaMg2(Mg3Si12)O30Hex. 6 m2 : P62c
ShibkoviteK2Ca2(Zn3Si12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SogdianiteKZr2Li3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SugiliteKNa2Fe3+2(Li3Si12)O30Hex.
TrattneriteFe3+2(Mg3Si12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
UM1990-73-SiO:KMnNaZn(K,Na)2Zn3Mn1.5Si12O30Hex.
Unnamed (Mn3+-dominant analog of Sugilite)KNa2(Mn3+,Fe3+,Al)2Li3Si12O30
YagiiteNaMg2(AlMg2Si12)O30Hex. 6/mmm (6/m 2/m 2/m)

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Agakhanovite-(Y) associated with MilariteK2Ca4Al2Be4Si24O60 · H2O

Related Minerals - Nickel-Strunz GroupingHide

9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.CM.05BrannockiteKSn2(Li3Si12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ChayesiteK(Mg,Fe2+)4Fe3+[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DarapiositeKNa2Mn2(Li2ZnSi12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05EifeliteKNa3Mg4Si12O30Hex.
9.CM.05Merrihueite(K,Na)2(Fe2+,Mg)5Si12O30Hex.
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30Hex.
9.CM.05PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05RoedderiteKNaMg2(Mg3Si12)O30Hex. 6 m2 : P62c
9.CM.05SogdianiteKZr2Li3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05SugiliteKNa2Fe3+2(Li3Si12)O30Hex.
9.CM.05YagiiteNaMg2(AlMg2Si12)O30Hex. 6/mmm (6/m 2/m 2/m)
9.CM.05BerezanskiteKTi2Li3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DusmatoviteKK2Mn2(Zn2LiSi12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ShibkoviteK2Ca2(Zn3Si12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05AlmaruditeK(◻,Na)2(Mn,Fe,Mg)2[(Be,Al)3Si12]O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.CM.05TrattneriteFe3+2(Mg3Si12)O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05OftedaliteKSc22Be3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.9.CM.AluminosugiliteKNa2Al2Li3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[Si6O18]2[Si12O30]F2Tric. 1 : P1

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 Bohemian Region
    • Kutná Hora District
      • Zruč nad Sázavou
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.
  • South Bohemian Region
    • Písek District
Novák, M., Cícha, J., Čopjaková, R., Škoda, R., Vašinová Galiová, M (2016) Primary (magmatic?) and hydrothermal milarite-group minerals from the Velká skála pegmatite, Písek pegmatite district, Czech Republic. in Second Eugene E. Foord Pegmatite Symposium July 15-19, 2016 Colorado School of Mines campus, Golden, Colorad
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.
 
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