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Agakhanovite-(Y)

A valid IMA mineral species
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About Agakhanovite-(Y)Hide

05202440014949378606976.jpg
Atali Al Agakhanov
Formula:
K◻2(YCa)Be3[Si12O30]
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. The suffix follows the Levinson rule for minerals with essential REE, denoting predominant yttrium.
Milarite Group. Unique combination of elements (status: 2023).
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.


Unique IdentifiersHide

Mindat ID:
45953
Long-form identifier:
mindat:1:1:45953:0
GUID
(UUID V4):
22459246-cb0f-4690-931f-03303f27b2f4

IMA Classification of Agakhanovite-(Y)Hide

Approved
IMA Formula:
YCa◻2KBe3Si12O30
Approval year:
2013
First published:
2014

Classification of Agakhanovite-(Y)Hide

9.CM.

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
Agk-YIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Agakhanovite-(Y)Hide

Vitreous
Transparency:
Transparent
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

Chemistry of Agakhanovite-(Y)Hide

Mindat Formula:
K◻2(YCa)Be3[Si12O30]

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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0020413Agakhanovite-(Y)Hawthorne F C, Abdu Y A, Ball N A, Cerny P, Kristiansen R (2014) Agakhanovite-(Y), ideally (YCa)2KBe3Si12O30, a new milarite-group mineral from the Heftetjern pegmatite, Tordal, Southern Norway: description and crystal structure American Mineralogist 99 2084-20882014Heftetjern pegmatite, Tordal, Norway0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites

Type Occurrence of Agakhanovite-(Y)Hide

General Appearance of Type Material:
As aggregates or clusters up to 350 μm 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◻2Mn2+2(Be2Al)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
AluminosugiliteKNa2Al2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
ArmeniteBa(H2O)2Ca2Al3[Al3Si9O30]Orth. mmm (2/m 2/m 2/m) : Pnna
BerezanskiteK◻2Ti2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
BrannockiteK◻2Sn2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
ChayesiteK◻2Mg2(Mg2Fe3+)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DarapiositeKNa2Mn2(Zn2Li)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DusmatoviteK(K◻)Mn2+2Zn3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
EifeliteKNa2(MgNa)Mg3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
FriedrichbeckeiteK(◻Na)Mg2(Be2Mg)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
KlöchiteK◻2(Fe2+Fe3+)Zn3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
LaurentthomasiteK◻2Mg2(Be2Al)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
MerrihueiteK(◻Na)Fe2+2Fe2+3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
MilariteK(◻H2O)Ca2(Be2Al)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
OftedaliteK◻2(ScCa)Be3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
OsumiliteK◻2Fe2+2Al3[Al2Si10O30] Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Osumilite-(Mg)K◻2Mg2Al3[Al2Si10O30] Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
PoudretteiteK◻2Na2B3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
RoedderiteK(◻Na)Mg2Mg3[Si12O30]Hex. 6 m2 : P62c
ShibkoviteK(◻K)Ca2Zn3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SogdianiteK◻2Zr2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SugiliteKNa2Fe3+2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Trattnerite◻(◻)2Fe3+2Mg3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
UM1990-73-SiO:KMnNaZnK(KNa0.50.5)(Mn1.5Na0.5)Zn3[Si12O30]Hex.
Unnamed (Mn3+-dominant analog of Sugilite)KNa2Mn3+2Li3[Si12O30]
YagiiteNa◻2Mg2Al3[Al2Si10O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc

Common AssociatesHide

Associated Minerals Based on Photo Data:
6 photos of Agakhanovite-(Y) associated with MilariteK(◻H2O)Ca2(Be2Al)[Si12O30]
1 photo of Agakhanovite-(Y) associated with CleavelanditeNa(AlSi3O8)

Related Minerals - Strunz-mindat GroupingHide

9.CM.05ArmeniteBa(H2O)2Ca2Al3[Al3Si9O30]Orth. mmm (2/m 2/m 2/m) : Pnna
9.CM.05BrannockiteK◻2Sn2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ChayesiteK◻2Mg2(Mg2Fe3+)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DarapiositeKNa2Mn2(Zn2Li)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05EifeliteKNa2(MgNa)Mg3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05MerrihueiteK(◻Na)Fe2+2Fe2+3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05MilariteK(◻H2O)Ca2(Be2Al)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Osumilite-(Mg)K◻2Mg2Al3[Al2Si10O30] Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05OsumiliteK◻2Fe2+2Al3[Al2Si10O30] Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05PoudretteiteK◻2Na2B3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05RoedderiteK(◻Na)Mg2Mg3[Si12O30]Hex. 6 m2 : P62c
9.CM.05SogdianiteK◻2Zr2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05SugiliteKNa2Fe3+2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05YagiiteNa◻2Mg2Al3[Al2Si10O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05BerezanskiteK◻2Ti2Li3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DusmatoviteK(K◻)Mn2+2Zn3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ShibkoviteK(◻K)Ca2Zn3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05AlmaruditeK◻2Mn2+2(Be2Al)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.CM.05Trattnerite◻(◻)2Fe3+2Mg3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05OftedaliteK◻2(ScCa)Be3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05KlöchiteK◻2(Fe2+Fe3+)Zn3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.CM.05FriedrichbeckeiteK(◻Na)Mg2(Be2Mg)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05UM1990-73-SiO:KMnNaZnK(KNa0.50.5)(Mn1.5Na0.5)Zn3[Si12O30]Hex.
9.CM.05LaurentthomasiteK◻2Mg2(Be2Al)[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.9.CM.AluminosugiliteKNa2Al2Li3[Si12O30]Hex. 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.

Internet Links for Agakhanovite-(Y)Hide

References 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 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.
Australia
 
  • New South Wales
    • Gordon Co.
Spandler et al. (2016)
Brazil
 
  • Minas Gerais
    • Jaguaraçu
Lapis 3/2022 page 24 to 27 (in german)
Czech Republic
 
  • Central Bohemian Region
    • Kutná Hora District
Novák et al. (2015)
  • South Bohemian Region
    • Písek District
Novák et al. (2016)
Norway (TL)
 
  • Telemark
    • Drangedal
      • Tørdal
Williams et al. (2013) +2 other references
 
矿物 and/or 产地  
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