Agakhanovite-(Y)
A valid IMA mineral species
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About Agakhanovite-(Y)
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.
Type Locality:
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.
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 Identifiers
Mindat ID:
45953
Long-form identifier:
mindat:1:1:45953:0
GUID
(UUID V4):
(UUID V4):
22459246-cb0f-4690-931f-03303f27b2f4
IMA Classification of Agakhanovite-(Y)
Classification of Agakhanovite-(Y)
9.CM.
9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
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 |
---|---|---|
Agk-Y | IMA–CNMNC | Warr, 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)
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed
Fracture:
Conchoidal
Density:
2.672 g/cm3 (Calculated)
Optical Data of Agakhanovite-(Y)
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.
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Chemistry of Agakhanovite-(Y)
Mindat Formula:
K◻2(YCa)Be3[Si12O30]
Crystallography of Agakhanovite-(Y)
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 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) |
---|---|---|---|---|---|---|---|
0020413 | Agakhanovite-(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 2084-2088 | 2014 | Heftetjern pegmatite, Tordal, Norway | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Agakhanovite-(Y)
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)
Other Language Names for Agakhanovite-(Y)
German:Agakhanovit-(Y)
Relationship of Agakhanovite-(Y) to other Species
Member of:
Other Members of this group:
Almarudite | K◻2Mn2+2(Be2Al)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm |
Aluminosugilite | KNa2Al2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Armenite | Ba(H2O)2Ca2Al3[Al3Si9O30] | Orth. mmm (2/m 2/m 2/m) : Pnna |
Berezanskite | K◻2Ti2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Brannockite | K◻2Sn2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Chayesite | K◻2Mg2(Mg2Fe3+)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Darapiosite | KNa2Mn2(Zn2Li)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Dusmatovite | K(K◻)Mn2+2Zn3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Eifelite | KNa2(MgNa)Mg3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Friedrichbeckeite | K(◻Na)Mg2(Be2Mg)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Klöchite | K◻2(Fe2+Fe3+)Zn3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
Laurentthomasite | K◻2Mg2(Be2Al)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Merrihueite | K(◻Na)Fe2+2Fe2+3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Milarite | K(◻H2O)Ca2(Be2Al)[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Oftedalite | K◻2(ScCa)Be3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Osumilite | K◻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 |
Poudretteite | K◻2Na2B3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Roedderite | K(◻Na)Mg2Mg3[Si12O30] | Hex. 6 m2 : P62c |
Shibkovite | K(◻K)Ca2Zn3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Sogdianite | K◻2Zr2Li3[Si12O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Sugilite | KNa2Fe3+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:KMnNaZn | K(KNa0.5◻0.5)(Mn1.5Na0.5)Zn3[Si12O30] | Hex. |
Unnamed (Mn3+-dominant analog of Sugilite) | KNa2Mn3+2Li3[Si12O30] | |
Yagiite | Na◻2Mg2Al3[Al2Si10O30] | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
Common Associates
Associated Minerals Based on Photo Data:
6 photos of Agakhanovite-(Y) associated with Milarite | K(◻H2O)Ca2(Be2Al)[Si12O30] |
1 photo of Agakhanovite-(Y) associated with Cleavelandite | Na(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
9.CM.05 | Armenite | Ba(H2O)2Ca2Al3[Al3Si9O30] |
9.CM.05 | Brannockite | K◻2Sn2Li3[Si12O30] |
9.CM.05 | Chayesite | K◻2Mg2(Mg2Fe3+)[Si12O30] |
9.CM.05 | Darapiosite | KNa2Mn2(Zn2Li)[Si12O30] |
9.CM.05 | Eifelite | KNa2(MgNa)Mg3[Si12O30] |
9.CM.05 | Merrihueite | K(◻Na)Fe2+2Fe2+3[Si12O30] |
9.CM.05 | Milarite | K(◻H2O)Ca2(Be2Al)[Si12O30] |
9.CM.05 | Osumilite-(Mg) | K◻2Mg2Al3[Al2Si10O30] |
9.CM.05 | Osumilite | K◻2Fe2+2Al3[Al2Si10O30] |
9.CM.05 | Poudretteite | K◻2Na2B3[Si12O30] |
9.CM.05 | Roedderite | K(◻Na)Mg2Mg3[Si12O30] |
9.CM.05 | Sogdianite | K◻2Zr2Li3[Si12O30] |
9.CM.05 | Sugilite | KNa2Fe3+2Li3[Si12O30] |
9.CM.05 | Yagiite | Na◻2Mg2Al3[Al2Si10O30] |
9.CM.05 | Berezanskite | K◻2Ti2Li3[Si12O30] |
9.CM.05 | Dusmatovite | K(K◻)Mn2+2Zn3[Si12O30] |
9.CM.05 | Shibkovite | K(◻K)Ca2Zn3[Si12O30] |
9.CM.05 | Almarudite | K◻2Mn2+2(Be2Al)[Si12O30] |
9.CM.05 | Trattnerite | ◻(◻)2Fe3+2Mg3[Si12O30] |
9.CM.05 | Oftedalite | K◻2(ScCa)Be3[Si12O30] |
9.CM.05 | Klöchite | K◻2(Fe2+Fe3+)Zn3[Si12O30] |
9.CM.05 | Friedrichbeckeite | K(◻Na)Mg2(Be2Mg)[Si12O30] |
9.CM.05 | UM1990-73-SiO:KMnNaZn | K(KNa0.5◻0.5)(Mn1.5Na0.5)Zn3[Si12O30] |
9.CM.05 | Laurentthomasite | K◻2Mg2(Be2Al)[Si12O30] |
9.CM.9.CM. | Aluminosugilite | KNa2Al2Li3[Si12O30] |
9.CM.10 | Faizievite | K2Na(Ca6Na)Ti4Li6[Si6O18]2[Si12O30]F2 |
Fluorescence of Agakhanovite-(Y)
Does not fluoresce under ultraviolet light
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 Agakhanovite-(Y)
mindat.org URL:
https://www.mindat.org/min-45953.html
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References for Agakhanovite-(Y)
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) New minerals and nomenclature modifications approved in 2013. CNMNC Newsletter No 18. Mineralogical Magazine, 77 (8) 3249-3258 doi:10.1180/minmag.2013.077.8.15
Hawthorne, Frank C., Abdu, Yassir A., Ball, Neil A., Černý, Petr, Kristiansen, Roy (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 (10) 2084-2088 doi:10.2138/am-2014-4880
Localities for Agakhanovite-(Y)
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.
Australia | |
| Spandler et al. (2016) |
Brazil | |
| Lapis 3/2022 page 24 to 27 (in german) |
Czech Republic | |
| Novák et al. (2015) |
| Novák et al. (2016) |
Norway (TL) | |
| Williams et al. (2013) +2 other references |
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Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway