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Yakovenchukite-(Y)

Formula:
K
 
3
NaCaY
 
2
[Si
 
12
O
 
30
] · 4H
 
2
O
System:OrthorhombicColour:Creamy to colourless
Hardness:5
Name:After Victor N. Yakovenchuk, Russian mineralogist at the Geological Institute of the Kola Science centre of the Russian Academy of Sciences, in view of his outstanding contributions to the mineralogy of alkaline and alkaline-ultrabasic massifs.


A secondary low-temperature hydrothermal mineral formed by alteration of earlier REE-rich minerals

A mineral with a new structure type of minerals and inorganic compounds based on a microporous octahedral-tetrahedral framework of SiO4-tetrahedra and YO6-octahedra. Silicate tetrahedra share corners to form unprecedented Si12O30 sheets consisting of 4-, 6-, and 14-membered rings. The sheets are parallel to (001) and are linked into a 3-dimensional framework through YO6 octahedra. CA2+, K+, and Na+ cations are located within the framework cavities. The framework possesses channels extending along the a axis.

Classification of Yakovenchukite-(Y)

IMA status:Approved 2006
Strunz 8th edition ID:8/0.0-
Nickel-Strunz 10th (pending) edition ID:9.EF.30

9 : SILICATES (Germanates)
E : Phyllosilicates
F : Single nets with 6-membered rings, connected by M[4], M[8], etc.
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Type Occurrence of Yakovenchukite-(Y)

Type Locality:Vein No. 46, Kirovskii apatite mine (Kirovsky Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type Material:Small prismatic crystals.
Year of Discovery:2006
Geological Setting of type material:Narrow sodalite-aegirine-microcline veinlet cutting ijolite-urtite in an alkaline massif.
Associated Minerals at type locality:
StrontianiteStrontianiteSodaliteRinkitePyrochlore
MolybdeniteMolybdeniteMicroclineLithargeLead
GalenaFluoriteApophyllite-(KF)Donnayite-(Y)Catapleiite
CalciteAegirine

Physical Properties of Yakovenchukite-(Y)

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Creamy to colourless
Streak:White
Hardness (Mohs):5
Tenacity:Brittle
Cleavage:Perfect
On {100}, perfect; on {010}, distinct.
Fracture:Step-Like
Density (measured):2.83 g/cm3
Density (calculated):2.72 g/cm3

Crystallography of Yakovenchukite-(Y)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pcca (P21/c 2/c 2/a)
Cell Parameters:a = 14.972Å, b = 14.137Å, c = 14.594Å
Ratio:a:b:c = 1.059 : 1 : 1.032
Unit Cell Volume:V 3,088.95 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
7.00 (4)
6.57 (6)
5.25 (3)
4.20 (5)
3.337 (10)
3.248 (9)
3.101 (4)

Optical Data of Yakovenchukite-(Y)

Type:Biaxial (+)
Pleochroism:Non-pleochroic

Chemical Properties of Yakovenchukite-(Y)

Formula:
K
 
3
NaCaY
 
2
[Si
 
12
O
 
30
] · 4H
 
2
O
Essential elements:
All elements listed in formula:Ca, H, K, Na, O, Si, Y

Relationship of Yakovenchukite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):
9.EF.05Petalite
LiAlSi
 
4
O
 
10
9.EF.10Sanbornite
Ba
 
2
[Si
 
4
O
 
10
]
9.EF.15Searlesite
NaBSi
 
2
O
 
5
(OH)
 
2
9.EF.20Silinaite
NaLiSi
 
2
O
 
5
·2H
 
2
O
9.EF.25Kanemite
NaHSi
 
2
O
 
4
(OH)
 
2
·2H
 
2
O

Other Names for Yakovenchukite-(Y)

Synonyms:
IMA2006-002

Other Information

Fluorescence in UV light:Non-fluorescent.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Yakovenchukite-(Y)

Reference List:Krivovichev, S.V., Pakhomovsky, Ya.A., Ivanyuk, G.Yu., Mikhailova, J.A., Men’shikov, Yu.P., Armbruster, Th., Selivanova, E.A., Meisser, N. (2007): Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny massif, Kola Peninsula, Russia: A novel type of octahedral-tetrahedral open-framework structure. American Mineralogist, 92, 1525-1530.

Internet Links for Yakovenchukite-(Y)

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    Localities for Yakovenchukite-(Y)

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
            • Kukisvumchorr Mt
              • Kirovskii apatite mine (Kirovsky Mine; Kirov Mine)
    		American Mineralogist, Volume 92, pages 1525-1530, 2007
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