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Shakhdaraite-(Y)
A valid IMA mineral species
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About Shakhdaraite-(Y)
Formula:
ScYNb2O8
Colour:
Black to dark-brown
Lustre:
Vitreous, Sub-Metallic
Hardness:
5
Specific Gravity:
5.602 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named after the Shakhdara river valley, Tajikistan where the type locality occurs.
Type Locality:
Isostructural with:
Isostructural with samarskite-(Y), its Fe(III) analogue.
Structurally related to brookite. Unique combination of elements (at the upload).
Associates with an unnamed Sc-Nb oxide, among others.
Structure details:
* [6]M(1) = Nb
* [6]M(2) = Sc
* [8]M(3) = Y
* M(1) and M(2) form brookite-type chains || c
* [8]M(3A) polyhedra form a brookite-like kinked chain, which shares two edges with two M(3A) polyhedra from the adjacent brookite-like chain β [Y2O8]10β layer
* the brookite chains and the M(3A) polyhedral layer alternate along a.
Structurally related to brookite. Unique combination of elements (at the upload).
Associates with an unnamed Sc-Nb oxide, among others.
Structure details:
* [6]M(1) = Nb
* [6]M(2) = Sc
* [8]M(3) = Y
* M(1) and M(2) form brookite-type chains || c
* [8]M(3A) polyhedra form a brookite-like kinked chain, which shares two edges with two M(3A) polyhedra from the adjacent brookite-like chain β [Y2O8]10β layer
* the brookite chains and the M(3A) polyhedral layer alternate along a.
Unique Identifiers
Mindat ID:
55036
Long-form identifier:
mindat:1:1:55036:1
IMA Classification of Shakhdaraite-(Y)
Approved
IMA Formula:
ScYNb5+2O8
First published:
2022
Leskhozovskiy granitic pegmatite, Shakhdara Range, Roshtqal'a, Gorno-Badakhshan, Tajikistan