title: Shkatulkalite, a rare mineral from the Lovozero Massif, Kola Peninsula: A re-investigation
metadata.name: dc.date.accessioned
metadata.value: 2020-09-09T07:35:23Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2020-09-09T07:35:23Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2018
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/19312
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The crystal structure of shkatulkalite has been solved from the crystal from the Lovozero
  alkaline massif, Kola Peninsula, Russia. The mineral is monoclinic, P2/m, a = 5.4638(19), b = 7.161(3),
  c = 15.573(6) Å, b = 95.750(9) , V = 606.3(4) Å3, R1 = 0.080 for 1551 unique observed reflections. The
  crystal structure is based upon the HOH blocks consisting of one octahedral (O) sheet sandwiched
  between two heteropolyhedral (H) sheets. The blocks are parallel to the (001) plane and are separated
  from each other by the interlayer space occupied by Na1 atoms and H2O groups. The Na2, Na3,
  and Ti sites are located within the O sheet. The general formula of shkatulkalite can be written
  as Na5(Nb1􀀀xTix)2(Ti1􀀀yMn2+
  y)[Si2O7]2O2(OH)2 nH2O, where x + y = 0.5 and x   y   0.25 for
  the sample studied. Shkatulkalite belongs to the seidozerite supergroup and is a member of the
  lamprophyllite group. The species most closely related to shkatulkalite are vuonnemite and epistolite.
  The close structural relations and the reported observations of pseudomorphs of shkatulkalite after
  vuonnemite suggest that, at least in some environments, shkatulkalite may form as a transformation
  mineral species.
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Shkatulkalite, a rare mineral from the Lovozero Massif, Kola Peninsula: A re-investigation
metadata.lang: en_GB
resources.filename: 10.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/19312/1/10.pdf
resources.format: Adobe PDF
resources.size: 2,58 MB