Sovite is often a medium-to-coarse-grained calcite rock with variable accessory amphibole, biotite, pyrite, pyrochlore and fluorite.
12.
Ellsworthite is part of pyrochlore super group and the sub group betafite and was named after the Canadian Mineralogist and surveyor H . V . Ellsworth.
13.
A rare, soft, grey, ductile transition metal, niobium is found in the minerals pyrochlore ( the main source for niobium ) and columbite.
14.
Immobilising weapons-grade plutonium or transuranium wastes instead of bulk HLW may essentially change the Synroc phase composition to primarily zirconolite-based or a pyrochlore-based ceramic.
15.
Minerals found associated with these rocks include : pyroxenites, amphibole, apatite, biotite, calcite, magnetite, monazite, nepheline, pyrite, pyrochlore, pyroxene and quartz.
16.
The three largest currently mined deposits of pyrochlore, two in Brazil and one in Canada, were founded in the 1950s, and are still the major producers of niobium mineral concentrates.
17.
_The Security Council should immediately institute an embargo to halt the import or export of diamonds, gold, timber, coltan, niobium, pyrochlore and cassiterite to or from Burundi, Rwanda and Uganda.
18.
The book was financed by CBMM ( Companhia Brasileira de Metalurgia e Minera��o ), which owns the world's largest niobium ore ( pyrochlore ) mine, in the Barreiro area of Arax? Minas Gerais.
19.
The carbonatite contains the niobium rich pyrochlore; attempts to mine the carbonatite rock for niobium were carried out in the middle of the 20th century, but the amount turned out to be too small to be economical.
20.
In general frustration is caused either by competing interactions due to site disorder ( see also the " Villain model " or by lattice structure such as in the hexagonal-close-packed, tetrahedron, pyrochlore and kagome lattices with antiferromagnetic interaction.
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