Ekplexite
Ekplexite is a unique sulfide-hydroxide niobium-rich mineral with the formula (Nb,Mo)S2•(Mg1-xAlx)(OH)2+x. It is unique because niobium is usually found in oxide or, eventually, silicate minerals. Ekplexite is a case in which chalcophile behaviour of niobium is shown, which means niobium present in a sulfide mineral. The unique combination of elements in ekplexite has to do with its name, which comes from a Greek world on "surprise". The other example of chalcophile behaviour of niobium is edgarite, FeNb3S6, and both minerals were found in the same environment, which is a fenitic rock of Mt. Kaskasnyunchorr, Khibiny Massif, Kola Peninsula, Russia. Analysis of the same rock has revealed the presence of two analogues of ekplexite, (molybdenum-analogue) and (molybdenum- and manganese-analog
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Ekplexite
Ekplexite is a unique sulfide-hydroxide niobium-rich mineral with the formula (Nb,Mo)S2•(Mg1-xAlx)(OH)2+x. It is unique because niobium is usually found in oxide or, eventually, silicate minerals. Ekplexite is a case in which chalcophile behaviour of niobium is shown, which means niobium present in a sulfide mineral. The unique combination of elements in ekplexite has to do with its name, which comes from a Greek world on "surprise". The other example of chalcophile behaviour of niobium is edgarite, FeNb3S6, and both minerals were found in the same environment, which is a fenitic rock of Mt. Kaskasnyunchorr, Khibiny Massif, Kola Peninsula, Russia. Analysis of the same rock has revealed the presence of two analogues of ekplexite, (molybdenum-analogue) and (molybdenum- and manganese-analog
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Ekplexite is a unique sulfide- ...... similar possible space groups.
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category
class
cleavage
{001}, perfect
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color
Iron-black
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density
diaphaneity
Opaque
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habit
micaceous flakes , in lenticular nests
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impurities
W, V, Fe
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luster
Metallic
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name
Ekplexite
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pleochroism
light gray to dark gray
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symmetry
P321, P3m1, Pm1
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system
tenacity
Flexible
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unit cell
Z = 2
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a = 3.79, c = 11.3 [Å]
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subject
hypernym
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Ekplexite is a unique sulfide- ...... lybdenum- and manganese-analog
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label
Ekplexite
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name
Ekplexite
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