Ekplexite
A variety of Valleriite Group
What is 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, kaskasite (molybdenum-analogue) and manganokaskasite (molybdenum- and manganese-analogue). All three minerals belong to the valleriite group, and crystallize in the trigonal system with similar possible space groups.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Ekplexite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Ekplexite Localities Map
See where Ekplexite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Composition of Ekplexite
Crystal structure of ekplexite is described as non-commensurate. It is composed of two modules: MeS2 sulfide module brucite-like (hydroxide) module
Quick Facts
Physical Properties
- Color
- Iron-black
- Hardness (Mohs)
- 1
- Density
- 3.63 g/cm³
Chemical Properties
- Chemical Formula
- (Nb,Mo,W)S2·(Mg1-xAlx)(OH)2+x
- Elements
- Al, H, Mg, Mo, Nb, O, S, W
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Ekplexite FAQs
How do I identify Ekplexite?
Ekplexite can be identified by its hardness of 1 on the Mohs scale, Iron-black color. Look for these key characteristics when examining specimens.
What color is Ekplexite?
Ekplexite typically appears in Iron-black. Color can vary depending on impurities and formation conditions.
How hard is Ekplexite?
Ekplexite has a hardness of 1 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the composition of ekplexite of Ekplexite?
Crystal structure of ekplexite is described as non-commensurate. It is composed of two modules: MeS2 sulfide module brucite-like (hydroxide) module