NIOCALITE Meaning and
Definition
-
Niocalite is a rare mineral that belongs to the pyrochlore group. It is classified as a complex oxide mineral with the chemical formula (Na,Ca)2Nb2O6(OH,F). Niocalite typically forms as transparent to translucent, dark brown to black octahedral crystals with a submetallic luster. It possesses an isometric crystal system, meaning it forms in perfect cubes or octahedrons.
The name niocalite is derived from its composition, which includes niobium (Nb) and alkaline elements (Na and Ca). It typically occurs in alkaline pegmatites and carbonatites, which are igneous rocks formed from magma with high concentrations of alkali elements and carbonates.
Niocalite has a hardness of about 5.5 on the Mohs scale, making it relatively resistant to scratching. Its specific gravity ranges from 3.5 to 3.9, indicating a moderately heavy mineral. When viewed under a polarized light microscope, niocalite displays distinct anisotropy due to its strong birefringence.
Due to its rarity and limited occurrence, niocalite does not have significant economic importance. However, it is highly valued among mineral collectors and enthusiasts for its unique crystal form and striking colors. The presence of niobium also adds to its appeal, as niobium has valuable applications in various industries, including aerospace, electronics, and superconductivity.
In summary, niocalite is a rare, complex oxide mineral found in alkaline pegmatites and carbonatites. Its crystal structure consists of octahedral, dark brown to black crystals with a submetallic luster. It is prized by collectors for its unique appearance and contains valuable niobium.
Etymology of NIOCALITE
The word "niocalite" is derived from the chemical element niobium, also known as columbium, and the mineral name "alite".
Niobium's name is connected to the Greek mythological figure Niobe, the daughter of Tantalus, as it is believed to have been named after her due to the similar properties with tantalum. The name "niobium" was coined by the English chemist Charles Hatchett in 1801.
The term "alite" refers to a group of minerals known as aluminous minerals. It comes from the Latin word "alumen" meaning "potassium aluminum sulfate" and was later adopted in mineralogy as a suffix for minerals containing aluminum.
