Cejkaite is a mineral that belongs to the pyroxene group. Its chemical formula is Na4Mg9Fe8 2+ (Si12O36)2, and it usually occurs in metamorphic rocks. The word "cejkaite" is pronounced /ˈtʃeɪkəaɪt/, with stress on the second syllable. The "c" is pronounced as "ch" (/tʃ/), the "j" is pronounced as "y" (/j/), and the stress falls on the second syllable. Meanwhile, the "a" sounds like the "ai" in "air" (/eɪ/). The spelling of "cejkaite" follows the conventions of English spelling, which can sometimes be confusing due to the phonetic irregularity of the language.
Cejkaite is a mineral that belongs to the pyroxene group and has the chemical formula (Na,K)A[Sb5+O3]6(SO4)(H2O)4. It was named after renowned Russian geographer and mineralogist Pavel Petrovich Cejka. Cejkaite typically forms as small, thin, and tabular crystals, which can be colorless or white. Its crystal system is monoclinic, and it usually exhibits a vitreous to pearly luster on cleavage surfaces.
This mineral has a hardness of about 3.5 on the Mohs scale, making it relatively soft. It is also quite brittle, with a perfect {110} cleavage and an uneven fracture. Cejkaite is transparent to translucent, and it has a white streak. It has a density of approximately 3.4 g/cm3.
Cejkaite is an uncommon mineral that is primarily found in hydrothermal veins deposited in oxidized antimony deposits associated with volcanism. It usually occurs alongside other antimony minerals such as stibiconite and cervantite.
Due to its relatively rare occurrence and limited applications, cejkaite does not have any significant commercial uses. However, it is of considerable interest within the field of mineralogy and is highly valued by mineral collectors. Its unique crystal structure and association with antimony deposits make it a mineral of scientific curiosity and importance.