Geographic Minerals

Cuprosklodowskite is a secondary uranium mineral formed by alteration of earlier uranium minerals. Its empirical formula is Cu(UO2)2(HSiO4)2·6(H2O). It is a rare uranium mineral that…

Cuprite is an oxide mineral composed of copper(I) oxide Cu2O, and is a minor ore of copper. It is a dark red or brownish-black mineral…

Cupalite is a rare mineral which is mostly composed of copper and aluminum, but might contain up to several percents of zinc or iron; its…

Cubanite is a yellow mineral of copper, iron, and sulfur, CuFe2S3. It is an orthorhombic-dipyramidal mineral containing copper, iron, and sulfur. It is a rare…

Cryptomelane is a potassium manganese oxide mineral with formula K(Mn4+, Mn2+)8O16. It is a mineral consisting of an oxide of manganese and potassium, probably KMn8O16.H2O,…

Cryolite (Na3AlF6, sodium hexafluoroaluminate) is an uncommon mineral identified with the once large deposit at Ivigtût on the west coast of Greenland, depleted by 1987.…

Crossite is an inosilicate double chain sodic amphibole and is a rare silicate mineral belonging to the riebeckite group. It is an amphibole intermediate in…

Crookesite is a selenide mineral composed of copper and selenium with variable thallium and silver. It is a rare mineral, selenide of copper, thallium, and…

Cronstedtite is a complex iron silicate mineral belonging to the serpentine group of minerals. It has a formula of Fe2+2Fe3+(Si, Fe3+O5)(OH)4. It is a trigonal-ditrigonal…

Crocoite is a mineral consisting of lead chromate, PbCrO4, and crystallizing in the monoclinic crystal system. It is a rare bright orange mineral consisting of…

The mineral cristobalite is a high-temperature polymorph of silica, meaning that it has the same chemical formula as quartz, SiO2, but a distinct crystal structure.…

An interview is a face-to-face interaction between interviewer and interviewee. If conducted carefully and properly, it observes and appraises the suitability of the candidate to…