Geographic Minerals
Fourmarierite
Fourmarierite is a secondary uranium-lead mineral. It was named for the Belgian geologist Paul Fourmarier (1877–1970). It is a mineral consisting of a hydrous oxide…
Article
Mathematic
Direct Variation in Mathematics
“Variation” defines a concept that deals with variability in mathematics. Variation is defined by any change in some quantity due to change in another. We…
Geographic Minerals
Fougèrite: Properties and Occurrences
Fougèrite is a relatively recently described naturally occurring green rust mineral. It is a trigonal clay mineral that is chemically and structurally related to green…
Geographic Minerals
Forsterite: Properties and Occurrences
Forsterite (Formula- Mg2SiO4) is the magnesium-rich end-member of the olivine solid solution series. It is a crystalline magnesium silicate. It is best known for having,…
Geographic Minerals
Fornacite: Properties and Occurrence
Fornacite is a rare lead, copper chromate arsenate hydroxide mineral with the formula: Pb2Cu(CrO4)(AsO4)(OH). It is a monoclinic-prismatic mineral containing arsenic, chromium, copper, hydrogen, lead,…
Mathematic
Classification of Triangles on the Basis of their Angles
Triangle is a plane figure with three straight sides and three angles. The three angles always add to 180°. The vertex is a corner of the…
Geographic Minerals
Fluorite: Properties and Occurrence
Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF2. It is a halide mineral composed of calcium fluoride. It crystallizes in isometric…
Geographic Minerals
Fluorellestadite
Fluorellestadite is a rare nesosilicate of calcium, with sulfate and fluorine, with the chemical formula Ca10(SiO4)3(SO4)3F2. It is a rare nesosilicate of calcium, with sulfate…
Geographic Minerals
Fluororichterite
Fluororichterite is a rare amphibole with formula Na(NaCa)Mg5Si8O22F2. It was recognized by the International Mineralogical Association in 1994. Its name is derived from its fluorine…
Mathematic
Classification of Triangles on the Basis of their Sides
Triangle is a plane figure with three straight sides and three angles. The three angles always add to 180°. The vertex is a corner of the…
Geographic Minerals
Fluorcaphite: Properties and Occurrences
Fluorcaphite is a mineral with the chemical formula (Ca, Sr, Ce, Na)5(PO4)3F. It is a hexagonal-pyramidal mineral containing calcium, cerium, fluorine, oxygen, phosphorus, sodium, and…
Geographic Minerals
Fluorapophyllite
Fluorapophyllite is a mineral of the apophyllite group, with the chemical formula of KCa4Si8O20(F, OH)·8(H2O). It is a particular apophyllite mineral with more fluorine than…
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