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Fluocerite is a mineral, a cerium, lanthanum fluoride, formula (Ce, La)F3. It is a mineral consisting of a reddish yellow fluoride of cerium and related…

Geometrical Property of Altitudes Sometimes the opposite side isn’t quite long enough to draw an altitude, so we are allowed to extend it to make…

Fluoborite has a chemical formula of Mg3(BO3)(F, OH)3. Fluoborite having a hexagonal crystal system was first described in 1926 from the Huerta del Vinagre mine,…

Fluellite is a mineral with the chemical formula Al2(PO4)F2(OH)•7H2O. It is a mineral consisting of aluminum fluoride in colorless or white crystals. It is an…

Altitude of a Triangle In geometry, an altitude of a triangle is a line segment through a vertex and perpendicular to a line containing the…

Fluckite is an arsenate mineral with the chemical formula CaMnH2(AsO4)2·2(H2O). It is a rare mineral of post-mine origin that forms as a low-temperature product of…

Fletcherite is a rare thiospinel sulfide mineral with formula Cu(Ni, Co)2S4. It is an isometric-hexoctahedral steel-gray mineral containing cobalt, copper, nickel, and sulfur. It is…

Fichtelite is a rare white mineral found in fossilized wood from Bavaria. It is a rare white monoclinic mineral found in fossilized wood from Bavaria.…

Fettelite, also known as sanguinite, is a mercury-sulfosalt mineral with the chemical formula Ag16HgAs4S15. It is a rare Silver Mercury Arsenic Sulfosalt forming silvery to…

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…

Orthorhombic ferroselite and its isometric polymorph dzharkenite are iron selenides of general formula FeSe2 precipitated under reducing conditions in anoxic environments. It is an orthorhombic-dipyramidal…

Ferropericlase or magnesiowüstite is a magnesium/iron oxide [(Mg, Fe)O] that is interpreted to be one of the main constituents of the Earth’s lower mantle together…