Feldspars
Feldspars (LiAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8) are a group of rock-forming tectosilicate minerals that make up about 41% of the Earth’s continental crust by weight.…
Science
Fayalite: Properties and Occurrence
Fayalite (Fe2SiO4), also called iron chrysolite, is the iron-rich end-member of the olivine solid-solution series. It is a black or brown mineral which is an…
Faustite: Properties and Occurrences
Faustite is a massive, bright green, zinc-rich member of the Turquoise group that is mined near Neynschabour, Iran. It is a triclinic-pinacoidal apple-green mineral containing…
Faujasite: Properties and Occurrences
Faujasite is a mineral group in the zeolite family of silicate minerals. It is a zeolite mineral consisting of sodalite cages connected through hexagonal prisms.…
Farneseite
Farneseite is a mineral from the cancrinite sodalite group with 14 layer stacking. It is a complex silicate mineral with formula: (Na, Ca, K)56(Al6Si6O24)7(SO4)12·6H2O. It…
Fabianite: Properties and Occurrences
Fabianite is a borate mineral with the chemical formula CaB3O5(OH). It is a monoclinic-prismatic colorless mineral containing boron, calcium, hydrogen, and oxygen. It was named…
Emerald: Properties and Occurrences
Emerald is a precious gemstone and a variety of the mineral beryl [Be3Al2(SiO3)6] colored green by trace amounts of chromium and sometimes vanadium. It is…
Hydrokenoelsmoreite
Hydrokenoelsmoreite is a hydrous tungsten oxide mineral with formula □2W2O6(H2O). It forms from the oxidation of ferberite within granitic pegmatite dykes and in pegmatitic greisen…
Eveslogite
Eveslogite (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)14Si48O144](F,OH,Cl)14] is a complex inosilicate mineral found on Mt. Eveslogchorr in Khibiny massif, Kola Peninsula, Russia. It is a monoclinic-prismatic mineral containing aluminum, barium,…
Evenkite: Properties and Occurrences
Evenkite is a rare hydrocarbon mineral with formula (CH3)2(CH2)22 or C24H50. Chemically it is n-tetracosane. It is a rare hydrocarbon mineral. It was first discovered…
Eveite: Properties and Occurrences
Eveite is a manganese arsenate mineral in the olivenite group. Its chemical formula is Mn2AsO4OH. It is an orthorhombic-dipyramidal apple-green mineral containing arsenic, hydrogen, manganese,…
Theorem of Three Perpendiculars
Theorem of Three Perpendiculars A line is said to be perpendicular to another line if the two lines intersect at a right angle. Explicitly, a…
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