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…
Science
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…
Euxenite-(Y)
Euxenite or euxenite-(Y) is a brownish black mineral with a metallic luster. It is a mineral that is sometimes called a “trash can mineral”. Because…
Zirsilite-(Ce)
Zirsilite-(Ce) is a very rare mineral of the eudialyte group, with formula (Na,[])12(Ce, Na)3 Ca6 Mn3Zr3NbSi(Si9O27)2(Si3O9)2O(OH)3(CO3)•H2O. The original formula was extended to show the presence…
Voronkovite
Voronkovite is a very rare mineral of the eudialyte group with the formula Na15(Na, Ca, Ce)3(Mn, Ca)3Fe3Zr3Si2Si24O72(OH, O)4Cl·H2O. It is a trigonal-pyramidal yellowish-brown mineral containing…
Converse of the Theorem on Parallel Lines and Plane
Converse of the theorem on parallel lines and plane: Theorem: If two straight lines are parallel and if one of them is perpendicular to a…
Taseqite: Properties and Occurrences
Taseqite is a rare mineral of the eudialyte group, with formula Na12Sr3Ca6Fe3Zr3NbSiO(Si9 O27)2(Si3O9)2(O, OH, H2O)3Cl2. It occurs in a cavity in a late-stage hydrothermal albitite…
Rastsveatevite
Rastsveatevite is a rare mineral of the eudialyte group with the formula Na27K8Ca12Fe3Zr6Si4[Si3O9]4[Si9O27]4(O, OH, H2O)6Cl2. It is a trigonal-ditrigonal pyramidal pink mineral containing calcium, chlorine,…
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