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Kentbrooksite is a moderately rare mineral of the eudialyte group, with formula (Na,REE)15(Ca,REE)6Mn3Zr3NbSi[(Si9O27)2(Si3O9)2O2]F2·2H2O. It is a trigonal-ditrigonal pyramidal yellowish-brown mineral containing calcium, fluorine, hydrogen, la, ce,…

Axioms: Solid Geometry Axioms involving reflection at a plane were approached through physical observations of reflection from a plane mirror. Axioms are general statements made…

Johnsenite-(Ce) is a very rare mineral of the eudialyte group, with formula Na12(Ce,La,Sr,Ca,[])3Ca6Mn3Zr3WSi(Si9O27)2(Si3O9)2(CO3)O(OH,Cl)2. It is a mineral containing calcium, chlorine, hydrogen, iron, oxygen, silicon, sodium,…

Ilyukhinite is a very rare mineral of the eudialyte group, with formula (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2·3H2O. The formula given is simplified and does not show the presence of…

The dihedral angle is an angle between two distinct planes that are intersecting in any way. We can say that the interior angle between two…

Ikranite is a member of the eudialyte group, named after the Shubinov Institute of Crystallography of the Russian Academy of Sciences. Formula – (Na,H3O)15(Ca,Mn,REE)6Fe23+ Zr3([…

Golyshevite is a rare mineral of the eudialyte group, with formula Na10Ca3Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2CO3(OH)3•H2O. It was named for Russian crystallographer Vladimir Mikhailovich Golyshev of the Mordvinian State…

Georgbarsanovite is a very rare mineral of the eudialyte group, formerly known under the unaccepted name as barsanovite, with formula Na12(Mn, Sr, REE)3Ca6Fe32+Zr3NbSi(Si3O9)2(Si9O27)2O4Cl2•H2O. The original…

Angle between a Straight Line and a Plane: In mathematics, the term “line” actually refers to the “straight line”. It is a one-dimensional figure that…

Ferrokentbrooksite is a moderately rare mineral of the eudialyte group, with formula Na15Ca6(Fe,Mn)3Zr3NbSi(Si3O9)2(Si9O27)2O(O,OH,H2O)3(Cl,F,OH)2. It is a trigonal-ditrigonal pyramidal mineral containing aluminum, calcium, chlorine, fluorine, hafnium,…

Fengchengite is a rare mineral of the eudialyte group with the formula Na12[]3(Ca, Sr)6Fe33+Zr3Si(Si24O73)(H2O, OH)3(OH, Cl)2. The formula is simplified as it does not show…

Feklichevite is a rare mineral of the eudialyte group with the formula Na11Ca9(Fe3+, Fe2+)2Zr3NbSi(Si3O9)2  (Si9O27)2. It is a trigonal-ditrigonal pyramidal mineral containing calcium, cerium, chlorine,…