Geographic Minerals
Ilyukhinite
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…
Article
Mathematic
Dihedral Angle
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…
Geographic Minerals
Ikranite: Properties and Occurrences
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([…
Geographic Minerals
Golyshevite: Properties and Occurrences
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…
Geographic Minerals
Georgbarsanovite
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…
Mathematic
Angle between a Straight Line and a Plane
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…
Geographic Minerals
Ferrokentbrooksite
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,…
Geographic Minerals
Fengchengite
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…
Geographic Minerals
Feklichevite
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,…
Mathematic
Orthogonal Projection
Orthogonal Projection: A projection of a figure by parallel rays. In such a projection, tangencies are preserved. Parallel lines project to parallel lines. The ratio…
Geographic Minerals
Dualite: Properties and Occurrences
Dualite is a very rare and complex mineral of the eudialyte group, its complexity being expressed in its formula: Na30(Ca, Na, Ce, Sr)12(Na, Mn, Fe,…
Geographic Minerals
Davinciite: Properties and Occurrence
Davinciite is a very rare mineral of the eudialyte group, with the simplified formula Na12K3Ca6Fe32+Zr3(Si2O73OH)Cl2. The formula given does not show the presence of cyclic…
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