Geographic Minerals

Carbokentbrooksite is a very rare mineral of the eudialyte group, with formula (Na,[])12(Na, Ce)3Ca6Mn3Zr3NbSiO(Si9O27)2(Si3O9)2(OH)3(CO3).H2O. It is a trigonal-ditrigonal pyramidal yellow mineral containing calcium, carbon, cerium,…

Aqualite is a very rare mineral of the eudialyte group, with formula (H3O)8(Na, K, Sr)5Ca6Zr3SiSi(Si24O66)(OH)9 Cl. The formula given does not show the presence of…

Andrianovite is a very rare mineral of the eudialyte group, with formula Na12(K, Sr, Ce)6Ca6(Mn, Fe)3Zr3NbSi(Si3O9)2(Si9O27)2O(O, H2O, OH)5. It was named after Valerii Ivanovich Andrianov,…

Eudialyte, whose name derives from the Greek phrase ‘eu dialytos’, meaning “well decomposable”, is a somewhat rare, nine-member ring cyclosilicate mineral, which forms in alkaline…

Eucryptite is lithium bearing aluminum silicate mineral with formula LiAlSiO4. It is one of the few silicate minerals that have a trigonal symmetry. This symmetry…

Euclase is a beryllium aluminum hydroxide silicate mineral [BeAlSiO4(OH)]. It is not a well-known gemstone but is more well known by mineral collectors. It crystallizes…

Euchroite is a hydrated copper arsenate hydroxide mineral with formula: Cu2AsO4OH·3H2O. It is a vitreous green to emerald green mineral crystallizing in the orthorhombic system.…

Ettringite is a hydrous calcium aluminum sulfate mineral with formula: Ca6Al2(SO4)3(OH)12·26H2O. It is a trigonal hydrous calcium aluminum sulfate mineral. is a hydrous calcium aluminum…

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Esperite is a rare complex calcium lead-zinc silicate [PbCa3Zn4(SiO4)4] related to beryllonite and trimerite that used to be called calcium larsenite. It is one of…

Eskolaite is an uncommon chromium oxide mineral (chromium(III) oxide Cr2O3). It is a somewhat rare chromium oxide in the Hematite group. It is a trigonal-hexagonal…

Erythrite or red cobalt is a secondary hydrated cobalt arsenate mineral with the formula [Co3(AsO4)2·8H2O]. is a wonderful mineral for people who like striking, unusual…