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Kentbrooksite is a moderately rare mineral of the eudialyte group, [2] with chemical formula (Na,REE) 15 (Ca,REE) 6 Mn 3 Zr 3 NbSi[(Si 9 O 27) 2 (Si 3 O 9) 2 O 2]F 2 ·2H 2 O. [3] This extended formula shows the presence of cyclic silicate groups and dominance of Si at the M4 site, according to the nomenclature of the eudialyte group. [4]
Ferrokentbrooksite is a moderately rare mineral of the eudialyte group, [2] with formula Na 15 Ca 6 (Fe,Mn) 3 Zr 3 NbSi 25 O 73 (O,OH,H 2 O) 3 (Cl,F,OH) 2. [3] The original formula was extended form to show the presence of cyclic silicate groups and presence of silicon at the M4 site, according to the nomenclature of eudialyte group. [4]
Carbokentbrooksite is a very rare mineral of the eudialyte group, [2] with formula (Na, ) 12 (Na,Ce) 3 Ca 6 Mn 3 Zr 3 NbSiO(Si 9 O 27) 2 (Si 3 O 9) 2 (OH) 3 (CO 3). H 2 O. [3] The original formula was extended to show the presence of cyclic silicate groups and silicon at the M4 site, according to the nomenclature of eudialyte group. [4]
Feklichevite is a rare mineral of the eudialyte group with the formula Na 11 Ca 9 (Fe 3+,Fe 2+) 2 Zr 3 NbSi(Si 3 O 9) 2 (Si 9 O 27) 2. [3] [2] The original formula was extended to show the presence of cyclic silicate groups and presence of silicon at the M4 site, according to the nomenclature of eudialyte group. [4]
With two shared oxides bound to each silicon, cyclic or polymeric structures can result. The cyclic metasilicate ring Si 6 O 12− 18 is a hexamer of SiO 3 2-. Polymeric silicate anions of can exist also as long chains. In single-chain silicates, which are a type of inosilicate, tetrahedra link to form a chain by sharing two oxygen atoms each.
Aqualite is a very rare mineral of the eudialyte group, with formula (H 3 O) 8 (Na,K,Sr) 5 Ca 6 Zr 3 SiSi(Si 24 O 66)(OH) 9 Cl. [2] [3] The formula given does not show the presence of cyclic silicate groups. The original formula was extended to show the presence of silicon at both M3 and M4 sites, according to the nomenclature of the eudialyte ...
Zirsilite-(Ce) is a very rare mineral of the eudialyte group, with formula (Na, ) 12 (Ce,Na) 3 Ca 6 Mn 3 Zr 3 NbSi(Si 9 O 27) 2 (Si 3 O 9) 2 O(OH) 3 (CO 3)·H 2 O. [2] [3] The original formula was extended to show the presence of cyclic silicate groups and the presence of silicon at the M4 site, according to the nomenclature of the eudialyte group. [4]
Khomyakovite is an exceedingly rare mineral of the eudialyte group, with formula Na 12 Sr 3 Ca 6 Fe 3 Zr 3 W(Si 25 O 73)(O,OH,H 2 O) 3 (OH,Cl) 2. [2] [3] The original formula was extended to show the presence of both the cyclic silicate groups and M4-site silicon, according to the nomenclature of the eudialyte group. [4]