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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]
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.
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]
Cyclic compounds may or may not exhibit aromaticity; benzene is an example of an aromatic cyclic compound, while cyclohexane is non-aromatic. In organic chemistry, the term aromaticity is used to describe a cyclic (ring-shaped), planar (flat) molecule that exhibits unusual stability as compared to other geometric or connective arrangements of ...
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]
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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]
Silicon compounds are compounds containing the element silicon (Si). As a carbon group element, silicon often forms compounds in the +4 oxidation state, though many unusual compounds have been discovered that differ from expectations based on its valence electrons, including the silicides and some silanes.