Search results
Results from the WOW.Com Content Network
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.
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file
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] The characteristic features of kentbrooksite, that make it different from eudialyte are: (1) dominancy of fluorine (the only currently known example among the whole group [ 2 ] ), (2 ...
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]
A silicate mineral is generally an inorganic compound consisting of subunits with the formula [SiO 2+n] 2n−. Although depicted as such, the description of silicates as anions is a simplification. Balancing the charges of the silicate anions are metal cations, M x+. Typical cations are Mg 2+, Fe 2+, and Na +. The Si-O-M linkage between the ...
Abenakiite-(Ce) is a mineral of sodium, cerium, neodymium, lanthanum, praseodymium, thorium, samarium, oxygen, sulfur, carbon, phosphorus, and silicon with a chemical formula Na 26 Ce 6 (SiO 3) 6 (PO 4) 6 (CO 3) 6 (S 4+ O 2)O. The silicate groups may be given as the cyclic Si 6 O 18 grouping.
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]
The original formula was extended to show the presence of both the cyclic silicate groups and silicon at the M4 site, according to the nomenclature of the eudialyte group. [4] It is the third eudialyte-group mineral with essential tungsten (after khomyakovite and manganokhomyakovite ), and second with essential rare earth elements (after ...