A group of silicate minerals consisting of rings of linked SiO4 tetrahedra having an Si:O ratio of 1:3.
| Structure | Mineral | Formula |
| Si3O9 | benitoite | BaTiSi3O9 |
| Si4O12 | axinite | (Ca,Fe+2,Mn)3Al2(BO3)(Si4O12)(OH) |
| Si6O18 | beryl | Be3Al2Si6O18 |
| cordierite | (Mg,Fe)2Al4Si5O
 H2O |
|
| tourmaline | (Na,Ca)(Li,Mg,Al)(Al,Fe,Mn)6(BO3)3(Si6O18)(OH)4 |
回复Comments
{commenttime}{commentauthor}
{CommentUrl}
{commentcontent}