Tetrahedral silicates {cyclosilicate} can be rings.
CuSiO2(OH)2 [2 is subscript] {dioptase} is copper cyclosilicate and is green.
Be3Al2Si6O18 [3, 2, 6, and 18 are subscripts] {beryl}| is aluminum cyclosilicate and can be hexagonal beryllium ore {pegmatite}, emerald, or aquamarine.
Beryl can be blue minerals {aquamarine, mineral}.
Beryl can be green minerals {emerald}|.
(Na,Ca)(Li,Mg,Fe,Al)3(Al,Fe)6B3Si6O27(O,OH,F)4 [3, 6, and 27 are subscripts] {tourmaline}| is aluminum and iron cyclosilicate and commonly is schorl.
Tourmaline commonly is a black mineral {schorl}.
5-Earth Science-Mineral-Kinds-Silicates
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Date Modified: 2022.0225