Triangular silicates {tektosilicate}, such as feldspar, can be three-dimensional structures. Tektosilicates are the most-common silicates.
feldspar and plagioclase mixture {andesite}.
CaAl2Si2O8 [2 and 8 are subscripts] {anorthite} is tektosilicate.
CaB2Si2O8 [2 and 8 are subscripts] {lazurite} {lapis lazuli}| is tektosilicate, is blue or dark blue, and is granular.
KAlSi3O8 [3 and 8 are subscripts] {orthoclase} is tektosilicate and is monoclinic.
NaAlSi3O8 [3 and 8 are subscripts] {plagioclase} is tektosilicate.
NaCa2Al5Si13O36 . 14 H2O [2, 5, 13, and 36 are subscripts] {stillbite} is tektosilicate and can be zeolite.
Stillbite can be aluminum silicate {zeolite} that swells under heat.
Triangular silicates {feldspathoid} {feldspar}| can be low in silicon. Feldspar is the most-common silicate.
Feldspar {moonstone}| can have pearl luster.
Fine-grained igneous rock has large feldspar crystals {porphyry}.
5-Earth Science-Mineral-Kinds-Silicates
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Date Modified: 2022.0225