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Syenite
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Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in relatively small concentrations.
Syenite
Syenite from Corsica
Syenite from Corsica
Leucocratic variety of nepheline syenite from Sweden (särnaite)
Leucocratic variety of nepheline syenite from Sweden (särnaite)
Boulders of syenite near Concord, North Carolina, c. 1910
Boulders of syenite near Concord, North Carolina, c. 1910
Amphibole
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Amphibole is a group of inosilicate minerals, forming prism or needlelike crystals, composed of double chain SiO4 tetrahedra, linked at the vertices and generally containing ions of iron and/or magnes
Amphibole (tremolite)
Amphibole (tremolite)
Photomicrographs of a thin section containing an amphibole crystal; under cross-polarized light on the left, and plane-polarized light on the right.
Photomicrographs of a thin section containing an amphibole crystal; under cross-polarized light on the left, and plane-polarized light on the right.
Double-chain inosilicate structure looking up the [100] axis. Silicon ions are hidden by apical oxygen ions.
Double-chain inosilicate structure looking up the [100] axis. Silicon ions are hidden by apical oxygen ions.
Side view (along [010]) of double chain inosilicate backbone. Apical oxygens are at the bottom.
Side view (along [010]) of double chain inosilicate backbone. Apical oxygens are at the bottom.