Phonolite is an uncommon shallow intrusive or extrusive rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic (fine-grained) to porphyritic (mixed fine- and coarse-grained).

Phonolite, any member of a group of extrusive igneous rocks (lavas) that are rich in nepheline and potash feldspar. The typical phonolite is a fine-grained, compact igneous rock that splits into thin, tough plates which make a ringing sound when struck by a hammer, hence the rock’s name.

Nov 20, 2023 · Phonolite is a type of volcanic rock that belongs to the family of igneous rocks. It is characterized by its unique mineral composition and texture, which set it apart from other volcanic rocks. The name "phonolite" is derived from the Greek words "phōnē," meaning sound, and "lithos," meaning stone, highlighting one of its distinctive features.

11 photos of Phonolite associated with Aegirine: NaFe 3+ Si 2 O 6: 8 photos of Phonolite associated with Tuperssuatsiaite: Fe 3+ Fe 3+ 2 (Na ) 2 Si 8 O 20 (OH) 2 (H 2 O) 4 · 2H 2 O: 5 photos of Phonolite associated with Nepheline: Na 3 K(Al 4 Si 4 O 16) 5 photos of Phonolite associated with Melanite: 5 photos of Phonolite associated with ...

Phonolite is a subvolcanic rock variety characterized by the presence of variable amounts of pyroxene and phenocrysts of sanidine, nepheline, diopside, nosean, kaersutite, and titanite, embedded in a groundmass of mainly nepheline and sanidine microlites.

Jun 2, 2017 · phonolite, any member of a group of extrusive igneous rocks (lavas) that are rich in nepheline and potash feldspar. The typical phonolite is a fine-grained, compact igneous rock that splits into thin, tough plates which make a ringing sound …

The common feldspathoid is nepheline (implied when the term “phonolite” is used unqualified), but leucite, nosean, haüyne, sodalite or analcime may be present and may be the only feldspathoid; melilite may be present.

Phonolite is an uncommon shallow intrusive or extrusive rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic (fine-grained) to porphyritic (mixed fine- and coarse-grained).

Phonolite is an uncommon extrusive igneous rock volcanic rock of intermediate chemical composition between felsic and mafic. Phonolite is available in brown, buff, cream, green, grey, pink, white colors.

Phonolite is a rare igneous, volcanic (extrusive) rock of intermediate composition, with aphanitic to porphyritic texture. Phonolite is unusual in that it forms from a highly silica undersaturated melt by low degrees of partial melting (less than 10%) of highly aluminous lower crustal rocks such as tonalite, monzonite and metamorphic rocks.