Basanite is an aphanitic (fine-grained) igneous rock that is low in silica and enriched in alkali metals. Of its total content of quartz, feldspar, and feldspathoid (QAPF), between 10% and 60% by volume is feldspathoid and over 90% of the feldspar is plagioclase. Quartz is never present.

Basanite, extrusive igneous rock that contains calcium-rich plagioclase feldspar (usually labradorite or bytownite), feldspathoid (usually nepheline or leucite), olivine, and pyroxene (titanaugite). Basanite grades into tephrite, which contains no olivine.

Sep 22, 2023 · Basanite is a silica-poor, fine-grained, dark-colored volcanic rock. Here is its appearance, composition, formation, and where it is found.

Not to be confused with bassanite, the mineral, or basanite (chert), the black chert. Basanite appears in field 14 in the QAPF diagram. A family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...

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A basaltic extrusive rock closely allied to chert, jasper, or flint. Also known as Lydian stone; lydite.

The main rock types are silica-undersaturated lava, alkalic basalt, basanite, and melanephenelinite, with lesser amounts of nephelinite, trachyte, and phonolite. Intrusive equivalents occur as alkali gabbro, theralite, and ijolite.

Black Jasper, also known as Basanite, is a deep, velvety black amorphous quartz. Basanite, Lydian stone and radiolarite are all used for various dense, fine grained black rocks with a flinty or cherty texture. The “Lydian Stone” was known to the ancient Greeks and gets its name from Lydia, an ancient kingdom in what is now western Turkey.

Jan 11, 2007 · Basanite is an extrusive igneous rock that contains calcium-rich plagioclase feldspar (usually labradorite or bytownite), feldspathoid (usually nepheline or leucite), olivine, and pyroxene (titanaugite).

Nepheline-basanite. Mafic (dark) igneous rock with aphanitic matrix and phenocrysts of green olivine and black pyroxene. Collection of Department of Geology, Faculty of Science, Palacký University in Olomouc, Czech Republic.