#andesite

• Aphanitic — Pertaining to or having the characteristics of an aphanite; a term used to describe the texture of igneous rocks whose crystalline components are of microscopic or submicroscopic dimensions, making them indistinguishable to the naked eye. This extremely fine structural arrangement indicates a rapid solidification of magma or lava at or near the Earth's surface, a process that prevented the growth of large crystals.
• Andesite — An effusive (volcanic) igneous rock with a microlitic or porphyritic texture, gray, brown, or greenish in color, mainly composed of plagioclase feldspar (such as andesine) and ferromagnesian minerals (amphiboles, pyroxenes, or biotite). It has a wide distribution in eruption areas and is intensely used in construction as dimension stone, paving, gravel, or structural aggregate due to its hardness.
• Andesite — An obsolete linguistic variant or synonymous regional form of the standard term 'andezit', historically used in some mining treatises or technical translations to describe the effusive volcanic rock with a microlitic texture. It represents a feminine morphological adaptation of the international petrographic name, abandoned in modern geological standards in favor of the neuter form.