Euhedral crystals are those that are well-formed, with sharp, easily recognised faces. The opposite is anhedral: a rock with an anhedral texture is composed of mineral grains that have no well-formed crystal faces or cross-section shape in thin section.

What is euhedral in geology?

euhedral (idiomorphic) A morphological term referring to grains in igneous rocks which have a regular crystallographic shape. Euhedral forms are developed when a crystal grows freely in a melt and is uninhibited by the presence of any surrounding crystals.

What is euhedral Subhedral and anhedral?

Euhedral minerals show perfect or nearly perfect crystal faces. Subhedral minerals are rounded but still show the general characteristic shape of that mineral. Anhedral crystals are completely irregular in shape and do not resemble the characteristic form for that mineral.