Igneous texture final.

1. Igneous rock textures are determined by the cooling rate of molten rock material. Rapid cooling results in small crystal size or glassy texture, while slow cooling allows larger crystals to form. 2. Textures include phaneritic (visible crystals), holocrystalline (well-developed crystals), porphyritic (large and small crystals), and trachytic (aligned plagioclase crystals indicating lava flow). 3. Features like crystal size, shape, and mutual grain relationships are used to classify textures as equigranular, inequigranular, intergranular, and others which provide information about the cooling and crystallization history.