Igneous Textures

An intergrowth of albite or oligoclase with a microcline host, occasionally also with a orthoclase host. The intergrowths or exsolution lamellae of the albite are visible as white lines coursing through the K feldspar groundmass.
Common in granite pegmatites.

Having small crystals of one mineral scattered irregularly in larger crystals of another mineral.

Consisting entirely of crystals

Containing both glass and crystals

Consisting of all glass

Most minerals too fine grained to see with the naked eye

Coarse enough minerals to see with the naked eye

Very coarse grained

Grains of the same size vs varying in considerable size

Bimodal size distribution

Large crystal set in a fine matrix

Host mineral (mineral enclosing another) in a poikilitic rock

Commonly created by exsolution and devitrification and immiscibility processes in igneous rocks. It is called 'graphic' because the exsolved or devitrified minerals form wriggly lines and shapes which are reminiscent of writing.