Granoblastic is an adjective describing an anhedral phaneritic equi-granular metamorphic rock texture. Granoblastic texture is typical of quartzite, marble, charnockites and other non-foliated metamorphic rocks without porphyroblasts. Characteristics defining granoblastic texture include: grains visible to the unaided eye, sutured boundaries, and approximately equidimensional grains. The grain boundaries intersect at 120° triple junctions under ideal conditions. Variation from the ideal results from stress produced foliation during crystallization resulting in schistose textures.

A rock that has a granoblastic texture can be termed a granofels.

• Dictionary of Mining, Mineral, and Related Terms
• Metamorphic Microstructures

This metamorphic rock-related article is a stub. You can help Wikipedia by expanding it.

• v
• t
• e