A textural description of igneous or metamorphic rocks in which the individual grains or crystals are of approximately equal dimensions. This uniformity indicates that the magma cooled at a steady, consistent rate, allowing all minerals to crystallize simultaneously. It contrasts with porphyritic textures, where large crystals sit in a matrix of much smaller ones.
Heard on the job
The face consists of an equigranular granite, making it highly predictable for our blast hole spacing.
Do not mix it up with
- Subequigranular: Equigranular means all grains are roughly equal in size, while subequigranular means there is a noticeable but minor variation in grain sizes.