Crystal size in igneous rocks is controlled by the rate of cooling whereby the slower the rate, the larger the size of crystal.
there is no visible grain size
Small to medium grain size.
Particle size is another name for the term grain size.
Slaet in grain size is the size of sand crystals.
Neither. It has no visible grain.
Basalt's grain size is considered to be super-fine and very smooth.
Grain size increases in the process of recrystallization.
The grain size of sand is 1/16 mm to 2 mm, which is gritty and visible grain.
1.Grain Size 2.Grain Shape 3.Grain Pattern
It is as big as the size of one grain of rice.
Well chalk's grain size can vary on the materials used. It is around 3mm-6mm