Grain shape.
texture
texture
The texture thus described is referred to as aphanitic texture.
A rock with large crystals typically has a coarse texture. The large crystals are easily visible and may feel rough to the touch due to their size.
fined grain texture
Grain
Grain
Grain shape.
texture
Because of the gravity ..
It doesn't. The grain size effects the texture. If a rock has a small grain size, it will have a smooth texture. If the grain size is large, such as pebbles, the texture will be rough. For example, siltstone is one of the smoothest rocks because it contains silt particles, which are .0004cm to .006cm. Conglomerate though contains various particles including cobbles and boulders, which are from 10cm to 100cm.
Because of the gravity ..
These characteristics determine a rock's texture.
texture
Large crystals with a coarse crystal grain texture.
The size of the grains in a sedimentary rock can be determined by examining the texture of the rock. Coarser grains indicate a larger grain size, while finer grains indicate a smaller grain size. Other features that can provide clues to grain size include the sorting (uniformity of grain sizes) and rounding of the grains.