They are rocks with a small grain size.
Fine textured rocks have a fine-grained or aphanitic texture, meaning that their mineral crystals are too small to be visible to the naked eye. This texture forms when the rock cools quickly, preventing large mineral crystals from growing. Fine-grained rocks often have a smooth, uniform appearance.
Yes m that it true, other than glasses all rocks have grains.
large grains
Rocks with a large grain size perhaps with angular grain shapes.
Glassy textured extrusive igneous rock, such as obsidian.
Rough-textured rocks have distinct grains that are visible to the naked eye. These grains are typically made up of mineral crystals or fragments that give the rock its rough texture. The size, shape, and arrangement of grains can provide important clues about the rock's formation and history.
Firm-textured yarn.
Could be basalt, an extrusive igneous rock.
No. Fine textured hair is more suseptible to static than coarser hair, however, a higher percentage of blondes may have fine textured hair thanbrunettes
The dominant soil separate in fine textured soil is clay. Clay particles are smaller in size compared to silt and sand, giving fine textured soils their characteristic smooth texture and ability to hold water and nutrients.
Porphyry is actually a coarse-textured igneous rock in a mass of fine-grained igneous rocks, but in case you meant porphyria, it is a rare disease caused by heme, an important part of hemoglobin, not being created properly.
Coarse grained textured rocks (phaneritic) have very large crystals because the magma, from which they are created, cools very slowly. Fine grained rocks (aphaneritic) have small crystals because the lava, from which they are created, cools down very quickly.