Analysis of texture can yield information about the rock’s source material, conditions and environment of deposition (for sedimentary rock) or crystallization and recrystallization (for igneous and metamorphic rock, respectively), and subsequent geologic history and change.
The term rock refers to the bulk volume of the material, including the grains or crystals as well as the contained void space.
Rocks are commonly divided into three major classes according to the processes that resulted in their formation.
These classes are (1) igneous rocks, which have solidified from molten material called magma; (2) sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions; and (3) metamorphic rocks, which have been derived from either igneous or sedimentary rocks under conditions that caused changes in mineralogical composition, texture, and internal structure.
The changes can be chemical (compositional) and physical (textural) in character.
Metamorphic rocks are often formed by processes deep within the Earth that produce new minerals, textures, and crystal structures.
The conversion of sediment to rock is termed Rocks have many different textures.
About a third of people with JME may show a photoparoxysmal response or an abnormal EEG in response to flickering lights.
Therefore, if a normal EEG is obtained from someone suspected of having juvenile myoclonic epilepsy, than it is important to perform an EEG capturing sleep and wakefulness to make certain of the diagnosis.
I had a couple of grand mal seizures and was put on medication for a few years.
Because I didn't have any more seizures, the drugs were stopped.