What is Ophitic texture?
Consequently, what is Poikilitic texture?
Poikilitic texture refers to crystals, typically phenocrysts, in an igneous rock which contain small grains of other minerals. In igneous rocks Poikilitic texture is widely used to determine order of crystallization; if one mineral is enclosed by another then the enclosed grain must have been the first to crystallize.
Subsequently, question is, what is Panidiomorphic texture? Definition of hypidiomorphic texture. A texture of igneous rocks in which the greater proportion of the crystallized minerals have subhedral forms.
Secondly, how do you describe the texture of a rock?
The texture of a rock is the size, shape, and arrangement of the grains (for sedimentary rocks) or crystals (for igneous and metamorphic rocks). Also of importance are the rock's extent of homogeneity (i.e., uniformity of composition throughout) and the degree of isotropy.
What is the texture of pegmatite?
A pegmatitic texture is one in which the mineral grains are exceptionally large. The largest ones are, by convention, more than about 3 cm long. This texture is found in intrusive rocks. Instead, the large crystals of a pegmatite formed in a magma that was extra rich in dissolved water.