How to distinguish granite, gneiss and sandstone
Belong to the fire Shenyang variable three main types, from the appearance of a simple distinction about it.Granite: the main mineral composition of feldspar, quartz and mica, feldspar, mica quartz hypautomorphic, its shape, mineral distribution uniform, mineral orientation is not strong, sometimes seen with feldspar phenocrysts rough. Different areas or periods of granite mineral particle size is larger. The formation of acidic magma cooling.
Is a sandstone sedimentary rocks, with bedding. Minerals are dominated by quartz, quartz visible granular grinding Park phenomenon, intergranular clayey and iron mud, such as siliceous cementation, mica is light colored pieces, generally less content, and to focus on the trend level. Sometimes in the sandstone are visible different rock components, such as gravel. Well rounded gravel content many transition conglomerate.
Similar components and granite, gneiss, mica or other colored minerals are usually not smooth (banded or layered) distribution, and the formation of feldspar augen produced in the zone, a strong directional mineral, this is a typical "gneissic structure. As the depth of metamorphic rocks.
