Metamorphism RockGneissic Gneissic rock come from the Metamorphism rock. Metamorphism rock change the form. The changes are in the mineralogy, texture, and sometimes the chimical composition of rocks Metamorphism rocks takes place usually in elevates temperatures and pressures. This rocks gradually changes until state of equilibrium with the new enviroment. The Agents of metamorphims include heat, pressure, and chemically active fluids.
Gneissic Gneissic rock is common and widely distributed type of rock. The rocks with a banded appearence are call gneissic. Foliated gneissic will not usually split as easily as slates and some schists. This gneissic rock I found in Turlock. The place was in my way to Turlock near to highway
Gneissic I identify the rock for the texture because are a little dark biotite flakes and the light silicate minerals. Given the rock a banded or layered appearance. Gneissic is a foliated texture
Quartz The Changes on Metamorphism rocks increased the density, change in size, reorientation of mineral grains The transformation of low temperature minerals into high temperature minerals. Metamorphism rocks can be broadly classified in foliation exhibited and to lesser extend on the chemical composition. Quartz is a very hard metamorphism rock.
Quartz The quartz is a non foliated texture Fused quarts grains, massive, very hard We can find this type of rock in the water or near to it. The quarts are formed in sandstone. Quartz formed under moderate to high grade and the grains in sandstone fuse together. The quartz ridges are often bare or covered only with very thin layer of soil and a little vegetation.
I identify this rock because is near to the water in yosemite and this rock shows grainstypical of a quarts and this rocks are white to gray.
Sedimentary Rocks About 75 percent of the land areas are covered by sediments and sedimentary rocks. Across the ocean floor the earth solid surface, virtually everything is covered by sediment. This rocks are mostly located in mid ocean, water and at some volcanic areas. The particles of the sedimentary rocks by accumulating is call sediment.
Sedimentary Rocks The sediment are formed by weathering and erosion in a source area and then they are transported to the place of deposition by water, winds mass movement or glaciers This group of rock provides geologists with much of the basic information they need to reconstruct the details of Earth history.
Sandstone The name of this rock in which the sand size grain dominate Sandstone is the most abundant sedimentary rock, accounting for approximately 20 percent of the entire group. Sandstone form in a variety of environment and often contain significant clues about their origin. The shapes of the sand can also help decipher the history of sandstone. The sandstone also containing significant amount of feldspar and angular grain of the ferromagnesian minerals.
This sandstone is a sedimentary rock and I found it in Turlock Lake in the cold water
Igneous The igneous rocks are composed or interlocking crystals. Igneous form in two basics setting Magma and Crystallizes. When magna loses its mobility before reaching the surface it eventually crystallizes form in a igneous rocks. They also known as plutonic rocks. Igneous rock are abundant in western portions of the american like vocanic peak cascades and mountains .
Granite Rock This rocks dominated in minerals. The geologist also refers to granite rock as being felsic. Granitic rocks are rich in silica about 70 percent.
The granite is an igneous rock I found this in Yosemite mountains I identify this rock forthe texture.
Mafic Basaltic Rock Basalt is a very dark green to black. This rock is composed primarily of pyroxene and calcium. Basalt is the most common extrusive igneous rock. Many volcanic island and iceland are composed mainly of Basalt rocks/ I find that this rocks is a Basaltic for the color and texture and for the upper layers.