Rocks and Landforms Research Project
An igneous rock is produced under conditions involving intense heat, as rocks of volcanic origin or rocks crystallized from molten magma.
1.) Granite: The streak of granite is white, and it has a metallic luster. It is a 6-7 on the Mohs hardness scale.
2.) Obsidian: The streak of obsidian is white, and it has a vitreous luster. It is a 5-6 on the Mohs hardness scale.
3.) Diorite: The streak of diorite is white, and it has a metallic or bronzy luster.
4.) Andesite: The streak of andesite is dark gray, and it has a metallic luster.
5.) Basalt: The streak of basalt is black, and it is dark colored and fine-grained.
Metamorphic rock is rock that was once one form of rock but has changed to another under the influence of heat, pressure, or some other agent without passing through a liquid phase.
1.) Slate: Slate is gray, and it's surfaces can range from shiny to dull, cross fractures are typically dull.
2.) Marble: The streak of marble is white or colorless, and it has a pearly to vitreous luster. Marble has a hardness of 3-4.
3.) Phyllite: The color of Phyllite is usually a black or gray, and it has a silky luster.
4.) Quartzite: The color of quartzite is usually white to gray, and it has a glassy luster. Quartzite is a 7 on the Mohs hardness scale.
5.) Serpentine: The streak of serpentine is white, and it has a greasy, waxy, or silky luster. Serpentine is a 2.5-5.5 on the Mohs hardness scale.
Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water.
1.) Shale: Most shale is black, but it can also be brown, red, or green. It breaks in thin sub-parallel layers, and is very brittle. Shale has a slightly grainy to gritty texture. Shale is a clastic, sedimentary rock.
2.) Sandstone: The color of sandstone is a tan or light brown color, and it has a dull to sub-vitreous luster. Sandstone is a 6.5-7 on the Mohs hardness scale. Sandstone is a clastic, sedimentary rock.
3.) Halite: The streak of halite is white, and it has a vitreous luster. Halite is a 2.5 on the Mohs hardness scale.Halite is a chemical, sedimentary rock.
4.) Coal:The streak of coal is black, and it has a dull or shiny luster. Coal is a 2-2.5 on the Mohs hardness scale. Coal is an organic, sedimentary rock.
5.) Limestone: The color of limestone is a white, tan, or grey. It is a 3-4 on the Mohs hardness scale. Limestone is an organic, sedimentary rock.