Rocks and Landforms Research Project

Igneous Rocks:

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 Rocks:

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:

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.