Mr. Ralphs, TYPE OF ROCKS

Conglomerate

Sedimentary- You will see different colored, rounded pebbles cemented together. Used to make concrete.

Obsidian

Igneous- Lava cools very quickly, it can harden into glassy, black rock.

Granite

Igneous- Used in building and monuments. It is made of mineral crystals. Forms in the Earths surface from Magma. It has small crystals. If it hardens slowly, the crystals are larger.

Peridotite

Igneous- dark green or black rock forms inside the earth's crust from magma. It contains a lot of iron.

Pumice

Igneous- forms form lava, gas bubbles are trapped inside. Rock looks spongy.

Gabbro

Igneous- forms from magma inside the Earth's crust. Dark green, dark grey, brown, or black.

Tuff

Igneous- tiny bits of lava and ash that get shot out of a volcano can become stuck together. These particles cool and harden they make this rock. Pinkish tan color.

MICA SCHIST

Metamorphic rock- can form from shale, It can split into thinner layers

Quartzite

Metamorphic- Sandstone under a lot of pressure deep inside the Earth will change to this rock. Grayish tan color.

Granite Gneiss

Metamorphic- Under high heat and pressure, forms from granite. has bands twist or curve showing how the rock was melted.

Marble

Metamorphic- heat from magma inside the Earth's surface can change limestone into this rock. Pure forms of this rock is white, but minerals in this rock can color it pink, green, yellow, or black.

Slate

Metamorphic- high pressure can change shale to this rock. Often used for chalkboards, roof tiles, and patio stones. This Rock is dark blue-gray.

Migmatitek

Metamorphic- is formed from combination of rocks that have been melted by intense heat. Swirling patterns are created.

Hornfels

Metamorphic- it comes from slate. Looks shiny, dark-brown horn.

Feldspar

Mineral- crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock.

Hornblende

Mineral- is a field and classroom name used for a group of dark-colored amphibole minerals found in many types of igneous and metamorphic rocks.

Biotite

Mineral- is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks

Quartz

Mineral- is also the most varied of all minerals, occurring in all different forms, habits, and colors. There are more variety names given to this mineral than any other mineral. -

Calcite

Mineral- is the one of the most common minerals on earth. It occurs in a seemingly unlimited variety of shapes and colors. It constitutes a major portion of many of the earth's rocks. -

Coal

Sedimentary- Shiny black, isn't formed from pebbles or sand. It's made of dead plants. Heat and pressure turn the dead plants into this rock millions of years ago.

Limestone

Sedimentary- It's a mineral calcite. Sea creatures take calcite from seawater and use it to make their shells. After the creatures die, their shells sink and may become cemented into gray rock.

Breccia

Sedimentary- is made up of multicolored rock chips cemented together. Forms from piles of broken rocks at the bottoms of cliffs.

Shale

Sedimentary- made up of layers of silt and clay. Split apart easily. Used to make bricks.