| A | B |
|---|
| micaschist | gold colored is a metaphoric rock that can form from shale.It can split into thinner layers than slate does.Metamorphic |
| slate | high pressure can change shale into slate. Slate is very hard and splits into flat sheets.That is why it is often used for chalkboards,rooftiles and patio stones.Usually dark blue gray.Metamorphic |
| hornfels | comes from slate that was heated by nearby magma. It means 'horn rock' in German. Hornfels looks like shiny,darkbrown horn. Metamorphic |
| Marble | Intense heat from magma inside Earth's crust or intense pressure can change limestone into marble. metamorphic |
| Quartzite | Metamorphic/sandstone deep inside the Earth can end up changing from quartzite. Most is more than 500 million years old. |
| Granite Gneiss | Metamorphic/Under high hear and pressur, granite gneiss forms from granite/generally speckled black-white and sometimes the bands twist or curve. |
| migmatite | is formed from a combination of rocks that have been melted by intense heat. When parts of the rocks melt and flow swirling patterns are created. It is usually part dark colored with lighter swirls. Metamorphic. |
| shale | sedimentary/made of layers of silt and clay. The green gray layers can be split apart easily.used to make bricks |
| breccia | sedimentary/made up of multicolored rock chips cemented together.often forms from broken rocks at the bottom of cliffs |
| sandstone | sedimentary/gritty feeling-because it is formed from grains of sand cemented together by hardened minerals. Orange sandstone is used for building. |
| chalk | sedimentary is a pure white form of limestone. |
| limestone | sedimentary/the lime in limestone is from the mineral calcite. Sea creatures take the calcite from seawater and use it to make their shells. After the creatures die their shells sink and may become cemented into grey limestone. |
| coal | sedimentary/made from dead plants. Heat and pressure turned the plants into coal millions of years ago. coal is burned to produce electricity. |
| conglomerate | sedimentary/you will see different colored rounded pebbles cemented toghether. It is used to make concrete |
| obsidian | igneous/when lava cools quickly it can harden into glassy black rock. Native American used this rock for arrowheads. |
| pumice | igneous/when this rock forms from lava gas bubbles are trapped inside. When the bubbles burst the rock is left looking SPONGY. this rock can be so light it floats on water. It is a light gray color. |
| gabbro | igneous/this rock forms from magma inside the Earth's crust. it may take the magma thougsands of years before it cools and hardens into this rock. usually dark green-brown or black. |
| basalt | igneous/lava cools it hardens into this rock. This common rock covers thousands of square miles of Earth's surface. Iceland is mostly made of this rock. |
| granite | igneous/tough hard rock that is used in building and monuments. t is make of mineral cru=ystals/white quartz pink feldspar and black mica. This rock hardens from the Earth's crust magma. |
| Tuff | igneous/tiny bits of lava and ash that get shot out of a volcan can become stuck together. When these particles cool and harden they make tuff. |
| peridotite | igneous/this dark green or black rock forms inside the Erth's crust from magma. It contains a lot of iron. In South Africa diamonds have been found in this type of rock |
