Gneiss is a foliated metamorphic rock that has a

Gneiss is a foliated metamorphic rock that has a banded appearance and is made up of
granular mineral grains. It typically contains abundant quartz or feldspar minerals
Carbonate rocks: limestones, dolomites, marble
- Carbonate rocks are a class of sedimentary rocks composed primarily of carbonate
minerals. The two major types are limestone, which is composed
of calcite or aragonite and dolostone, which is composed of the mineral dolomite
What is limestone?
- Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO
3
) in
the form of the mineral calcite . It most commonly forms in clear, warm, shallow marine
waters. It is usually an organic sedimentary rock that forms from the accumulation of
shell, coral, algal, and fecal debris. It can also be a chemical sedimentary rock formed by
the precipitation of calcium carbonate from lake or ocean water

Why is limestone important?
What is dolomite?
Why is dolomites important?
What is marble?
Why is marble important?