Rocks and mineralsOnline version True or false? by Lydia García Marina 1 Fossils and coal are minerals. a True b False 2 Rocks are clusters of minerals and other inorganic materials. a True b False 3 Minerals are structured crystals that have specific chemical components. a True b False 4 Examples of igneous rocks are chalk and basalt. a True b False 5 Diamonds form when molten lava from volcanoes cools down. a True b False