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Calcite: calcite forms and is stable at the Earth's surface. Some calcite is formed from precipitation, but much of the calcite in sedimentary rocks is formed by biological activity. Many marine organisms secrete skeletal material (shells) of calcite.In addition to these three most abundant minerals, some sedimentary rocks also contain the iron oxides hematite and limonite, and small amounts of feldspars and micas.any marine organisms secrete skeletal material (shells) of calcite. In addition to these three most abundant minerals, some sedimentary rocks also contain the iron oxides hematite and limonite, and small amounts of feldspars and micas.
Volcanic islands are formed of igneous rock and lava. They tend to be tall, and have steep slopes. Coral islands are calcium carbonate (chemically the same as limestone) and a â¦ re formed from the secretions of sea coral-an animal. They tend to be low to the water, and relatively flat.