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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.
Not all marine organisms do live near the surface of the ocean, but those marine organisms that are producers (those that photosynthesise) do and they do so because to photosy â¦ nthesise they need to live in the surface layers where sunlight can penetrate because at depth the oceans are dark.ater is the most important part in an living organism. our body is made up of 70% water and it helps the blood flow regular to our body parts. Every cell in the human body â¦ needs water because many of the body's processes, including chemical reactions, take place in water.