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Organic oil is also produced by plants, animals, and other organisms through organic processes, and these oils are remarkable in their diversity. Oil is a somewhat vague term in chemistry; instead, the scientific term for oils, fats, waxes, cholesterol, and other oily substances found in living things and their secretions, are lipids.
Lipids, ranging from waxes to steroids, are somewhat hard to characterise, and are united in a group almost solely based on the fact that they all repel, or refuse to dissolve in, water, and are however comfortably miscible in other liquid lipids. They also have a high carbon and hydrogen content, and are considerably lacking in oxygen compared to other organic compounds and minerals.
• Mineral oil
Mineral oils, found in porous rocks underground, originated from organic material, such as dead plankton, accumulated on the seafloor in geologically ancient times. Through various geochemical processes this material was converted to mineral oil, or petroleum, and such. These are classified as mineral oils because they do not have an organic origin on human timescales, and are instead derived from underground geologic locations such as in rocks, underground traps, or sands.