Organic Minerals
Organic minerals represent one of the most unusual and fascinating corners of mineralogy: these are crystalline substances that carry organic life’s fingerprint in their chemistry—carbon-hydrogen or carbon-nitrogen bonds—yet are formed through geological or biological processes in nature. You’ll find them in places you don’t often associate with “minerals” — think of mineralised guano layers, fossil-plant rich sediments, hydrocarbon-laden veins or rare salts of organic acids like oxalates and formates. Because they originate at the interface of biology and geology, organic minerals can tell you stories about organic matter burial, fluid migration, alteration in unique environments and even pathways of carbon cycling over geological time. In this category you’ll learn how to recognise examples such as oxalates formed from decaying vegetation, hydrocarbons crystallised under special conditions, and other salts of organic acids; you’ll also understand why these minerals matter—not just for pure science, but for fields like geo-biology, environmental investigations, resource exploration and the broader story of Earth’s carbon system.
Coal
Coal is a non-clastic sedimentary rock. They are the fossilized remains of plants and are in flammable black and brownish-black tones. Its main element...
Amber
Amber is a fascinating organic gemstone that has captured human fascination for millennia. It's not a mineral, but rather a fossilized resin from ancient...
Pearl
A pearl is a hard, shiny object produced in living tissue such as a crustacean mollusk or fossil conulariids. It is generally composed of calcium carbonate and mainly aragonite.
Coral
Coral is skeletal material produced by marine animals. Coral is organic and created by living organisms. When coral polyps die, the hardened skeleton remains and this material is used as a gemstone. Most corals are white, but nature can create coral in many other colors, including the popular orange to red forms. Usually its compound is calcium carbonate.
