Mineraloids are not true minerals as they lack crystalline structures. They do not have a perfect formula and are inorganic naturally forming solid without the cleavage property. Abmer, Jet, Obsidian, Pearl and Pumice are some of the good examples of mineraloids. They are formed after the rapid solidification from a melt, where the constituents fail to develop an ordered atomic structure. They are formed by volcanic traits, Obsidian, for example is a randomly formed network of volcanic glass.
Mineraloids can be even from the galaxy of stars. Tektites and Moldavites are some among the outer space materials to the earth formed as a result of an asteroid or comet. They collide with Earth at very high velocity generating a large mass of energy. The explosion melts the rock into a stream of molten material, extending the molten to wide landscapes. As the temperature falls, it solidifies quickly and gives out amorphous pieces.
The Libyan Desert glass is believed to be yellow, is originated from a desert environment due to the lighting. Enormous spaces of deserts were flash melted with lightning strikes and they rapidly congeal as amorphous silica producing glassy textures. The Moldavites are also from the flash-heat phenomena and are found in the Eastern Europe. They amuse the geo-travellers and collectors with its beautiful green colour, and the clear stones can be modified as a gem.
Organic mineraloids like Amber, found on sedimentary rock clusters, is actually the fossil plant resin. Another gem is the Jet, which is the rare black coal has a polished bright texture and are often cut into gemstones. The geologists are still searching for the evidence for Radiolarians and diatoms to be considered under mineraloids or not. The teeny-weeny creatures having thin amorphous shells sinks under the grounds cumulates to form sediments called ooze which eventually results in these organic solids.
Mineraloid environments are created beneath the earth’s surface where temperature and pressure are low. Materials like chrysocolla, limonite and opal freeze from gels and moulds to form minerals at favourable heat and temperature zones in the long run. Water and Mercury are also categorised as a natural inorganic substance which on modification changes to water ice and supercooled mercury.
Read More: The Journey To Collect Minerals