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This is a list of substances or materials generally considered discredited. A substance can be discredited in one of three ways: It was widely believed to exist at one time but no longer is. Such substances are often part of an obsolete scientific theory. It was once believed to have drastically different properties from those accepted now.
Use of old mineral names is also discontinued, for example when a name is no longer considered valid. Therefore, a list of recognised mineral species is never complete. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species.
Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety. Mineral variety names are listed after the valid minerals for each letter.
Glastron V-142 Skilifte motor boat in Forum Marinum maritime museum. Glastron is a boat manufacturing company and was one of the first manufacturers of fiberglass boats. Glastron is owned by Rec Boat Holdings, a subsidiary of Groupe Beneteau. Bob Hammond, Bill Gaston, Bob Shoop, and Guy Woodard founded the company on October 14, 1956, in Austin ...
In the United States and Canada, "styrofoam" is often used as a generic term for disposable foam cups, plates, coolers and packing material, although these are made from a different polystyrene product than true Styrofoam Brand Foam, [211] which is made for thermal insulation and craft applications. [212] Tannoy: Public-address (PA) system ...
A material derived from alien Protomolecule, used as hull protective plating for ships. The Rocinante was one such ship upgraded to use the material, whilst other ships were constructed with it as an original part of the hull. The material itself contains no protomolecule, having been developed by simply observing the molecular structure. Cargonite
Choosing the right material, then, means balancing style with durability—it needs to look good, but it also has to be able to withstand scratches, stains, heat, and the chaos of daily life.
A rock may consist of one type of mineral or may be an aggregate of two or more different types of minerals, spacially segregated into distinct phases. Some natural solid substances without a definite crystalline structure, such as opal or obsidian, are more properly called mineraloids. If a chemical compound occurs naturally with different ...