A mineraloid is a mineral-like substance that does not demonstrate crystallinity. A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific Crystallinity refers to the degree of structural order in a Solid. Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals. For example, obsidian is an amorphous glass and not a crystal. Obsidian is a naturally occurring Glass formed as an extrusive Igneous rock. An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are Glass in the common sense refers to a Hard, Brittle, transparent Solid, such as that used for Windows many In Materials science, a crystal is a Solid in which the constituent Atoms Molecules or Ions are packed in a regularly ordered repeating Jet is derived from decaying wood under extreme pressure. Jet is a geological material and is considered to be a minor gemstone Opal is another mineraloid because of its non-crystal nature. OPAL ( Open Pool Australian Lightwater reactor) is a 20 megawatt pool-type nuclear research reactor that was officially opened in April 2007 Pearls, considered by some to be a mineral because of the presence of calcium carbonate crystals within their structure, would be better considered a mineraloid because the crystals are bonded by an organic material and there is no definite proportion of the components. A pearl is a hard roundish object produced within the soft tissue (specifically the mantle) of a living shelled Mollusk.
Common Mineraloids
- Amber, organic, non-crystal structure. Amber is Fossil tree Resin, which is appreciated for its color and beauty
- Anthracite, a variety of coal, "hard coal. Anthracite ( Greek Ανθρακίτης literally "a type of coal" from Anthrax, coal is a hard compact variety of mineral Coal that has a high "
- Coal, organic, nonhomogeneous, and non-crystal structure.
- Jet, not considered a true mineral due to organic, non-crystal nature, a mineraloid. Jet is a geological material and is considered to be a minor gemstone
- Lignite, a variety of coal, "Brown coal. Lignite, often referred to as brown coal, or Rosebud coal by Northern Pacific Railroad, is a soft brown fuel with characteristics that put it somewhere "
- Limonite, amorphous hydrated iron oxide, a mineraloid. Limonite is an ore consisting in a mixture of hydrated Iron(III oxide-hydroxide of varying composition
- Obsidian, volcanic glass - non-crystal structure. Obsidian is a naturally occurring Glass formed as an extrusive Igneous rock.
- Opal, non-crystal structure, a mineraloid. OPAL ( Open Pool Australian Lightwater reactor) is a 20 megawatt pool-type nuclear research reactor that was officially opened in April 2007
- Pearl, often considered a mineral due to crystal components, but then not a mineral due to organic origin, probably should be a mineraloid. A pearl is a hard roundish object produced within the soft tissue (specifically the mantle) of a living shelled Mollusk.
- Petroleum, organic and liquid. Petroleum ( L petroleum, from Greek πετρέλαιον, lit
- pyrobitumen, organic, nonhomogeous, non-crystal structure.
- Vulcanite, vulcanized natural or synthetic rubber, thus not a mineral due to organic composition, lack of crystal structure, and not naturally occurring. Vulcanization (or Vulcanisation refers to a specific curing process of Rubber involving high heat and the addition of Sulfur or other equivalent curatives
See also
- List of minerals Mineraloids are listed after minerals in each alphabetically sorted section. This is a List of Minerals for which there are Wikipedia articles
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