Mineraloid
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Mineraloids Group
A "mineraloid" is a mineral-like substance that does not demonstrate crystallinity and who's chemical composition is beyond the accepted ranges for specific minerals.
Mineraloid
A mineral-like substance that does not have a crystal structure and possesses a chemical composition that varies beyond the accepted range for a specific mineral.
Mineraloids
A small set of substances that are amorphous (never form crystals).
Minerals with Metallic Luster ...
mineraloid (n) a mineral-like structure which is not crystallised. Non-crystallised (i.e., mineraloid) gemstones include obsidian, jet and opal.
It is considered a mineraloid, rather than a full mineral, because its structure is not truly crystalline. This stone has the same chemical composition as quartz, but contains up to 13% water.
Isotropic includes amorphous mineraloids and minerals in the isometric crystal system. Light entering isotropic gems moves in all directions with equal velocity, creating only one index of refraction.
The main occurrences of this mineral or mineraloid are in the mines where copper deposits are in abundance. Israel, Congo, Chili, Zaire, Australia, U.S.A, France are the regions where the mineral is widely found.
Chyrsocolla is a hydrous silicate of copper, occurring massive, of a blue or greenish blue color and is more appropriately a mineraloid than a true mineral. Chrysocolla is another one of Copper's crystal offspring.
mineraloid A naturally occurring, usually inorganic, solid consisting of either a single element or a compound, and having a definite chemical composition but lacking a systemic internal arrangement of atoms. Opal and Obsidian are two examples.
 See also: Mineral, Minerals, Crystal, Stone, Natural
  
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