Onakite
What is onyx, its gemological characteristics
Onyx, its properties and uses Onyx is a type of white and black opal (cryptocrystalline quartz or chalcedony) This stone should not be confused with marble onyx, which is a limestone Onyx texture is parallel and homogeneous Some types of onyx, such as Sard onyx with a brown base and white top surface, carnelian onyx…
What is oligoclase stone | Oligoclase detection methods
Oligoclase (in English: Oligoclase) With the chemical formula (NaCa) [Al 1-2 Si 3-2 O8], it is a mineral group and is derived from the word oligos. Color the flame green – insoluble in acids Various mixtures of albite to anorthite In terms of crystal shape: prismatic – disc-shaped – macle Color: black – black gray…
Recognition of Oclaz stone – Laboratory of Gemology
Identification of oklase stone and its use Euclase (in English: Euclase) with the chemical formula AlBe[OH-SiO4] is a group of minerals and has full violet luminescence. It is derived from the word classus. Euclase is a rare beryllium aluminum hydroxide silicate mineral that crystallizes in the monoclinic system. It has the chemical composition of BeAlSiO4(OH)….
