Taaffeite
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…
Onakite stone, specifications and application of onakite stone
What is Onakite Unakite is an igneous rock that is mainly composed of pink orthoclase feldspar, greenish-yellow epidote, gray or grayish quartz and small amounts of magnetite, chromite, ilmenite, apatite, zircon and other minerals Another name for this granite is epidote. Onakite stone is found from the fall of glaciers into the water and its…
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…
