chip="mw-headline" id="Mineral_identification" >Mineralkennzeichnung>>
Minerypyrope is a member of the Shell Group. Pyrop is the only member of the pomegranate line that always shows a reddish colour in nature, and it takes its name from this characteristic: from Greek for fire and eyes. Although less widespread than most grenades, it is a widespread gem with many alternate designations, some of which are misnamed.
Chromium pyrope and Czech garnets are two alternate denominations whose use is dispirited by the Gemological Institute of America. 2 ] Misnomer are Colorado Ruby, Arizona Ruby, California Ruby, Rocky Mountain Ruby, Elie Ruby, Boohemian and Cape Ruby. Pyrope is Mg3Al2(SiO4)3, although there are other typical components in at least small amounts - these other components are Ca, Cr, Fe and Mn.
Together with alandandine and spessartin, pyrope constitutes a fixed range of solutions, which together are known as pyralspit shell (pyrope, almandin, spessartine). The pyrostructure contains less ferrous and less ferrous material than magnesia. As a result, the resulting composite grenades are determined by their pyrope-almandine ratios. Semiprecious Rhodolith is a gemstone made of ~70% pyrope comp.
Most pyrope originates in ultramafish rock, usually in the earth's mantle: these pyidotites originating from the earth's surface can be traced back to both magmatic and metamorphous reactions. Pyrop also exists in ultra-high compression metamorphous rock (UHP), as in the Dora Maira Massiv in the West Alps. This massive contains almost purely pyrope in almost 12 cm thick crystal; some of these pyrope have pockets of Coesit, others of Enstatit and Saphirin.
Pyrop is customary in kimberlit piping based persidotite xenolites, some of which contain diamonds. Micropyrope in combination with diamonds usually has a Cr2O3 concentration of 3-8%, which gives a distinct purplish to dark purplish colour (often with a green hue ) and is therefore often used as a kimberlit indication in areas where the source of the tube is hampered by aerosol erosion.
They are called chromium pyrope or G9/G10 garnet. It is very difficult to tell the difference between pyrope and alandandine in the palm, but it is likely to have fewer defects and include. Caution is required when using these characteristics, as many of the characteristics mentioned have been derived from synthetic, purely pyrope.
Others, such as the pyrope's high density, may be of little use when examining a small crystalline material encapsulated in a matrices of other silica ores. If this is the case, the best evidence that the shell you are learning is a pyrope may be the combination with other magical and ultramorphic materials. The most characteristic characteristics of pyrope in thin section petrography are those of other commonly used garnets: high reliefs and isotropics.
In thin section, shells have a tendency to be less colored than other silica materials, although pyrope may have a bright pink-purple color in plane-parallel sunlight. Deficiency of fission, often euhetral crystalline mortology and inorganic connotations should also be used in the microscopic detection of pyropene.