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- Pyrope abstract "This article is about the mineral. For the bird sometimes placed in the monotypic genus Pyrope, see fire-eyed diucon.The mineral pyrope is a member of the garnet group. Pyrope is the only member of the garnet family to always display red colouration in natural samples, and it is from this characteristic that it gets its name: from the Greek for fire and eye. Despite being less common than most garnets, it is a widely used gemstone with numerous alternative names, some of which are misnomers. Chrome pyrope, and Bohemian garnet are two alternative names, the usage of the latter being discouraged by the Gemological Institute of America. Misnomers include Colorado ruby, Arizona ruby, California ruby, Rocky Mountain ruby, Elie Ruby, Bohemian carbuncle, and Cape ruby.The composition of pure pyrope is Mg3Al2(SiO4)3, although typically other elements are present in at least minor proportions—these other elements include Ca, Cr, Fe and Mn. Pyrope forms a solid solution series with almandine and spessartine, which are collectively known as the pyralspite garnets (pyrope, almandine, spessartine). Iron and manganese substitute for the magnesium in the pyrope structure. The resultant, mixed composition garnets are defined according to their pyrope-almandine ratio. The semi-precious stone rhodolite is a garnet of ~70% pyrope composition.The origin of most pyrope is in ultramafic rocks, typically peridotite from the Earth's mantle: these mantle-derived peridotites can be attributed both to igneous and metamorphic processes. Pyrope also occurs in ultrahigh-pressure (UHP) metamorphic rocks, as in the Dora-Maira massif in the western Alps. In that massif, nearly pure pyrope occurs in crystals to almost 12 cm in diameter; some of that pyrope has inclusions of coesite, and some has inclusions of enstatite and sapphirine.Pyrope is common in peridotite xenoliths from kimberlite pipes, some of which are diamond-bearing. Pyrope found in association with diamond commonly has a Cr2O3 content of 3-8%, which imparts a distinctive violet to deep purple colouration (often with a greenish tinge) and because of this is often used as a kimberlite indicator mineral in areas where erosive activity makes pin pointing the origin of the pipe difficult. These varieties are known as chrome-pyrope, or G9/G10 garnets.".
- Pyrope colour Chromium.
- Pyrope thumbnail Pyrope.jpg?width=300.
- Pyrope wikiPageID "1658527".
- Pyrope wikiPageLength "6419".
- Pyrope wikiPageOutDegree "51".
- Pyrope wikiPageRevisionID "634648486".
- Pyrope wikiPageWikiLink Almandine.
- Pyrope wikiPageWikiLink Biotite.
- Pyrope wikiPageWikiLink Calcium.
- Pyrope wikiPageWikiLink Category:Aluminium_minerals.
- Pyrope wikiPageWikiLink Category:Garnet_group.
- Pyrope wikiPageWikiLink Category:Magnesium_minerals.
- Pyrope wikiPageWikiLink Chromium.
- Pyrope wikiPageWikiLink Coesite.
- Pyrope wikiPageWikiLink Conchoidal_fracture.
- Pyrope wikiPageWikiLink Cubic_crystal_system.
- Pyrope wikiPageWikiLink Diamond.
- Pyrope wikiPageWikiLink Diamond_cut.
- Pyrope wikiPageWikiLink Earths_mantle.
- Pyrope wikiPageWikiLink Emerald_cut.
- Pyrope wikiPageWikiLink Enstatite.
- Pyrope wikiPageWikiLink Euhedral.
- Pyrope wikiPageWikiLink Euhedral_and_anhedral.
- Pyrope wikiPageWikiLink Fire-eyed_diucon.
- Pyrope wikiPageWikiLink Garnet.
- Pyrope wikiPageWikiLink Gemological_Institute_of_America.
- Pyrope wikiPageWikiLink Gemstone.
- Pyrope wikiPageWikiLink Hornblende.
- Pyrope wikiPageWikiLink Hydrofluoric_acid.
- Pyrope wikiPageWikiLink Igneous.
- Pyrope wikiPageWikiLink Igneous_rock.
- Pyrope wikiPageWikiLink Iron.
- Pyrope wikiPageWikiLink Isotropy.
- Pyrope wikiPageWikiLink Kimberlite.
- Pyrope wikiPageWikiLink Mafic.
- Pyrope wikiPageWikiLink Manganese.
- Pyrope wikiPageWikiLink Mantle_(geology).
- Pyrope wikiPageWikiLink Metamorphic_rock.
- Pyrope wikiPageWikiLink Misnomer.
- Pyrope wikiPageWikiLink Nesosilicate.
- Pyrope wikiPageWikiLink Olivine.
- Pyrope wikiPageWikiLink Peridotite.
- Pyrope wikiPageWikiLink Petrography.
- Pyrope wikiPageWikiLink Pyroxene.
- Pyrope wikiPageWikiLink Rhodolite.
- Pyrope wikiPageWikiLink Rhombic_dodecahedron.
- Pyrope wikiPageWikiLink Sapphirine.
- Pyrope wikiPageWikiLink Silicate_minerals.
- Pyrope wikiPageWikiLink Solid_solution.
- Pyrope wikiPageWikiLink Spessartine.
- Pyrope wikiPageWikiLink Thermochromic.
- Pyrope wikiPageWikiLink Thermochromism.
- Pyrope wikiPageWikiLink Thin_section.
- Pyrope wikiPageWikiLink Trapezohedron.
- Pyrope wikiPageWikiLink Ultramafic.
- Pyrope wikiPageWikiLink Ultramafic_rock.
- Pyrope wikiPageWikiLink File:Garnet_Group-Pyrope_Iron_aluminum_silicate_Barton_Mines,_Gore_Mountain,_Warren_County,_New_York_2861.jpg.
- Pyrope wikiPageWikiLinkText "Pyrope Garnet".
- Pyrope wikiPageWikiLinkText "Pyrope".
- Pyrope wikiPageWikiLinkText "pyrope".
- Pyrope absorption "broad band at 564nm with cutoff at 440 to 445nm. Fine gem quality pyropes may show chromium lines in the red end of the spectrum".
- Pyrope birefringence "Isotropic, appears black in cross-polarized light".
- Pyrope boxwidth "300".
- Pyrope caption "A gem-quality, emerald cut pyrope.".
- Pyrope category Nesosilicate.
- Pyrope category Silicate_minerals.
- Pyrope cleavage "None".
- Pyrope color "Red. Some varieties are very dark, almost black, while others can take tones of purple. Some chromium-rich pyropes are thermochromic, becoming green when heated".
- Pyrope fluorescence "inert".
- Pyrope formula "Mg3Al23".
- Pyrope fracture Conchoidal_fracture.
- Pyrope gravity "3.78".
- Pyrope habit "Euhedra typically display rhombic dodecahedral form, but trapezohedra are not uncommon, and hexoctahedra are seen in some rare samples. Massive and granular forms also occur.".
- Pyrope hasPhotoCollection Pyrope.
- Pyrope imagesize "250".
- Pyrope luster "greasy to vitreous".
- Pyrope mohs "7".
- Pyrope name "Pyrope".
- Pyrope opticalprop "Single refractive, often anomalous double refractive".
- Pyrope pleochroism "none".
- Pyrope polish "vitreous".
- Pyrope prop "Mineral association".
- Pyrope prop1text Biotite.
- Pyrope prop1text Diamond.
- Pyrope prop1text Hornblende.
- Pyrope prop1text Olivine.
- Pyrope prop1text Pyroxene.
- Pyrope refractive "1.74".
- Pyrope solubility "Insoluble in water, weakly soluble in HF".
- Pyrope streak "White".
- Pyrope strunz "9".
- Pyrope system Cubic_crystal_system.
- Pyrope wikiPageUsesTemplate Template:Infobox_mineral.
- Pyrope wikiPageUsesTemplate Template:Reflist.
- Pyrope subject Category:Aluminium_minerals.
- Pyrope subject Category:Garnet_group.
- Pyrope subject Category:Magnesium_minerals.
- Pyrope type ChemicalSubstance.
- Pyrope type Group.