General Information |
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A variety or type of: | Garnet Group |
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Varieties/Types: | |
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Chemical Formula | Arthur Thomas, Gemstones (2009) |
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Pyrope Simulants |
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Imitations are made with red glass. - Gemstones of the world, Walter Schumann, 2001, p 104 |
Physical Properties of Pyrope |
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Mohs Hardness | 7 to 7.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Specific Gravity | 3.62 to 3.87Walter Schumann, Gemstones of the world (2001) More from other references |
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Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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Cleavage Quality | IndistinctWalter Schumann, Gemstones of the world (2001) More from other references |
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Fracture | ConchoidalArthur Thomas, Gemstones (2009) |
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Optical Properties of Pyrope |
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Refractive Index | 1.720 to 1.756Walter Schumann, Gemstones of the world (2001) More from other references |
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Optical Character | IsotropicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Pleochroism | AbsentWalter Schumann, Gemstones of the world (2001) |
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Dispersion | 0.022Arthur Thomas, Gemstones (2009) |
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Colour |
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Colour (General) | Red, brownish-redUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Causes of Colour | Brownish-red, Fe2+ in distorted cubic coordination. Red, Fe2+ in distorted cubic site plus Cr3+ in octahedral coordination. Color change (in pyrope and pyrope-spessartine), V3+ and/or Cr3+ in octahedral coordinationW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) |
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Transparency | TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Lustre | VitreousArthur Thomas, Gemstones (2009) |
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Fluorescence & other light emissions |
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Fluorescence (General) | Mostly noneWalter Schumann, Gemstones of the world (2001) |
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Crystallography of Pyrope |
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Crystal System | IsometricHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Habit | Rare in crystal formArthur Thomas, Gemstones (2009) More from other references |
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Geological Environment |
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Where found: | In ultramafic rocks, as peridotites, kimberlites, eclogites, serpentinites, and in "hornblende"-garnet-plagioclase rocks and anorthosites. Also in amphibole and biotite schists, and as a detrital mineral.Anthony et al, Handbook of mineralogy (2001) |
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Inclusions in Pyrope |
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Low-relief rounded crystals (such as apatite and zircon), acicular crystals - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 3 |
Further Information |
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Mineral information: | Pyrope information at mindat.org |
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Significant Gem Localities |
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| China | |
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| | | Czech Republic | |
| Zang and Gilg (2008) | | Kenya | |
| Barot (1993) | | Kyrgyzstan | |
| | | Madagascar | |
- Color-changing Garnet Mining Field
| Henn (1999) | | Mongolia | |
| Dill et al. (2004, 2006) | | Russia | |
| P. Lyckberg (2009) |
| P. Lyckberg (2009) | | Sri Lanka | |
| Milisenda and Henn (1999) |
| Chandrajith et al. (1998) |
| Chandrajith et al. (1998) | | Zambia | |
| Johnson et al. (1999) |
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