| General Information |
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| Varieties/Types: | Larimar - Blue variety of pectolite found in Dominican Republic |
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| Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Pectolite Simulants |
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| Sometimes used as jade simulant - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 5 |
| Physical Properties of Pectolite |
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| Mohs Hardness | 5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Specific Gravity | 2.74 to 2.90Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Tenacity | BrittleArthur Thomas, Gemstones (2009) |
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| Cleavage Quality | PerfectMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Fracture | SplinteryArthur Thomas, Gemstones (2009) |
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| Optical Properties of Pectolite |
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| Refractive Index | 1.595 to 1.645Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Optical Character | Biaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Birefringence | 0.032 to 0.038Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Pleochroism | NilArthur Thomas, Gemstones (2009) |
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| Dispersion | Very weakArthur Thomas, Gemstones (2009) |
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| Colour |
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| Colour (General) | Blue, bluish-white, white, grayUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Causes of Colour | Blue, Cu2+ in octahedral coordinationW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) |
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| Transparency | Translucent,OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Lustre | SilkyHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Fluorescence & other light emissions |
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| Fluorescence (Short Wave UV) | Yellow-orange common and phosphorescenceHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Fluorescence (Long-Wave UV) | May show orange-pink fluorescence under (material from Bergen Hill New York, USA) and a yellow fluorescence with green phosphorescence(Paterson, New Jersey, USA)Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Crystallography of Pectolite |
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| Crystal System | TriclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Habit | Globular masses, the rarer crystals showing tabular habitMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Geological Environment |
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| Where found: | Occurs in nepheline syenites and fine crystalsMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Further Information |
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| Mineral information: | Pectolite information at mindat.org |
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| Significant Gem Localities |
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| Canada | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 435 |
- La Vallée-du-Richelieu RCM
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 435 | | Dominican Republic | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 435 |
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