| General Information |
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| Chemical Formula | | Ca | | (Mg,Fe,Mn,Al) | | (SiO | | )(Si | | O | | )(OH) | | · H | | O |
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Physical Properties of Pumpellyite Subgroup |
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| Mohs Hardness | 5 to 6Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Specific Gravity | 3.20 to 3.30Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Properties of Pumpellyite Subgroup |
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| Refractive Index | 1.674 to 1.764Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Character | Biaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Birefringence | 0.014 to 0.016Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Colour |
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| Colour (General) | Green, whiteUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Causes of Colour | Green (chlorastrolite), Fe2+-O-Fe3+ charge transfer coordination, plus Fe2+W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) |
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| Transparency | OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Further Information |
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| Mineral information: | Pumpellyite Subgroup information at mindat.org |
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