Actinolite is the name for the intermediate group of minerals that make up the middle of the tremolite-ferroactinolite solid solution series. These minerals form in metamorphic environments, most notably greenschist facies. Nephrite actinolite is a variety of jade along with the mineral jadeite.
| Ca2(Mg,Fe)5Si8O22(OH)2 |
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| Inosilicate |
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| Monoclinic |
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| 2/m |
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| 5-6 |
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| 3.0-3.3 |
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| {110} perfect |
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| Splintery, uneven |
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| Green |
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| White |
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| Vitreous, silky |
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| Transparent/translucent |
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| Fibrous, radial, massive |
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| Very tough and difficult to break, easily carved |
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| Notable Localities: |
New Zealand; British Columbia, Canada; Lake Baikal, Russia; Wyoming |
| Uses: |
Ornamental stone, insulation |
Specimens:
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