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RM2021   Actinolite
   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2

Actinolite crystals are not usual with this size and definition. The specimen shows well-defined forms of the prism and monoclinic pinacoids, with the back side exfoliated. Intense green, almost black. A sample not usual for the species. It was determined that it is not an epidote, with which it could be confused, by Raman spectroscopy.

Size: 5.4 x 2.8 x 1.6 cm.
Found in 2018.
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