Original description: ‘ferroactinolite’ Sundius, N., 1946. The classification of the hornblendes and the solid solution relations in the amphibole group — Sveriges Geologiska Undersökning 40 (4): 7 [
view in ‘Library’].
Type locality: unknown.
Type material: unknown.
Etymology: named for its similarity to actinolite.
Distribution: probably widespread, but many locality references lack qualifying chemical analyses (
Anthony et al., 2001—2005).
Chemistry
{Ca2}{Fe2+5}(Si8O22)(OH)2
Essential elements: hydrogen (H), oxygen (O), silicon (Si), calcium (Ca), iron (Fe).
Crystal data
Crystallography: monoclinic — prismatic.
Crystal habit: as bladed or columnar crystals; granular to massive.
Twinning: simple or lamellar (
Anthony et al., 2001—2005).
Material from ‘Repository’
1 specimen: 0598 — 2.79 ct, Russia, Siberian District, Eastern Sayan.
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