cummingtonite


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cummingtonite

(ˈkʌmɪŋtəˌnaɪt)
n
an amphibole mineral, magnesium iron silicate hydroxide, found in metamorphic rocks
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References in periodicals archive ?
Subsolidus alteration is manifested by the formation of a secondary paragenesis mainly consisting of chlorite, sericite and a secondary green--to colourless amphibole (Mg-hornblende to actinolite and cummingtonite) at the expense of the primary minerals.
Dominant primary manganese minerals include spessartine, tephroite, rhodonite, pyroxmangite, neotocite, bementite, Mn-rich cummingtonite, rhodochrosite and Mn-rich apatite (Pires, 1977, 1983).
Cummingtonite [(Mg,Fe).sub.7][Si.sub.8][O.sub.22][(OH).sub.2]
35 (1997), (= cummingtonite) 219 Magnesio-gedrite (= gedrite) Leake et al.: Can.
with Cummingtonite, forms a series with Ferro-anthophyllite, Amphibole group, Can.