Actinolite Hydrous calcium magnesium iron silicate Ca2(Mg,Fe)5Si8O22(OH)2

Actinolite in the East Region No notable occurrences in database yet. Actinolite in the Front Range Region No notable occurrences in database yet. Actinolite in the Northwest Region No notable occurrences in database yet. Actinolite in the South Central Region Chaffee County - Calumet Mine - Homestake Mine - Midway Springs - Rock King Mine - Sedalia Mine Actinolite in the Southwest Region Gunnison County - North Italian Mountain

Actinolite sprays from the Homestake Mine quarry. Grayish-green actinolite from the Homestake Mine. Specimen is 6 cm long. Blocky actinolite pseudomorphs after diopside (uralite) up to 15 mm from the Calumet Iron Mine, near Salida, Chaffee County. The pseudomorphs are olive-green and extend into the cavity from all directions. Measures 11 x 7 x 7 cm. Photo courtesy of © John Betts - Fine Minerals.

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