Actinolite
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Actinolite is an amphibole silicate mineral with the chemical formula Ca2Si8O222.
Actinolite crystal from Portugal
Gem-quality actinolite blade, from Mogok, Burma
Tremolite
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Tremolite is a member of the amphibole group of silicate minerals with composition Ca2Si8O222. Tremolite forms by metamorphism of sediments rich in dolomite and quartz, and occurs in two distinct form
Actinolite
…meaning "beam" or "ray", because of the mineral's fibrous nature. Actinolite is an intermediate member in a solid-solution series between magnesium-rich tremolite, Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2, and iron-rich ferro-actinolite, ☐Ca2(Mg2.5-0.0Fe2+2.5-5.0)Si8O22(OH)2. Mg and Fe ions can be freely exchanged…
Tremolite Campolungo
Tremolite from the Aure Valley, French Pyrenees (size: 8.2 × 6.7 cm)
Crystalline tremolite