1) Amphibole 2) Beautiful stone 3) Cut mineral 4) Decorative stone 5) Gemstone mineral 6) Gemstone 7) Jewel mineral 8) Jewel 9) Magnesium mineral 10) Mineral jewel 11) Mineral gemstone 12) Monoclinic mineral 13) Polished jewel 14) Polished mineral 15) Precious gemstone 16) Prized mineral 17) Precious jewel 
• (n.) A bright green variety of amphibole occurring usually in fibrous or columnar masses.
an amphibole mineral in the tremolite-actinolite series of calcium, magnesium, and iron silicates. The minerals in this series are abundant in ... [1 related articles]
Ac·tin'o·lite noun [ Greek ..., ..., ray + -lite .] (Min.) A bright green variety of amphibole occurring usually in fibrous or columnar masses. 
Actinolite is a mineral that commonly occurs in crystalline schists, often being the chief constituent of green-coloured schists and greenstones. It is used somewhat as an asbestos material. It has the formulae Ca2(Mg,Fe)5Si8O22(OH)2 (the same as nephrite, but being less attractive and harder to cut and polish is less valuable than nephrite) and a ...
[n] - a green mineral of the amphibole group
noun a green mineral of the amphibole group; calcium magnesium iron silicate
a variety of amphibole, occurring in greenish bladed crystals or in masses.