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Chlorastrolite is a green or bluish green stone, usually with finely radiated or stellate masses. Stellate masses tend to be chatoyant. It can be subtranslucent to opaque. It is a variety of pumpellyite: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2·H2O. Chlorastrolite was once thought to be an impure variety of prehnite or thomsonite.
Additional recommended knowledge
It occurs as amygdaloids and fracture fillings in basalt and as beach pebbles and granules in loose sediments, derived from those rocks.
It was first described from Isle Royale, Lake Superior by C. T. Jackson and J. D. Whitney in 1847. Chlorastrolite, also known as greenstone, is the official state gem of Michigan.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chlorastrolite". A list of authors is available in Wikipedia.|