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Chlorastrolite, also known as Isle Royale Greenstone, is a green or bluish green stone. [1] Chlorastrolite has finely radiating or stellate (for examples, see crystal habits) masses that have a "turtleback" pattern. The stellate masses tend to be chatoyant, meaning they have a varying luster. This chatoyancy can be subtranslucent to opaque.
Native copper and chlorastrolite, the official state gem of Michigan, are secondary minerals filling pore spaces formed by vesicles and fractures within the volcanic rocks. Prehnite and agate amygdules are also plentiful island gemstones. [15]: 55, 58–61
This article about a specific silicate mineral is a stub. You can help Wikipedia by expanding it.
The largest group of minerals by far are the silicates, which are composed largely of silicon and oxygen, with the addition of ions such as aluminium, magnesium, iron and calcium.
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Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc.
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Andradite is a mineral species of the garnet group.It is a nesosilicate, with formula Ca 3 Fe 2 Si 3 O 12.. Andradite includes three varieties: Colophonite: a historical variety found in the Scandinavian islands, brownish or reddish in color, often opaque or translucent.