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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.
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. Not every state has an official state mineral, rock, stone and/or gemstone, however.
Greenstone belt, Archean and Proterozoic volcanic–sedimentary rock sequences Isle Royale greenstone Chlorastrolite, found in the Keweenaw Peninsula of Michigan and Isle Royale in the US Pounamu (New Zealand jade/greenstone), several types of hard and durable stone found in southern New Zealand
Recent analyses by the USGS of both unmineralized basalt and copper-mineralized rock show that a small amount of naturally occurring mercury is associated with mineralization. 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.
Chlorite does not have any specific industrial uses of any importance. Some rock types containing chlorite, such as chlorite schist, have minor decorative uses or as construction stone. However, chlorite is a common mineral in clay, which has a vast number of uses. [9]
Image credits: Furious Thoughts You can also use Google Earth to explore the planet and various cities, locations, and landscapes using coordinates.The program covers most of the globe (97% back ...
Since its discovery, Asteroid 2024 YR4 has warranted international attention, and large telescopes around the world continue to track the space rock before it fades out of view behind the Sun this ...
A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.