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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.
Captain Aaron G. Peer was born in Dundas, Ontario, in 1812, and moved to Algonac, Michigan, in 1821. In 1833, Peer and his brother built a schooner and went in to the lake transport business, locating at the tip of Michigan's thumb. Peer also began a grindstone quarry at this site, and by 1850 was selling $3000 of grindstones a year.
Metamorphosed pillow lava from the Ishpeming Greenstone Belt in Michigan Greenstone belts have been interpreted as having formed at ancient oceanic spreading centers and island arc terranes . Greenstone belts are primarily formed of volcanic rocks, dominated by basalt , with minor sedimentary rocks inter-leaving the volcanic formations.
Isle Royale, the largest island in Lake Superior, is over 45 mi (72 km) in length and 9 mi (14 km) wide at its widest point. [6] The park is made up of Isle Royale itself and approximately 400 smaller islands, along with any submerged lands within 4.5 mi (7.2 km) of the surrounding islands ( 16USC408g ).
Greenstone (archaeology), various types of stone used by early cultures, covering jade and similar stones 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
Location of Michigan within the United States. The following is a List of Michigan State Historic Sites.The register is maintained by the Michigan State Historic Preservation Office, which was established in the late 1960s after the passage of the National Historic Preservation Act of 1966. [1]
The island is composed largely of ridges, running roughly southwest-to-northeast. The main ridge, Greenstone Ridge, is over 1,000 feet (300 m) in many places. Greenstone belts are exposed, with rounded stones of chlorastrolite, also known as greenstone, near and in the lake. MODIS image of Isle Royale
The Greenstone Ridge Trail is a 40-mile-long (64 km) hiking trail on Isle Royale, in Lake Superior, northern Michigan. The island is within Isle Royale National Park. There are no roads on the island, a wilderness area and national park, so the trail doubles as the primary means of land transportation across the island. [1] [2]