About: Chlorastrolite   Sponge Permalink

An Entity of Type : dbkwik:resource/mN1SPtSK6DqXcZx381QGPQ==, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

Chlorastrolite is usually found as a filling in igneous rocks such as Basalt.

AttributesValues
rdf:type
rdfs:label
  • Chlorastrolite
  • Chlorastrolite
rdfs:comment
  • Chlorastrolite is usually found as a filling in igneous rocks such as Basalt.
  • Chlorastrolite occurs as amygdaloid structures and fracture fillings in basalt, and when the water and wave action has worn away the basalt, they are found as beach pebbles and granules in loose sediments. It is found in the Keweenaw Peninsula of the Upper Peninsula of Michigan and Isle Royale in Lake Superior. Isle Royale is a National Park, and so it is illegal to collect specimens there. It is difficult to identify an unpolished pebble of chlorastrolite. Most gem quality chlorastrolite stones are very small, and it is rare to find one that is larger than a half inch. The largest gem quality stone is in the Smithsonian Museum and measures 1.5 by 3 inches.
sameAs
dcterms:subject
dbkwik:ceramica/pr...iPageUsesTemplate
Name
  • Chlorastrolite
dbkwik:geology/pro...iPageUsesTemplate
SG
  • 3(xsd:double)
Hard
  • 5(xsd:double)
RM
  • Mineral
lust
  • Pearly
chemcomp
  • Ca2Al22·H2O.
abstract
  • Chlorastrolite is usually found as a filling in igneous rocks such as Basalt.
  • Chlorastrolite occurs as amygdaloid structures and fracture fillings in basalt, and when the water and wave action has worn away the basalt, they are found as beach pebbles and granules in loose sediments. It is found in the Keweenaw Peninsula of the Upper Peninsula of Michigan and Isle Royale in Lake Superior. Isle Royale is a National Park, and so it is illegal to collect specimens there. It is difficult to identify an unpolished pebble of chlorastrolite. Most gem quality chlorastrolite stones are very small, and it is rare to find one that is larger than a half inch. The largest gem quality stone is in the Smithsonian Museum and measures 1.5 by 3 inches. 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.
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