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Green star stone. First discovered on Isle Royale, Lake Superior by C. T. Jackson and J. D. Whitney in 1847.
A variety of Pumpellyite-(Mg)

Chatoyant and generally exhibits a distinctive and attractive mosaic or segmented pattern, sometimes referred to as "turtleback". State gemstone of Michigan.
Originally described from Isle Royale National Park, Lake Superior, Keweenaw Co., Michigan, USA.

Visit for gemological information about Chlorastrolite.

Classification of Chlorastrolite URL:
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Other Names for Chlorastrolite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chlorastrolite

Reference List:
Norman King Huber(1975)
The geologic story of Isle Royale National Park.
United States Geological Survey Bulletin 1309

Internet Links for Chlorastrolite

Localities for Chlorastrolite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Michigan
    • Houghton Co.
      • Hancock
      • Ripley
    • Keweenaw Co.
      • Central
Mineralogy of Michigan (2004) Heinrich & Robinson
Mineralogy of Michigan (2004) Heinrich & Robinson
Mineralogy of Michigan (2004) Heinrich & Robinson
Mineralogy of Michigan (2004) Heinrich & Robinson
      • Copper Harbor
        • Mosquito District
Personally collected by Paul Brandes in 2013
      • Delaware
Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2
      • Lake Superior
USGS Bull 1309
Gems and Minerals of America- Jay Ellis Ransom-1974
Mineralogy of Michigan (2004) Heinrich & Robinson
Mineralogy of Michigan (2004) Heinrich & Robinson
Mineralogy of Michigan (2004) Heinrich & Robinson
      • Mandan
Mineralogy of Michigan (2004) Heinrich & Robinson
      • Phoenix
self collected at site, and verified through red metal minerals
Yalmer Primeau collection
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