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Name: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 gemdat.org for gemological information about Chlorastrolite. Currently in public beta-test.

Classification of Chlorastrolite

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Other Names for Chlorastrolite

Green StarstoneTurtle Back
Other Languages:

Other Information

Health Warning: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

Search Engines:
  • Look for Chlorastrolite on Google
  • Look for Chlorastrolite images on Google
  • Mineral Dealers:
  • Wilensky Fine Minerals
  • Search for Chlorastrolite on Well-Arranged Molecules
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • SpiriferMinerals.com - high quality low prices
  • The Arkenstone - Fine Minerals
  • Chlorastrolite specimens for sale - minfind.com
  • Buy from McDougall Minerals
  • Lapis Mineral Magazin
  • Buy minerals from YourMineralCollection
  • Buy fine minerals and gemstones from Pala International
  • Buy from Dave Bunk Minerals
  • Find Chlorastrolite on www.crystalclassics.co.uk
  • Localities for Chlorastrolite

    The 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. ? 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
    USGS PP144
      • 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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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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