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Petoskey Stone
A rock often used for lapidary and fashioned into jewellery items, it is composed of a fossil coral, the devonian-age (350 million year old) Hexagonaria percarinata. It is found in the northern part of Michigan.
In 1965 it was named the State Stone of Michigan.
Photos of natural/un-cut material from mindat.org
Further Information
Mineral information:
Petoskey Stone information at mindat.org
Significant Gem Localities
Canada
Québec
Capitale-Nationale
Charlevoix RCM
Saint-Urbain
Saint-Urbain-de-Charlevoix
Gems and Minerals of America- Jay Ellis Ransom-1974
USA
Michigan
Charlevoix Co.
Charlevoix
Medusa Cement
Field observation by Paul Brandes.
Cheboygan Co.
Gems and Minerals of America- Jay Ellis Ransom-1974
Crawford Co.
Frederic
Unnamed gravel pit
Paul Brandes
Emmet Co.
Petoskey
Mineralogy of Michigan (E. W. Heinrich & G. W. Robinson)
Keweenaw Peninsula
Mineralogy of Michigan (2004) Heinrich & Robinson
Oceana Co.
Gems and Minerals of America- Jay Ellis Ransom-1974
Presque Isle Co.
Gems and Minerals of America-Jay Ellis Ransom-1974