Plagioclase from Ashland County, Wisconsin, USA

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USA
Wisconsin Ashland County ⓘ Ashland Black Granite Quarry	Leighton, M. W. (1954) Petrogenesis of a gabbro - granophyre complex in northern Wisconsin" Geological Society of America Bulletin: 65: 401-442.
Bad River ⓘ Penokee Gap	Klasner, J & G. LaBerge (1996) Field trip #5 Lake Namegakon and the Penokee Gap area, west Penokee Range in S. Nichols and L. Woodruff editors, Institute on Lake Superior, 42nd Annual Meeting, Part II Field Trip Guidebook: 83-108.
ⓘ English Lake	Van Hise, C. R. and R. Irving, 1892, The Penokee iron-bearing series of Northern Wisconsin and Michigan, U.S.Geo. Survey Monograph 19, 634 pp.
ⓘ Loon Lake quarries	Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078
Mellen ⓘ Unnamed pegmatite	Wilcox, Ray (1936) An occurrence of large, zircon needles in a basic pegmatite. American Mineralogist, 21 (7) 459
ⓘ Mineral Lake intrusion	Klewin, Kenneth, James Olmsted and Karl Seifert 1989, "Rock types and relationships of the Mellen Igneous Complex - a one day field trip to the Keweenawan of the Mellen, Wisconsin Area" Proceedings, 35th Meeting, Institute on Lake Superior Geology, Vol. 2, p. C1 - C-15.
ⓘ Mineral Lake sulfide orebody	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Potato River intrusion	Klewin, Kenneth, James Olmsted and Karl Seifert 1989, "Rock types and relationships of the Mellen Igneous Complex - a one day field trip to the Keweenawan of the Mellen, Wisconsin Area" Proceedings, 35th Meeting, Institute on Lake Superior Geology, Vol. 2, p. C1 - C-15.
ⓘ Quarry Road quarry	Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078
ⓘ Rearing Pond intrusion	Fitz, Tom (2011) Granitic, gabbroic and ultramafic rocks of the Mellen Intrusive Complex in northern WisconsinInstitute on Lake Superior Geology, 57th Annual Meeting, Ashland, WI, vol 57 (2): 163 - 184.