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Animikie Red Ace pegmatite, Pine River pegmatites, Fern, Florence Co., Wisconsin, USA

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Latitude & Longitude (WGS84): 45° 51' 2'' North , 88° 21' 10'' West
Latitude & Longitude (decimal): 45.85056,-88.35278

The most complex and largest pegmatite in the Hoskins Lake pegmatite field. These pegmatites are as yet undated but probably are related to the intrusion of 1,760 million-year-old Bush Lake Granite. Location is in Sec 22, T39N R17E. The coordinates mark a prominent outcrop. This locality is now part of the "Pine River Wild Rivers Area", and collecting is no longer permitted.

Mineral List

45 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

1600 - 2500 Ma
Mafic metavolcanic rocks

Age: Proterozoic (1600 - 2500 Ma)

Description: Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.

Comments: Pembine-Wausau terrane

Lithology: Major:{basalt,basaltic andesite}, Minor:{metagabbro,ultramafic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Falster, A. , W.B. Simmons & P.B. Moore (1988) Fillowite, Lithiophilite, Heterosite/Purpurite and Alluaudite-Varulite Group Minerals from a Pegmatite in Florence County, WI, Abst. 15th Rochester Mineralogical Symposium, Rocks and Minerals: 63(6) p. 455.

Falster, A. U., W.B. Simmons & K. L. Webber (1995) Niobium-Tantalum minerals from the Animikie Red Ace Pegmatite, Florence County, Wisconsin: Rocks and Minerals: 70(2): 126-127.

Falster, A., W.B. Simmons & P.B. Moore (1996) The mineralogy and geochemistry of the Animikie Red Ace pegmatite in Florence County, Wisconsin: Rec. Res. Dev. Mineral: 1: 7-67.

Falster, A. U. (2001), A second world occurrence for behierite in Florence County, Wisconsin: Proceedings 28th Rochester Mineralogical Symposium: 8-9.

Sirbescu, M. L. C., E. E. Hartwick, E.E., & J. J. Student (2008): Rapid crystallization of the Animikie Red Ace Pegmatite, Florence County, northeastern Wisconsin: inclusion microthermometry and conductive-cooling modeling. Contributions to Mineralogy and Petrology: 156: 289-305.

External Links

Wisconsin Mineral index - Wisconsin Geological and Natural History Survey

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