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Plumbago North, Newry, Oxford Co., Maine, USA

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World's largest spodumene crystal by mass

Plumbago North, Newry, Oxford Co., Maine, USA
10m long spodumene crystal exposed at Plumbago North

Plumbago North, Newry, Oxford Co., Maine, USA
World's largest spodumene crystal by mass

Plumbago North, Newry, Oxford Co., Maine, USA
10m long spodumene crystal exposed at Plumbago North

Plumbago North, Newry, Oxford Co., Maine, USA
World's largest spodumene crystal by mass

Plumbago North, Newry, Oxford Co., Maine, USA
Latitude & Longitude (WGS84): 44° 32' 43'' North , 70° 44' 35'' West
Latitude & Longitude (decimal): 44.54528,-70.74333
Köppen climate type:Dfb : Warm-summer humid continental climate

Plumbago North is a new prospect pit in an LCT pegmatite most likely of the spodumene-albite subtype. The pegmatite strikes NW. The pegmatite hosts some of the world's largest spodumene crystals as well as huge (>3m) montebrasite crystals. Given the size of these crystals, the pegmatite body most probably is of similarly huge proportions. Exploration work is on-going (fall 2017).

Mineral List

11 valid minerals.

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

252.17 - 541 Ma

ID: 3187973
Paleozoic sedimentary rocks

Age: Paleozoic (252.17 - 541 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Emsian - Pragian
393.3 - 410.8 Ma

ID: 2887645
Devonian Littleton Formation

Age: Early Devonian (393.3 - 410.8 Ma)

Stratigraphic Name: Littleton Formation

Comments: Ironbound Mountain Formation exposed in two major belts within and beyond Penobscot Lake region. Two minor strike belts are thrust faulted and contained within the region. Southeastern major belt is partly mapped into areas previously identified as Seboomook Formation. Northwestern belt is underlain entirely by the Grenier Ponds Member. Most characteristic lithology of the Ironbound Mountain is thinly bedded, well-cleaved, medium- to dark gray mudstone and siltstone slate. Beds range from 1 to 30 cm. Locally contains minor beds of matrix-supported conglomerate. Stratigraphically underlies North East [Northeast] Carry Formation. Unit may span the Silurian-Devonian boundary and range from possibly latest Pridolian to earliest Gedinnian. (ME011) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith A - Pelite.

Lithology: Major:{schist}, Minor:{metasandstone,metasiltstone,gneiss}

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

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