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Beemerville main nepheline-syenite mass, Libertyville, Wantage Township, Sussex Co., New Jersey, USA

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Latitude & Longitude (WGS84): 41° 13' 56'' North , 74° 41' 45'' West
Latitude & Longitude (decimal): 41.23222,-74.69583
Köppen climate type:Dfb : Warm-summer humid continental climate

A nepheline-syenite mass comprised of dikes and sills plus a laccolith (?) in Martinsburg Shale. Located about 2 miles NNW of Beemersville on the SE flank of Kittatinny Mountain. This is a significant igneous body which has yet to be exploited for any purpose except specimen collecting on the outcrop.

Mineral List

20 valid minerals.

Rock Types Recorded

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Mineralization age: Llandovery : 437 ± 22 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
ⓘ Biotite437 ± 22 Ma

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 - Sandbian
393.3 - 458.4 Ma

ID: 3006647
Nepheline syenite

Age: Paleozoic (393.3 - 458.4 Ma)

Stratigraphic Name: Beemerville Intrusive Suite

Description: Medium- to dark-gray, medium- to coarse-grained, alkalic to alkalic-calcic nepheline syenite. Composed principally of nepheline, orthoclase, biotite, and clinopyroxene, and accessory minerals are magnetite, apatite, titanite, zircon, and pyrite. Restricted to two small bodies northwest of Beemerville. Intrudes the Martinsburg Formation, but appears to be unconformably overlain by the Shawangunk Formation. K-Ar and Rb-Sr ages of 435ñ20 Ma from biotite (Zartman and others, 1967) and a fission track date from titanite of 422ñ14 Ma (Eby and others, 1992) suggest emplacement in Late Ordovician to Early Silurian.

Comments: Beemerville Intrusive Suite (Early Silurian? and Late Ordovician) (Drake and Monteverde, 1992). Note that there is a unit SObl (Lamprophyre, ect...) that is described in the digital description and is used on the printed map; but it is NOT used on the digital map. Probably because it is a line feature and the digital geology is only polygons. Unit SObl has NOT been entered here.

Lithology: Major:{nepheline syenite}

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
New Jersey State Geologist Annual Report (1896): 92-94.
Rutgers University, the State University of New Jersey, Bulletin No. 5, Part 1: 53-54.
Manchester, J. G. (1931), The Minerals of New York City & Its Environs, New York Mineral Club Bulletin: 3(1): 65.
Wilkerson, A.S. (1946), Nepheline Syenite from Beemerville, Sussex County, New Jersey. American Mineralogist: 31: 284-287.
Eby, G. N. (2004), Petrology, geochronology, mineralogy, and geochemistry of the Beemerville alkaline complex, northern New Jersey. In Puffer, J. H. and Volkert, R. A. (eds.) Neoproterozoic, Paleozoic, and Mesozoic Intrusive Rocks of Northern New Jersey and Southeastern New York. Twenty-First Annual Meeting Geological Association of New Jersey, Mahwah, NJ, pp. 52-68.

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