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Buckwheat pit (Southwest opening; Buckwheat Mine), Franklin Mine, Franklin, Franklin mining district, Sussex Co., New Jersey, USA

This page kindly sponsored by Christopher O'Neill
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Latitude & Longitude (WGS84): 41° 6' 52'' North , 74° 35' 13'' West
Latitude & Longitude (decimal): 41.11472,-74.58722
GeoHash:G#: dr6cysxnx
Locality type:Pit
Köppen climate type:Dfb : Warm-summer humid continental climate

The Buckwheat workings started as the Buckwheat Mine and the Southwest Opening, both at the southern end of the Franklin orebody. Subsequently, that portion of the orebody, at the shallow end where the two limbs of the orebody curved around and, vertically, form a "spoon" shaped basin, was excavated as the Buckwheat Pit. This later major working obliterated the two prior workings in total. The Buckwheat Pit incorporated areas intruded by pegmatites and featured major, vertical camptonite igneous dike intrusive bodies plus a veinlike body of vuggy dolomite (the Buckwheat Dolomite) of apparent Paleozoic age. All of these geological features contributed to the diverse mineralogy of this locality. This locality is within the Franklin Mining District. The complete list of mineral species occurring within this district, as well as the official boundaries of the district, can be found under the locality file for "Franklin Mining District."

Mineral List

Mineral list contains entries from the region specified including sub-localities

71 valid minerals. 7 (TL) - type locality of 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 Macrostrat.org

1000 - 1600 Ma

ID: 2874051
Franklin Marble

Age: Mesoproterozoic (1000 - 1600 Ma)

Stratigraphic Name: Franklin Marble

Description: White- to light-gray-weathering, white, grayish-white, or, less commonly pinkish-orange, coarse- to locally fine-crystalline calcite marble with accessory amounts of graphite, phlogopite, chondrodite, clinopyroxene, and serpentine. Contains pods and layers of clinopyroxene-garnet skarn, hornblende skarn, and clinopyroxene-rich rock. Thin layers of metaquartzite occur locally. Intruded by the Mount Eve Granite in the Pochuck Mountain area. Franklin Marble is host to the Franklin and Sterling Hill zinc ore bodies; exploited for talc and asbestiform minerals near Easton, Pennsylvania. Subdivided into an upper marble, "Wildcat marble," and a lower marble, "Franklin marble," by New Jersey Zinc Co. geologists (Hague and others, 1956).

Comments: Metasedimentary Rocks (Middle Proterozoic)

Lithology: Major:{marble}, Minor:{skarn,quartzite}

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]

1000 - 1600 Ma

ID: 3188605
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1000 - 1600 Ma)

Lithology: Paragneiss; paragneiss

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]

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

Localities in this Region
Show map

  • New Jersey
    • Sussex Co.
      • Franklin mining district
        • Franklin
          • Franklin Mine
            • Buckwheat Pit (Southwest Opening; Buckwheat Mine)

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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)
Palache, Charles (1935) USGS Professional Paper 180: 26, 28, 29, 32, 35, 39, 41, 43, 47, 49, 50, 55, 56, 57, 61, 67, 71, 77, 86, 89, 104, 106, 119.
Gordon, S.G. (1951) Brookite Crystals from Franklin, New Jersey: Rocks & Minerals: 26: 510-511.
Palache, C., Berman, H., and Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 780.
Casperson, W.C. (1956) Heulandite and Stilbite. Rocks & Minerals: 31: 245. (or (1957), vol. 32).
Albanese, John S. (1967) Chlorophoenicite. Rocks & Minerals: 42: 888-889.
Cook, D.K. (1973) Recent Work on the Minerals of Franklin and Sterling Hill, New Jersey. Mineralogical Record: 4: 62-66.
American Mineralogist (1980) 65: 196-199.
Dunn, Pete J. et al. (1982) Jarosewichite and a related phase: basic manganese arsenates of the chlorophoenicite group from Franklin, New Jersey. American Mineralogist: 67: 1043-1047.
Peters et al. (1983) Minerals of the Buckwheat dolomite, Franklin, New Jersey. Mineralogical Record: 14: 183-194.
Germine, M. (1985) Fibrous Rutile from Franklin, New Jersey. Mineralogical Record: 16: 483-484.
Essene, E.J. and Peacor, D.R. (1987) Petedunnite (CaZnSi2O6), a new zinc clinopyroxene from Franklin, New Jersey, and phase equilibria for zincian pyroxenes. American Mineralogist: 72: 157-166.
Dean, Omar S. (1990) Those rare uraninites from Franklin and Sterling Hill, New Jersey. The Picking Table: 31(2): 7-11.
Dunn, Pete J. et al. (1992) Franklinphilite, the manganese analog of stilpnomelane, from Franklin, New Jersey. Mineralogical Record: 23: 465-468.
Dunn, Pete J. (1995) Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits, Part 3: 363, 369, 414, 436.
Dunn, Pete J. (1995) Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits, Part 4: 465, 470-471, 472, 485, 510, 513, 535, 584, 585, 592, 600, 604-605, 609, 615, 616.
Dunn, Pete J. (1995) Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits, Part 5: 627, 644, 650, 665, 668, 669-670.
Nikischer, T. (1995) The Picking Table: 36(2): 11.
Bearss, G. and Cianciulli, J. (2000) Synchysite-(Y). The Picking Table: 41(2): 17-18.
The Picking Table (2000) 41(2): 20-21 (Thorutite).

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