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Morefield Mine (Morefield pegmatite), Winterham, Amelia Co., Virginia, USA

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Mine owner Sam Dunaway with pegmatite

Morefield Mine, Winterham, Amelia Co., Virginia, USA
Face of vertical pegmatite before diabase dike

Morefield Mine, Winterham, Amelia Co., Virginia, USA
Mine owner Sam Dunaway with pegmatite

Morefield Mine, Winterham, Amelia Co., Virginia, USA
Face of vertical pegmatite before diabase dike

Morefield Mine, Winterham, Amelia Co., Virginia, USA
 
Latitude & Longitude (WGS84): 37° 21' 38'' North , 77° 54' 50'' West
Latitude & Longitude (decimal): 37.36056,-77.91389
Köppen climate type:Cfa : Humid subtropical climate


A feldspar-mica and specimen mine in the Morefield pegmatite.
Located near Winterham, near Amelia Court House. Started 1929 and owned by S.V. Morefield.

Note: a for-fee collecting area (primarily for kids), which includes salted minerals brought in from outside of the area, is operated here by the owners.

Mineral List


64 valid minerals. 4 erroneous literature entries.

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

Mesoproterozoic
1000 - 1600 Ma



ID: 2999408
Porphyroblastic Garnet-Biotite Gneiss

Age: Mesoproterozoic (1000 - 1600 Ma)

Description: Heterogeneous layered sequence is dominantly garnetiferous biotite gneiss and porphyroblastic gneiss, migmatitic in part, with subordinate interlayered amphibolite and amphibole gneiss (Ya), pelitic-composition gneiss, calcsilicate gneiss, biotite hornblende-quartz-plagioclase gneiss, and garnetiferous leucogneiss. These lithologies contain amphibolite-facies metamorphic mineral assemblages consistent with rock chemistry. Farrar (1984) reports relict granulite-facies assemblages in some rocks. This unit underlies a wide area that surrounds the State Farm antiform (Poland, 1976; Reilly, 1980; Farrar, 1984) and two subsidiary antiforms to the northeast; the unit includes the Maidens gneiss and portions of the Sabot amphibolite of Poland (1976), the eastern gneiss complex and Boscobel granodiorite gneiss of Bobyarchick (1976), and the Po River Metamorphic Suite of Pavlides (1980). Poland (1976) and Reilly (1980) proposed that the Maidens gneiss and Sabot amphibolite were a Late Precambrian- to Early Paleozoic-age volcanic-sedimentary cover sequence unconformably overlying the State Farm gneiss. Farrar (1984) interpreted relict granulite-facies mineral assemblages to have equilibrated during Grenville-age regional metamorphism; this contributed to his conclusion that the Sabot and Maidens, in addition to the State Farm, are Grenville or pre-Grenville in age. Porphyroblastic garnet-biotite gneiss (Ymd) is intruded by rocks of the Carboniferous-age Falmouth Intrusive Suite (Pavlides, 1980).

Comments: Eastern Piedmont

Lithology: Major:{biotite 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 Macrostrat.org, used under Creative Commons Attribution 4.0 License



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.

References

Rocks & Minerals (1933): 8: 143-144.

USGS Bulletin 248B (1952).

Brown, W.R. (1962) Mica and Feldspar Deposits of Virginia.

Penick, D. Allen, Jr. (1985): Virginia Mineral Locality Index. Rocks and Minerals: 60(4): 165.

Sweet, P.C. and Penick, D.A., Jr. (1986), Morefield Pegmatite Mine Reopens - Virginia's only Active Underground Gem Mine.

Kearns, Lance E. (1993), Minerals of the Morefield Pegmatite, Amelia County, Virginia. Rocks & Minerals: 68(4): 232-242.

Kearns, Lance E. (1995), Alumino-fluorides from the Morefield pegmatite, Amelia County, Virginia. Mineralogical Record: 26(6): 551-556.

O’Neill, K. A.; Nowak, B. A.; Johnson, C. B.; Kearns, L. E. (1996), Contributed Papers in Specimen Mineralogy: 22nd Rochester Mineralogical Symposium, Mineral Chemistry of Micas and Amazonite: The Morefield Pegmatite, Amelia, Virginia. Rocks & Minerals: 71(3): 198-199.

Virginia Minerals, Virginia Division of Mineral Resources, Charlottesville, Virginia: 32(2).

Virginia Division of Mineral Resources Report 3, Charlottesville, Virginia: 59-60, 61-94.

Virginia Geologic Survey Bulletin 33.

Virginia Minerals, Vol. 46.

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