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Carroll Co., Maryland, USA

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Location is approximate, based on center of defined region.
Latitude & Longitude (WGS84): 39° North , 76° West (est.)
Neighbouring regions:

Carrol County bedrock is primarily complex early Cambrian to Late Precambrian igneous and metamorphic rocks of the Piedmont Province. Metamorphism has converted these metasedimentary and metavolcanic rocks to schists, gneiss, marble and quartzite. Meta-gabbros and metamorphosed ultramafic rocks have been converted to talc and amphibole-chlorite schists. These rocks are hosts of the iron, copper and cobalt deposits of the Sykesville Mining District, which were worked from the mid 1700's until early 1900's. The County is the type locality for carrollite, a copper-cobalt-nickel sulfide.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

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

52 valid minerals. 1 (TL) - type locality of valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

Rock Types Recorded

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Localities in this Region

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.


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Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p.
Stose, A. J. et. al. (1946) Carroll and Frederick Counties: Maryland Geological Survey: County Reports: 312 p.
Pearre, Nancy (1961) Mineral deposits of Maryland excluding fuel, sand and gravel: U.S. Geological Survey Mineral Investigations Resources Map MR-12.
Heyl, A. & Pearre, N (1965) Copper, zinc, lead, iron cobalt and barite deposits of the Piedmont Upland in Maryland: Maryland Geological Survey: Bulletin 28, 72 p.
Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.
Kuff, K. (1981) Mineral resources map of the New Windsor Quadrangle, Maryland: Mineral Resources Quadrangle Map #1: 1:24,000.
Kuff, K. (1981) Mineral resources map of the Union Bridge Quadrangle, Maryland: Mineral Resources Quadrangle Map #2: 1:24,000.
Kuff, K. (1981) Mineral resources map of the Finksburg and Sykesville Quadrangles, Maryland: Mineral Resources Quadrangle Map #3: 1:24,000.
Muller, P. D. (1994) Finksburg Geological Quadrangle Map 1:24,000: Maryland Geological Survey

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