Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Dolyhyde Mine (Dolly Hyde Mine), Libertytown, Frederick County, Maryland, USAi
Regional Level Types
Dolyhyde Mine (Dolly Hyde Mine)Mine
LibertytownCensus-designated Place
Frederick CountyCounty
MarylandState
USACountry

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Latitude & Longitude (WGS84):
39° 28' 41'' North , 77° 13' 37'' West
Latitude & Longitude (decimal):
39.47831,-77.22717
GRN:
N27W43
Type:
Mine - last checked 2024
Köppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Libertytown950 (2011)1.4km
Linganore8,543 (2011)4.5km
Woodsboro1,196 (2017)9.7km
Walkersville5,993 (2017)10.7km
Union Bridge971 (2017)11.0km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Mason-Dixon Rock, Mineral, Gemological, & Lapidary ClubHanover, Pennsylvania41km
Gem, Lapidary, and Mineral Society of Montgomery County, MD., Inc.Rockville, Maryland44km
Mindat Locality ID:
10778
Long-form identifier:
mindat:1:2:10778:6
GUID (UUID V4):
0


A series of diggings and shafts worked from 1839 until the 1850s, with sporadic efforts to reopen the mine until at least the 1950s.
Slightly corrected location coordinates (now the center of the mine complex) using LiDAR and map from Heyl & Pearre (1965).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


10 valid minerals.

Detailed Mineral List:

ⓘ Bornite
Formula: Cu5FeS4
References:
Dana 6:1071.
ⓘ Calcite
Formula: CaCO3
ⓘ Chalcocite
Formula: Cu2S
ⓘ Chalcopyrite
Formula: CuFeS2
References:
Dana 6:1071.
ⓘ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
ⓘ Galena
Formula: PbS
ⓘ 'Limonite'
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
References:
Dana 6:1071.
ⓘ Ottrélite
Formula: Mn2+Al2O(SiO4)(OH)2
References:
Dana 6:1071.
ⓘ Pyrite
Formula: FeS2
ⓘ Sphalerite
Formula: ZnS

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘBornite2.BA.15Cu5FeS4
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘGalena2.CD.10PbS
ⓘPyrite2.EB.05aFeS2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
ⓘOttrélite9.AF.85Mn2+Al2O(SiO4)(OH)2
ⓘChrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Unclassified
ⓘ'Limonite'-

List of minerals for each chemical element

HHydrogen
Hⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ OttréliteMn2+Al2O(SiO4)(OH)2
CCarbon
Cⓘ CalciteCaCO3
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ CalciteCaCO3
Oⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ OttréliteMn2+Al2O(SiO4)(OH)2
AlAluminium
Alⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alⓘ OttréliteMn2+Al2O(SiO4)(OH)2
SiSilicon
Siⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siⓘ OttréliteMn2+Al2O(SiO4)(OH)2
SSulfur
Sⓘ BorniteCu5FeS4
Sⓘ ChalcopyriteCuFeS2
Sⓘ ChalcociteCu2S
Sⓘ GalenaPbS
Sⓘ PyriteFeS2
Sⓘ SphaleriteZnS
CaCalcium
Caⓘ CalciteCaCO3
MnManganese
Mnⓘ OttréliteMn2+Al2O(SiO4)(OH)2
FeIron
Feⓘ BorniteCu5FeS4
Feⓘ ChalcopyriteCuFeS2
Feⓘ PyriteFeS2
CuCopper
Cuⓘ BorniteCu5FeS4
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChalcociteCu2S
Cuⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuⓘ MalachiteCu2(CO3)(OH)2
ZnZinc
Znⓘ SphaleriteZnS
PbLead
Pbⓘ GalenaPbS

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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

Ostrander, Charles W., Price, Jr, Walter E. (1940) Minerals of Maryland. The Natural History Society of Maryland, Baltimore, Maryland, USA. 14pp.
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.
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