Vote for your favorite mineral in #MinCup26! - Monazite-(Ce) vs. Andalusite
It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Southern Pit, Hollofield Gabbro Quarries, Hollofield, Baltimore County, Maryland, USAi
Regional Level Types
Southern PitGroup of Quarries (Abandoned)
Hollofield Gabbro QuarriesGroup of Quarries (Overgrown)
HollofieldUnincorporated Area
Baltimore CountyCounty
MarylandState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearchMineralogy
Latitude & Longitude (WGS84):
39° 18' 34'' North , 76° 47' 30'' West
Latitude & Longitude (decimal):
39.30964,-76.79193
GRN:
N27W43
Type:
Group of Quarries (Abandoned) - last checked 2023
Köppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Milford Mill29,042 (2011)4.7km
Ellicott City65,834 (2011)4.7km
Woodlawn37,879 (2011)5.7km
Randallstown32,430 (2011)6.4km
Catonsville41,567 (2011)6.6km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Central Maryland Rock and Mineral Collectors ExchangeElkridge, Maryland13km
Baltimore Mineral SocietyBaltimore, Maryland16km
Chesapeake Gem & Mineral SocietyBaltimore, Maryland16km
Gem Cutters Guild of Baltimore, Inc.Baltimore, Maryland16km
Gem, Lapidary, and Mineral Society of Montgomery County, MD., Inc.Rockville, Maryland40km
Mindat Locality ID:
142902
Long-form identifier:
mindat:1:2:142902:5
GUID (UUID V4):
0


The former Hollofield quarry is the largest and oldest of two quarries in the area.

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


7 valid minerals.

Detailed Mineral List:

ⓘ Aragonite
Formula: CaCO3
ⓘ Calcite
Formula: CaCO3
ⓘ 'Chlorite Group'
ⓘ Enstatite
Formula: Mg2Si2O6
ⓘ Enstatite var. Bronzite
Formula: (Mg,Fe2+)2[SiO3]2
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Laumontite
Formula: CaAl2Si4O12 · 4H2O
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Vermiculite
Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAragonite5.AB.15CaCO3
Group 9 - Silicates
ⓘEnstatite9.DA.05Mg2Si2O6
ⓘvar. Bronzite9.DA.05(Mg,Fe2+)2[SiO3]2
ⓘVermiculite9.EC.50Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
ⓘLaumontite9.GB.10CaAl2Si4O12 · 4H2O
Unclassified
ⓘ'Chlorite Group'-
ⓘ'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hⓘ LaumontiteCaAl2Si4O12 · 4H2O
Hⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
CCarbon
Cⓘ AragoniteCaCO3
Cⓘ CalciteCaCO3
OOxygen
Oⓘ AragoniteCaCO3
Oⓘ CalciteCaCO3
Oⓘ EnstatiteMg2Si2O6
Oⓘ LaumontiteCaAl2Si4O12 · 4H2O
Oⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Oⓘ Enstatite var. Bronzite(Mg,Fe2+)2[SiO3]2
Oⓘ Garnet GroupX3Z2(SiO4)3
MgMagnesium
Mgⓘ EnstatiteMg2Si2O6
Mgⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Mgⓘ Enstatite var. Bronzite(Mg,Fe2+)2[SiO3]2
AlAluminium
Alⓘ LaumontiteCaAl2Si4O12 · 4H2O
Alⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
SiSilicon
Siⓘ EnstatiteMg2Si2O6
Siⓘ LaumontiteCaAl2Si4O12 · 4H2O
Siⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Siⓘ Enstatite var. Bronzite(Mg,Fe2+)2[SiO3]2
Siⓘ Garnet GroupX3Z2(SiO4)3
SSulfur
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
CaCalcium
Caⓘ AragoniteCaCO3
Caⓘ CalciteCaCO3
Caⓘ LaumontiteCaAl2Si4O12 · 4H2O
FeIron
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
Feⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Feⓘ Enstatite var. Bronzite(Mg,Fe2+)2[SiO3]2

Other Databases

Link to USGS MRDS:10145682

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

Singewald, J.T. (1928) Notes on feldspar, quartz, chrome and manganese in Maryland: Maryland Geological Survey vol. 12 part 2: 112.
Ostrander, Charles W., Price, Jr, Walter E. (1940) Minerals of Maryland. The Natural History Society of Maryland, Baltimore, Maryland, USA. 14pp.
Pearre, Nancy (1961) Mineral deposits of Maryland excluding fuel, sand and gravel: U.S. Geological Survey Mineral Investigations Resources Map MR-12.
Quick NavTopCommoditiesMineral ListOther DatabasesOther RegionsReferences
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 7, 2026 04:17:57 Page updated: July 24, 2026 16:26:08
Go to top of page