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Maryland, USA

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 39° North , 76° West (est.)
Margin of Error:~74km


One of the thirteen original states of the USA.

Maryland's geological diversity is impressive for such a small state and can serve as a cross-section for Appalachian geology. Going from west to east, the state contains a portion of the Allegheny Plateau in Garrett County, the folded Valley and Ridge Province, the Blue Ridge just west of Frederick, a Triassic-Jurassic Fault basin, Piedmont Plateau igneous and metamorphic rocks and the Cretaceous to Quaternary Coastal Plain province. Estuarine and coastal landforms also are well developed along the Chesapeake Bay and Atlantic coastline.

Some of the state's more notable mineral collecting localities are as follows. Many interesting minerals are found in the state's ultramafic rocks such as those exposed in the Hunting Hill Quarry in Montgomery County, the Bare Hills in Baltimore County and numerous pits worked for chromite, talc and verde antique in Harford and Cecil Counties. Several interesting old copper mine districts occur in Baltimore, Carroll and Frederick Counties, including the type locality for carrollite. Gold deposits near Great Falls in Montgomery County have fueled several small gold rushes. The Cambrian Cockeysville marble furnishes interesting collecting in quarries in Baltimore and Howard Counties. The Piedmont Plateau rocks contain collectable metamorphic minerals such as garnet, staurolite and kyanite. Selenite gypsum crystal clusters, iron phosphates (vivianite mainly) nodules have been found in the Coastal Plain province in Prince Georges and other Counties.

The urban to suburban nature of the state means that old deposits are frequently obscured or obliterated by development. However the diverse geology renders of interest any new exposure, even if only temporarily available for collecting and study.

Mineral List

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

Actinolite

Albite

var: Oligoclase

'Albite-Anorthite Series'

'Allanite Group'

Almandine

'Almandine-Spessartine Series'

'Alum Group'

'Amber'

'Amphibole Supergroup'

'var: Byssolite'

Analcime

Anglesite

Anhydrite

Ankerite

Anthophyllite

Antigorite

var: Williamsite

'Apatite'

'Apophyllite'

Aragonite

Arfvedsonite

Arsenopyrite

'Asbestos'

'var: Mountain Leather'

Augite

Aurichalcite

Autunite

Awaruite

Azovskite

Azurite

Baryte

Beidellite

Bertrandite

Beryl

var: Aquamarine

var: Heliodor

'Biotite'

Birnessite

Bornite

Brochantite

Brucite

Cacoxenite

'Calamine'

Calcite

var: Iceland Spar

var: Manganoan Calcite

Carrollite (TL)

Cerussite

'Chabazite'

Chabazite-Ca

var: Haydenite (FRL)

Chalcanthite

Chalcocite

Chalcopyrite

'Chlorite Group'

Chromite

Chrysocolla

Chrysotile

'Clays'

Clinochlore

var: Chromian Clinochlore

var: Ripidolite

Clinoenstatite

'Clinopyroxene Subgroup'

Clinozoisite

Coalingite

'Columbite'

'Columbite-(Fe)-Columbite-(Mn) Series'

Copiapite

Copper

Corundum

Covellite

Cummingtonite

Cuprite

var: Chalcotrichite

Desautelsite

'Deweylite'

Dickite

Diopside

var: Chromian Diopside

Dolomite

Dravite

var: Chromian Dravite

Enstatite

var: Bronzite

Epidote

'Fairbanksite'

'Feldspar Group'

Felsőbányaite

Ferro-hornblende

Fluorapatite

Fluorite

Forsterite

Gahnite

Galena

'Garnet'

'Garnierite'

'Glass'

Glauconite

Goethite

Gold

var: Electrum

Graphite

Grossular

'Grossular-Hibschite Series'

Gypsum

var: Selenite

'Halloysite'

Harmotome

Heazlewoodite

Hematite

var: Specularite

Hemimorphite

'Heulandite'

Heulandite-Ca

var: Beaumontite (of Lévy) (FRL)

Hollandite

'Hornblende'

Huntite

Hydromagnesite

Hydrozincite

Idaite

Ilmenite

Iron

var: Kamacite

Jarosite

Kaolinite

'K Feldspar'

'var: Adularia'

Kyanite

Laumontite

'Limonite'

Linnaeite

Lipscombite

Lizardite

Mackinawite

Magnesiochromite

Magnesio-hornblende

Magnesite

var: Breunnerite

Magnetite

Malachite

'Manganese Oxides'

'var: Manganese Dendrites'

Marcasite

Margarite

Maucherite

Mcguinnessite

Melanterite

'Mica Group'

Microcline

Millerite

Molybdenite

Muscovite

var: Fuchsite

var: Sericite

Natrolite

Nimite

Nontronite

'Ochre'

'Olivine'

Omphacite

Opal

var: Opal-AN

Orthoclase

Ottrélite

Pargasite

Pentlandite

'Petrified Wood'

'Phillipsite'

Phlogopite

Phosphosiderite

Pokrovskite

Prehnite

Pseudomalachite

'Psilomelane'

Pyrite

Pyroaurite

Pyrolusite

Pyrophyllite

'Pyroxene Group'

Pyrrhotite

Quartz

var: Amethyst

var: Blue Quartz

var: Chalcedony

var: Milky Quartz

var: Moss Agate

var: Rock Crystal

var: Rutilated Quartz

var: Smoky Quartz

'Remingtonite' (FRL)

Riebeckite

Rockbridgeite

Romanèchite

Rosasite

Rutile

'Scapolite'

'var: Wernerite'

Schorl

Scolecite

'Serpentine Subgroup'

'var: Marmolite'

'var: Picrolite'

Siderite

var: Sphärosiderite

Siegenite

Sillimanite

Silver

Smithsonite

Spessartine

Sphalerite

Spinel

Staurolite

Stibnite

'Stilbite'

Strontianite

Sulphur

Taenite

Talc

'Tantalite'

Tenorite

Tetradymite

Tetrahedrite

Titanite

Tochilinite

Todorokite

Torbernite

'Tourmaline'

Tremolite

Troilite

Uraninite

Vermiculite

Vesuvianite

Violarite

Vivianite

'Wad'

Wollastonite

Wulfenite

Xonotlite

Zaratite

Zircon

Zoisite

var: Thulite


162 valid minerals. 1 (TL) - type locality of valid minerals. 3 (FRL) - first recorded locality of unapproved mineral/variety/etc.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

Note: this is a very new system on mindat.org 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


Localities in this Region


The above list 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, C. W. & W. E. Price Jr. (1940) Minerals of Maryland: Natural History Society of Maryland, 92 p.

Pearre, N. & A. V. Heyl (1960) Mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware: U. S. Geological Survey: Bulletin 1082K: 707-833.

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.

Vokes, H. E., revised by J. Edwards (1974) Geography and Geology of Maryland: Maryland Geological Survey Bulletin 19, 242 p.

Bernstein, Lawrence (1976) Minerals of Washington D.C. and vicinity: U.S. Geological Survey: Open File Report 76-849, 183 p.

Bernstein, Lawrence (1980) Minerals of the Washington D. C. area: Maryland Geological Survey Educational Series 5, 148 p.

Schmidt, M.F. & M. F. Schmidt Jr. (2010) Maryland's Geology: Schiffer Publications, 164 p.

Means, J. (2010) Roadside geology of Maryland, Delaware and Washington, D.C.: Mountain Press Publishers, 346 p.

External Links


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