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Montgomery Co., Maryland, USA

StandardDetailedBy ChemistryMineral Photos (35)Site Photos (1)Search GoogleMineral Report for Region

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

Group 1 - Elements
  		• Copper1.AA.05
    Cu
  		• Gold1.AA.05
    Au
  		• Palladium ?1.AF.10
    (Pd,Pt)
  		• Platinum ?1.AF.10
    Pt
    Group 2 - Sulphides and Sulfosalts
  		• Bornite2.BA.15
    Cu
     
    5
    		FeS
     
    4
  		• Chalcocite2.BA.05
    Cu
     
    2
    		S
  		• Chalcopyrite2.CB.10a
    CuFeS
     
    2
  		• Galena2.CD.10
    PbS
  		• Millerite2.CC.20
    NiS
  		• Molybdenite2.EA.30
    MoS
     
    2
  		• Pentlandite2.BB.15
    (Fe,Ni)
     
    9
    		S
     
    8
  		• Pyrite2.EB.05a
    FeS
     
    2
  		• Pyrrhotite2.CC.10
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
  		• Sphalerite2.CB.05a
    (Zn,Fe
    2+
     
    		)S
  		• Tetradymite2.DC.05
    Bi
     
    2
    		Te
     
    2
    		S
  		• Tochilinite2.FD.35
    Fe
    2+
    5-6
    		(Mg,Fe
    2+
     
    		)
     
    5
    		[(OH)
     
    10
    		|S
     
    6
    		]
    Group 4 - Oxides and Hydroxides
  		• Brucite4.FE.05
    Mg(OH)
     
    2
  		• Chromite4.BB.05
    FeCr
     
    2
    		O
     
    4
  		• Cuprite ?4.AA.10
    Cu
     
    2
    		O
  		• Gahnite4.BB.05
    ZnAl
     
    2
    		O
     
    4
  		• Goethite4.FD.10
    α-Fe
    3+
     
    		O(OH)
  		• Hematite4.CB.05
    Fe
     
    2
    		O
     
    3
      var: Specularite4.CB.05
    Fe
     
    2
    		O
     
    3
  		• Ilmenite4.CB.05
    Fe
    2+
     
    		TiO
     
    3
  		• Magnesiochromite4.BB.05
    MgCr
     
    2
    		O
     
    4
  		• Magnetite4.BB.05
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Microlite ?4.DH.15
    (Ca,Na)
     
    2
    		Ta
     
    2
    		O
     
    6
    		(O,OH,F)
  		• Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
  		• Pyrochlore ?4.DH.15
    (Ca,Na)
     
    2
    		Nb
     
    2
    		O
     
    6
    		(OH,F)
  		• Pyrolusite4.DB.05
    MnO
     
    2
  		• Quartz4.DA.05
    SiO
     
    2
  		• Rutile4.DB.05
    TiO
     
    2
    Group 5 - Nitrates and Carbonates
  		• Ankerite5.AB.10
    Ca(Fe
    2+
     
    		 ,Mg,Mn
    2+
     
    		)(CO
     
    3
    		)
     
    2
  		• Aragonite5.AB.15
    CaCO
     
    3
  		• Azurite5.BA.05
    Cu
     
    3
    		[OH|CO
     
    3
    		]
     
    2
  		• Calcite5.AB.05
    CaCO
     
    3
  		• Coalingite5.DA.55
    Mg
     
    10
    		Fe
    3+
    2
    		[(OH)
     
    24
    		|CO
     
    3
    		] · 2H
     
    2
    		O
  		• Desautelsite5.DA.50
    Mg
     
    6
    		Mn
    3+
    2
    		[(OH)
     
    16
    		|CO
     
    3
    		] · 4H
     
    2
    		O
  		• Dolomite5.AB.10
    CaMg(CO
     
    3
    		)
     
    2
  		• Huntite5.AB.25
    CaMg
     
    3
    		(CO
     
    3
    		)
     
    4
  		• Hydromagnesite5.DA.05
    Mg
     
    5
    		[(CO
     
    3
    		)
     
    4
    		(OH)
     
    2
    		] · 4H
     
    2
    		O
  		• Magnesite5.AB.05
    MgCO
     
    3
  		• Malachite5.BA.10
    Cu
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
  		• Mcguinnessite5.BA.10
    (Mg,Cu)
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
  		• Pokrovskite5.BA.10
    Mg
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
  		• Siderite5.AB.05
    FeCO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Brochantite7.BB.25
    Cu
     
    4
    		[(OH)
     
    6
    		|SO
     
    4
    		]
    Group 8 - Phosphates, Arsenates and Vanadates
  		• Apatite-(CaF)8.BN.05
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
  		• Autunite8.EB.05
    Ca(UO
     
    2
    		)
     
    2
    		(PO
     
    4
    		)
     
    2
    		·11H
     
    2
    		O
    Group 9 - Silicates
  		• Actinolite9.DE.10
    ☐Ca
     
    2
    		(Mg,Fe
    2+
     
    		)
     
    5
    		(Si
     
    8
    		O
     
    22
    		)(OH)
     
    2
  		• Albite9.FA.35
    Na[AlSi
     
    3
    		O
     
    8
    		]
  		• Almandine9.AD.25
    Fe
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
  		• Anthophyllite9.DE.05
    ☐[Mg
     
    2
    		][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Antigorite9.ED.15
    (Mg,Fe
    2+
     
    		)
     
    3
    		[(OH)
     
    4
    		|Si
     
    2
    		O
     
    5
    		]
  		• Bertrandite9.BD.05
    Be
     
    4
    		[(OH)
     
    2
    		|Si
     
    2
    		O
     
    7
    		]
  		• Beryl9.CJ.05
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
      var: Heliodor9.CJ.05
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
  		• Biotite ?9..
  		• Chrysocolla ?9.ED.20
    (Cu,Al)
     
    2
    		H
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    		·nH
     
    2
    		O
  		• Chrysotile9.ED.15
    Mg
     
    3
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
  		• Clinochlore9.EC.55
    (Mg,Fe
    2+
     
    		)
     
    5
    		Al[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Clinozoisite9.BG.05
    {Ca
     
    2
    		}{Al
     
    3
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Diopside9.DA.15
    CaMg[Si
     
    2
    		O
     
    6
    		]
      var: Chromian Diopside9.DA.15
    (Ca,Cr)MgSi
     
    2
    		O
     
    6
  		• Dravite9.CK.05
    [Na][Mg
     
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
  		• Epidote9.BG.05
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
  		• Grossular9.AD.25
    Ca
     
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
  		• Lizardite9.ED.15
    Mg
     
    3
    		[(OH)
     
    4
    		|Si
     
    2
    		O
     
    5
    		]
  		• Microcline9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Muscovite9.EC.15
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Nimite9.EC.55
    (Ni,Mg,Al)
     
    6
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    8
  		• Omphacite9.DA.20
    (Ca,Na)(Mg,Al)[Si
     
    2
    		O
     
    6
    		]
  		• Orthoclase9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Pargasite9.DE.15
    [Na][Ca
     
    2
    		][Mg
     
    4
    		Al][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
  		• Prehnite9.DP.20
    Ca
     
    2
    		Al
     
    2
    		Si
     
    3
    		O
     
    12
    		(OH)
  		• Schorl9.CK.05
    [Na][Fe
    2+
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
  		• Spessartine9.AD.25
    Mn
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
  		• Staurolite9.AF.30
    (Fe
    2+
     
    		,Mg,Zn)
     
    1.5-2
    		Al
     
    9
    		[O
     
    6
    		|(OH,O)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
  		• Talc9.EC.05
    Mg
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
  		• Titanite9.AG.15
    CaTi[O|SiO
     
    4
    		]
  		• Tremolite9.DE.10
    ☐[Ca
     
    2
    		][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Vesuvianite9.BG.35
    Ca
     
    10
    		(Mg,Fe)
     
    2
    		Al
     
    4
    		Si
     
    9
    		O
     
    34
    		(OH)
     
    4
  		• Xonotlite9.DG.35
    Ca
     
    6
    		Si
     
    6
    		O
     
    17
    		(OH)
     
    2
  		• Zinnwaldite ?9.EC.20
    KLiFe
    2+
     
    		Al[(F,OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Zoisite9.BG.10
    {Ca
     
    2
    		}{Al
     
    3
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
      var: Thulite9.BG.10
    {Ca
     
    2
    		}{Al
     
    3
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Unclassified Minerals
  		• 'Albite-Anorthite Series'-
  		• 'Chalcedony'-
  		• 'Chlorite Group'-
  		• 'Deweylite'-
    Mg
     
    4
    		Si
     
    3
    		O
     
    10
    		·6H
     
    2
    		O ?
  		• 'Hydrogrossular'-
  		• Limonite-
    FeO(OH)·nH
     
    2
    		O
  		• 'Manganese Oxides
    var: Manganese Dendrites'    		-
  		• 'Olivine'-
    (Mg,Fe
    2+
     
    		)
     
    2
    		[SiO
     
    4
    		]
  		• 'Serpentine Group'-
    D
     
    2
    		[Si
     
    2
    		O
     
    5
    		](OH)4 + or - nH
     
    2
    		O
  		• 'Tourmaline'-
    AD
     
    3
    		G
     
    6
    		(BO
     
    3
    		)
     
    3
    		[T
     
    6
    		O
     
    18
    		]Y
     
    3
    		Z


    96 entries listed. 84 valid minerals.

    Localities in this Region:
    USA
     
    • Maryland
      • Montgomery Co.
        • Barnesville
        • Boyds
        • Cropley
        • Ednor
        • Garrett Park
        • Kensington
        • Silver Spring

    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!
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Maryland, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 14th Nov 2009 08:22:50