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Rockport, Essex Co., Massachusetts, USA

StandardDetailedBy ChemistryMineral Photos (9)Site Photos (8)Search GoogleMineral Report for Region

Area granite quarries and other bedrock exposures of alkaline Cape Ann granite and associated pegmatites and miarolitic cavities. Granite was quarried in Rockport beginning in 1823.



References:
Cooke, Josiah P., Jr. (1866): On Danalite, a new Mineral Species from the Granite of Rockport, Mass. (American Journal of Science and Arts 47:73-78).

Cooke, Josiah P., Jr. (1867): On Cryophyllite. (American Journal of Science and Arts 48:217).

Merrill, George P. (1889): The Collection of Building and Ornamental Stones in the U.S. National Museum, p. 287.

Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County.

McKinstry, H. E. (1921): The Minerals of Rockport, Massachusetts (American Mineralogist 6:56-60).

Palache, Charles (1950): Fayalite at Rockport, Massachusetts. (American Mineralogist 35:877-881).

Dunn, P. (1976): Genthelvite and the helvine group (Mineralogical Magazine 40:627-636).

Lyons, Paul (1976): The Chemistry of Riebeckites of Massachusetts (Mineralogical Magazine 4:473-9).

Bozhilov, K. N. & B. W. Evans (2001): Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study. (American Mineralogist 86(10):1252-1260).




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

Group 2 - Sulphides and Sulfosalts
  		• Galena2.CD.10
    PbS
  		• Molybdenite2.EA.30
    MoS
     
    2
  		• Pyrite2.EB.05a
    FeS
     
    2
  		• Pyrrhotite2.CC.10
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Group 3 - Halides
  		• Fluorite3.AB.25
    CaF
     
    2
    Group 4 - Oxides and Hydroxides
  		• Hematite4.CB.05
    Fe
     
    2
    		O
     
    3
  		• Ilmenite4.CB.05
    Fe
    2+
     
    		TiO
     
    3
  		• Magnetite4.BB.05
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Quartz4.DA.05
    SiO
     
    2
      var: Blue Quartz4.DA.05
    SiO
     
    2
      var: Citrine4.DA.05
    SiO
     
    2
      var: Rock Crystal4.DA.05
    SiO
     
    2
      var: Smoky Quartz4.DA.05
    SiO
     
    2
  		• Zirconolite
    var: Polymignite    		4.DH.30
    (Ca,Fe,Y,Th)(Nb,Ti,Ta,Zr)O
     
    4
    Group 5 - Nitrates and Carbonates
  		• Calcite5.AB.05
    CaCO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Fergusonite-(Y)7.GA.05
    YNbO
     
    4
    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
    		]
  		• Annite (TL)9.EC.20
    KFe
    2+
    3
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Astrophyllite ?9.DC.05
    (K,Na)
     
    3
    		(Fe,Mn)
     
    7
    		Ti
     
    2
    		Si
     
    8
    		O
     
    24
    		(O,OH)
     
    7
  		• Biotite9..
  		• Danalite (TL)9.FB.10
    Fe
    2+
    4
    		Be
     
    3
    		[S|(SiO
     
    4
    		)
     
    3
    		]
  		• Fayalite9.AC.05
    Fe
    2+
    2
    		[SiO
     
    4
    		]
  		• Ferro-anthophyllite9.DD.05
    ☐[Fe
    2+
    2
    		][Fe
    2+
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Genthelvite9.FB.10
    Zn
     
    4
    		Be
     
    3
    		[S|(SiO
     
    4
    		)
     
    3
    		]
  		• Grunerite9.DE.05
    [ ][Fe
    2+
    2
    		][Fe
    2+
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Hastingsite9.DE.15
    [Na][Ca
     
    2
    		][Fe
    2+
    4
    		Fe
    3+
     
    		][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
  		• Hedenbergite9.DA.15
    CaFe
    2+
     
    		[Si
     
    2
    		O
     
    6
    		]
  		• Microcline9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
      var: Amazonite9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Muscovite9.EC.15
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Orthoclase9.FA.30
    K[AlSi
     
    3
    		O
     
    8
    		]
  		• Thorite9.AD.30
    (Th,U)[SiO
     
    4
    		]
      var: Orangite9.AD.30
    (Th,U)[SiO
     
    4
    		]
  		• Zircon9.AD.30
    Zr[SiO
     
    4
    		]
      var: Cyrtolite9.AD.30
    Zr[(SiO
     
    4
    		),(OH)
     
    4
    		]
    Unclassified Minerals
  		• 'Allanite'-
  		• 'Chlorite Group'-
  		• Cryophyllite-
  		• 'Fergusonite'-
  		• 'Lepidomelane'-
  		• Tantalite-
    (Fe,Mn)(Ta,Nb)
     
    2
    		O
     
    6
  		• 'Yttrocerite'-
    CaF
     
    2
    		 + (Y,Ce)F
     
    3


    43 entries listed. 35 valid minerals.

    Localities in this Region:
    USA
     
    • Massachusetts
      • Essex Co.
        • Rockport

    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 Massachusetts, 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: 2nd Nov 2009 00:23:33