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Old Mine Plaza construction site, Trumbull, Fairfield Co., Connecticut, USA

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Well-known construction site locality close to the Old Mine Park (Hubbard) Tungsten Mine. Excellent specimens of fluorescent scheelite are found here as well as occasional topaz, fluorite var. chlorophane and excellent beryl crystals in calcite pods in schist. Heitner (1998) indicates the material recovered was beryl, with no mention of emerald. The report of true emerald from this locality remains controversial and any trace quantities of chromium or other coloring agents that might or might not exist in beryl from this locality do not yield true emerald color at this locality, although some unanalyzed beryls from this locality have a peculiar greenish yellow tinge.

Ref.(in part): Heitner, H., Window of Opportunity, Field Collecting at Trumbull, Connecticut, Rocks & Minerals, May-June, p. 198, 1998.




Group 2 - Sulphides and Sulfosalts
  		• Bornite ?2.BA.15
    Cu
     
    5
    		FeS
     
    4
  		• Chalcopyrite2.CB.10a
    CuFeS
     
    2
  		• Marcasite2.EB.10a
    FeS
     
    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)
  		• Sphalerite2.CB.05a
    (Zn,Fe
    2+
     
    		)S
  		• Tungstenite2.EA.30
    WS
     
    2
    Group 3 - Halides
  		• Fluorite3.AB.25
    CaF
     
    2
    Group 4 - Oxides and Hydroxides
  		• Cuprite4.AA.10
    Cu
     
    2
    		O
  		• Ferberite ?4.DB.30
    FeWO
     
    4
  		• Hydrotungstite ?4.FJ.15
    WO
     
    3
    		·2H
     
    2
    		O
  		• Hübnerite4.DB.30
    MnWO
     
    4
  		• Lepidocrocite ?4.FE.15
    γ-Fe
    3+
     
    		O(OH)
  		• Magnetite4.BB.05
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Opal
    var: Opal-AN    		4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
  		• Pyrolusite ?4.DB.05
    MnO
     
    2
  		• Quartz4.DA.05
    SiO
     
    2
  		• Tungstite4.FJ.10
    WO
     
    3
    		·H
     
    2
    		O
    Group 5 - Nitrates and Carbonates
  		• Azurite5.BA.05
    Cu
     
    3
    		[OH|CO
     
    3
    		]
     
    2
  		• Calcite5.AB.05
    CaCO
     
    3
  		• Malachite5.BA.10
    Cu
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
  		• Siderite5.AB.05
    FeCO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Epsomite ?7.CB.40
    MgSO
     
    4
    		·7H
     
    2
    		O
  		• Gypsum7.CD.40
    Ca[SO
     
    4
    		] · 2H
     
    2
    		O
  		• Melanterite7.CB.35
    FeSO
     
    4
    		·7H
     
    2
    		O
  		• Pickeringite7.CB.85
    MgAl
     
    2
    		(SO
     
    4
    		)
     
    4
    		·22H
     
    2
    		O
  		• Rozenite7.CB.15
    FeSO
     
    4
    		·4H
     
    2
    		O
  		• Scheelite7.GA.05
    Ca[WO
     
    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
    		]
  		• Almandine9.AD.25
    Fe
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
  		• Axinite-(Fe)9.BD.20
    Ca
     
    2
    		Fe
    2+
     
    		Al
     
    2
    		[OH|BSi
     
    4
    		O
     
    15
    		]
  		• Bavenite9.DF.25
    Ca
     
    4
    		Be
     
    2
    		Al
     
    2
    		Si
     
    9
    		O
     
    26
    		(OH)
     
    2
  		• Beryl9.CJ.05
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
      var: Emerald ?9.CJ.05
    Be
     
    3
    		Al
     
    2
    		Si
     
    6
    		O
     
    18
  		• 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
    		]
  		• 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
  		• Hedenbergite ?9.DA.15
    CaFe
    2+
     
    		[Si
     
    2
    		O
     
    6
    		]
  		• Margarite ?9.EC.30
    CaAl
     
    2
    		[(OH)
     
    2
    		|Al
     
    2
    		Si
     
    2
    		O
     
    10
    		]
  		• Microcline9.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
    		]
  		• Schorl9.CK.05
    [Na][Fe
    2+
    3
    		][Al
     
    6
    		][(OH)
     
    3
    		|OH|(BO
     
    3
    		)
     
    3
    		|Si
     
    6
    		O
     
    18
    		]
  		• Sillimanite9.AF.05
    Al
     
    2
    		[O|SiO
     
    4
    		]
  		• Stilbite-Ca9.GE.10
    NaCa
     
    4
    		[Al
     
    9
    		Si
     
    27
    		O
     
    72
    		] · nH
     
    2
    		O
  		• Topaz9.AF.35
    Al
     
    2
    		[(F,OH)
     
    2
    		|SiO
     
    4
    		]
  		• Tremolite9.DE.10
    ☐[Ca
     
    2
    		][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Zircon9.AD.30
    Zr[SiO
     
    4
    		]
    Unclassified Minerals
  		• 'Hornblende'-
  		• Limonite-
    FeO(OH)·nH
     
    2
    		O
  		• 'Margarodite'-
  		• 'Scapolite'-
  		• 'Tourmaline'-
  		• Wolframite-
    (Fe
    2+
     
    		)WO
     
    4
     
     
    		to (Mn
    2+
     
    		)WO
     
    4


    57 entries listed. 51 valid minerals. 2 erroneous literature entries.

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