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Blackburn Circle locality, Gloucester, Essex County, Massachusetts, USAi
Regional Level Types
Blackburn Circle localityGroup of Construction Sites (Built Over)
GloucesterCity
Essex CountyCounty
MassachusettsState
USACountry

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Latitude & Longitude (WGS84):
42° 37' 32'' North , 70° 39' 44'' West
Latitude & Longitude (decimal):
42.62556,-70.66250
GeoHash:
G#: drtf2p9pu
GRN:
N29W38
Type:
Group of Construction Sites (Built Over) - last checked 2023
KΓΆppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Gloucester29,781 (2017)1.1km
Rockport4,966 (2017)4.8km
Essex1,471 (2017)9.9km
Manchester-by-the-Sea5,366 (2017)10.2km
Ipswich4,222 (2017)15.8km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
North Shore Rock & Mineral Club of MassachusettsSouth Hamilton, Massachusetts18km
Boston Mineral Club, Inc.Boston, Massachusetts44km
Mindat Locality ID:
206529
Long-form identifier:
mindat:1:2:206529:1
GUID (UUID V4):
e726a12d-e2a8-4f70-9907-8a3e5f0cbbee


Temporary exposures in the area during extensive building and road construction adjacent to State Route 128. Minerals were collected from outcrops and boulders of alkalic Cape Ann granite and quartz syenite, and associated pegmatites and miarolitic cavities. The site is now built over.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


23 valid minerals.

Detailed Mineral List:

β“˜ Aegirine
Formula: NaFe3+Si2O6
β“˜ Albite
Formula: Na(AlSi3O8)
β“˜ Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Colour: dark green, black
β“˜ Astrophyllite
Formula: K2NaFe2+7Ti2Si8O26(OH)4F
Colour: golden-brown
β“˜ Danalite
Formula: Be3Fe2+4(SiO4)3S
Colour: red
β“˜ Fluorite
Formula: CaF2
Colour: white, green, purple
Fluorescence: green fluorite fluoresces weakly white (SW)
β“˜ Galena
Formula: PbS
Colour: lead gray
β“˜ Grunerite
Formula: ◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2
Description: Occurs with magnetite as an alteration product of fayalite.
β“˜ Hematite
Formula: Fe2O3
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
Colour: black
Description: Occurs as an alteration product of fayalite.
βœͺ Microcline
Formula: K(AlSi3O8)
Colour: white, pink, green, blue-green
βœͺ Microcline var. Amazonite
Formula: K(AlSi3O8)
Colour: green, blue-green
β“˜ Molybdenite
Formula: MoS2
Colour: metallic gray
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Opal
Formula: SiO2 · nH2O
β“˜ Opal var. Opal-AN
Formula: SiO2 · nH2O
β“˜ Pyrite
Formula: FeS2
β“˜ Quartz
Formula: SiO2
β“˜ Riebeckite
Formula: ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
β“˜ 'Riebeckite Root Name Group'
Formula: ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
Habit: fibrous
Colour: blue
β“˜ 'Riebeckite Root Name Group var. Crocidolite'
Formula: ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
Habit: fibrous
Colour: blue
β“˜ Rutile
Formula: TiO2
β“˜ Rutile var. Ilmenorutile
Formula: (Ti,Nb)O2
β“˜ Siderite
Formula: FeCO3
Description: Most siderite has been altered to goethite.
β“˜ Sphalerite
Formula: ZnS
Colour: brown, black
β“˜ Sulphur
Formula: S8
Colour: yellow
Description: Native sulfur occurs as a rare alteration product of a preexisting mineral, probably sphalerite. Confirmed by SEM-EDS.
β“˜ Thorite
Formula: Th(SiO4)
Colour: reddish
β“˜ Zircon
Formula: Zr(SiO4)
Colour: brown, tan, yellow

Gallery:

Na(AlSi3O8)β“˜ Albite
K2NaFe2+7Ti2Si8O26(OH)4Fβ“˜ Astrophyllite
CaF2β“˜ Fluorite
K(AlSi3O8)β“˜ Microcline var. Amazonite
SiO2 · nH2Oβ“˜ Opal var. Opal-AN
SiO2β“˜ Quartz
◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2β“˜ Riebeckite
Zr(SiO4)β“˜ Zircon

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Sulphur1.CC.05S8
Group 2 - Sulphides and Sulfosalts
β“˜Sphalerite2.CB.05aZnS
β“˜Galena2.CD.10PbS
β“˜Molybdenite2.EA.30MoS2
β“˜Pyrite2.EB.05aFeS2
Group 3 - Halides
β“˜Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜Hematite4.CB.05Fe2O3
β“˜Quartz4.DA.05SiO2
β“˜Opal4.DA.10SiO2 Β· nH2O
β“˜var. Opal-AN4.DA.10SiO2 Β· nH2O
β“˜Rutile
var. Ilmenorutile		4.DB.05(Ti,Nb)O2
β“˜4.DB.05TiO2
Group 5 - Nitrates and Carbonates
β“˜Siderite5.AB.05FeCO3
Group 9 - Silicates
β“˜Zircon9.AD.30Zr(SiO4)
β“˜Thorite9.AD.30Th(SiO4)
β“˜Aegirine9.DA.25NaFe3+Si2O6
β“˜Astrophyllite9.DC.05K2NaFe2+7Ti2Si8O26(OH)4F
β“˜Grunerite9.DE.05β—»{Fe2+2}{Fe2+5}(Si8O22)(OH)2
β“˜Riebeckite9.DE.25β—»[Na2][Fe2+3Fe3+2]Si8O22(OH)2
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Annite9.EC.20KFe2+3(AlSi3O10)(OH)2
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜var. Amazonite9.FA.30K(AlSi3O8)
β“˜Albite9.FA.35Na(AlSi3O8)
β“˜Danalite9.FB.10Be3Fe2+4(SiO4)3S
Unclassified
β“˜'Riebeckite Root Name Group'-β—»[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
β“˜'var. Crocidolite'-β—»[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2

List of minerals for each chemical element

HHydrogen
Hβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Hβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Hβ“˜ Grunerite◻{Fe22+}{Fe52+}(Si8O22)(OH)2
Hβ“˜ Opal var. Opal-ANSiO2 · nH2O
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ OpalSiO2 · nH2O
Hβ“˜ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Hβ“˜ Riebeckite Root Name Group◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Hβ“˜ Riebeckite Root Name Group var. Crocidolite◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
BeBeryllium
Beβ“˜ DanaliteBe3Fe42+(SiO4)3S
CCarbon
Cβ“˜ SideriteFeCO3
OOxygen
Oβ“˜ AegirineNaFe3+Si2O6
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ Microcline var. AmazoniteK(AlSi3O8)
Oβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Oβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Oβ“˜ DanaliteBe3Fe42+(SiO4)3S
Oβ“˜ Grunerite◻{Fe22+}{Fe52+}(Si8O22)(OH)2
Oβ“˜ HematiteFe2O3
Oβ“˜ Opal var. Opal-ANSiO2 · nH2O
Oβ“˜ Rutile var. Ilmenorutile(Ti,Nb)O2
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ OpalSiO2 · nH2O
Oβ“˜ QuartzSiO2
Oβ“˜ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Oβ“˜ RutileTiO2
Oβ“˜ SideriteFeCO3
Oβ“˜ ThoriteTh(SiO4)
Oβ“˜ ZirconZr(SiO4)
Oβ“˜ Riebeckite Root Name Group◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Oβ“˜ Riebeckite Root Name Group var. Crocidolite◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
FFluorine
Fβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Fβ“˜ FluoriteCaF2
Fβ“˜ Riebeckite Root Name Group◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Fβ“˜ Riebeckite Root Name Group var. Crocidolite◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
NaSodium
Naβ“˜ AegirineNaFe3+Si2O6
Naβ“˜ AlbiteNa(AlSi3O8)
Naβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Naβ“˜ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Naβ“˜ Riebeckite Root Name Group◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Naβ“˜ Riebeckite Root Name Group var. Crocidolite◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
AlAluminium
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ Microcline var. AmazoniteK(AlSi3O8)
Alβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Siβ“˜ AegirineNaFe3+Si2O6
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ Microcline var. AmazoniteK(AlSi3O8)
Siβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Siβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Siβ“˜ DanaliteBe3Fe42+(SiO4)3S
Siβ“˜ Grunerite◻{Fe22+}{Fe52+}(Si8O22)(OH)2
Siβ“˜ Opal var. Opal-ANSiO2 · nH2O
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ OpalSiO2 · nH2O
Siβ“˜ QuartzSiO2
Siβ“˜ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Siβ“˜ ThoriteTh(SiO4)
Siβ“˜ ZirconZr(SiO4)
Siβ“˜ Riebeckite Root Name Group◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Siβ“˜ Riebeckite Root Name Group var. Crocidolite◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
SSulfur
Sβ“˜ DanaliteBe3Fe42+(SiO4)3S
Sβ“˜ GalenaPbS
Sβ“˜ MolybdeniteMoS2
Sβ“˜ PyriteFeS2
Sβ“˜ SphaleriteZnS
Sβ“˜ SulphurS8
ClChlorine
Clβ“˜ Riebeckite Root Name Group◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Clβ“˜ Riebeckite Root Name Group var. Crocidolite◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
KPotassium
Kβ“˜ Microcline var. AmazoniteK(AlSi3O8)
Kβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Kβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caβ“˜ FluoriteCaF2
TiTitanium
Tiβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Tiβ“˜ Rutile var. Ilmenorutile(Ti,Nb)O2
Tiβ“˜ RutileTiO2
FeIron
Feβ“˜ AegirineNaFe3+Si2O6
Feβ“˜ AnniteKFe32+(AlSi3O10)(OH)2
Feβ“˜ AstrophylliteK2NaFe72+Ti2Si8O26(OH)4F
Feβ“˜ DanaliteBe3Fe42+(SiO4)3S
Feβ“˜ Grunerite◻{Fe22+}{Fe52+}(Si8O22)(OH)2
Feβ“˜ HematiteFe2O3
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ PyriteFeS2
Feβ“˜ Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Feβ“˜ SideriteFeCO3
Feβ“˜ Riebeckite Root Name Group◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Feβ“˜ Riebeckite Root Name Group var. Crocidolite◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
ZnZinc
Znβ“˜ SphaleriteZnS
ZrZirconium
Zrβ“˜ ZirconZr(SiO4)
NbNiobium
Nbβ“˜ Rutile var. Ilmenorutile(Ti,Nb)O2
MoMolybdenum
Moβ“˜ MolybdeniteMoS2
PbLead
Pbβ“˜ GalenaPbS
ThThorium
Thβ“˜ ThoriteTh(SiO4)

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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

Cristofono, P. (2010). Minerals of the Blackburn Circle Area, Gloucester, Massachusetts (Micromounters of New England Newsletter no. 304, pp.4-13, May 2010).
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