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Flat Rock Tunnel, Lower Merion Township, Montgomery Co., Pennsylvania, USAi
Regional Level Types
Flat Rock TunnelTunnel
Lower Merion TownshipTownship
Montgomery Co.County
PennsylvaniaState
USACountry

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Latitude & Longitude (WGS84):
40° North , 75° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~2km
Locality type:
Köppen climate type:


About 1 mile NW of West Manayunk railroad station. Most of the minerals were observed when the tunnel was constructed

Wissahickon gneiss and pegmatite

Ref.: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


10 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Beryl
Formula: Be3Al2(Si6O18)
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Calcite
Formula: CaCO3
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Chabazite-Ca
Formula: (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Description: not analyzed, assumed to be Ca dominant
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Heulandite-Ca
Formula: (Ca,Na)5(Si27Al9)O72 · 26H2O
Description: not analyzed, assumed to be Ca dominant
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Ilmenite
Formula: Fe2+TiO3
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Microcline
Formula: K(AlSi3O8)
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.
Stilbite-Ca
Formula: NaCa4[Al9Si27O72] · nH2O
Description: not analyzed, assumed to be Ca dominant
Reference: Gordon, S.G. (1922) "The Mineralogy of Pennsylvania," Special Publication No. 1, The Academy of Natural Sciences of Philadelphia: p. 213.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Ilmenite4.CB.05Fe2+TiO3
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Almandine9.AD.25Fe2+3Al2(SiO4)3
Beryl9.CJ.05Be3Al2(Si6O18)
Chabazite-Ca9.GD.10(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Heulandite-Ca9.GE.05(Ca,Na)5(Si27Al9)O72 · 26H2O
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Stilbite-Ca9.GE.10NaCa4[Al9Si27O72] · nH2O
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Chabazite-Ca77.1.2.1(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Heulandite-Ca77.1.4.1(Ca,Na)5(Si27Al9)O72 · 26H2O
Stilbite-Ca77.1.4.3NaCa4[Al9Si27O72] · nH2O
Unclassified Minerals, Mixtures, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals for each chemical element

HHydrogen
H ApatiteCa5(PO4)3(Cl/F/OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
H Stilbite-CaNaCa4[Al9Si27O72] · nH2O
H Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
BeBeryllium
Be BerylBe3Al2(Si6O18)
CCarbon
C CalciteCaCO3
OOxygen
O MicroclineK(AlSi3O8)
O AlbiteNa(AlSi3O8)
O AlmandineFe32+Al2(SiO4)3
O BerylBe3Al2(Si6O18)
O ApatiteCa5(PO4)3(Cl/F/OH)
O MuscoviteKAl2(AlSi3O10)(OH)2
O IlmeniteFe2+TiO3
O CalciteCaCO3
O Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
O Stilbite-CaNaCa4[Al9Si27O72] · nH2O
O Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
FFluorine
F ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Na AlbiteNa(AlSi3O8)
Na Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Na Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Na Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
AlAluminium
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al BerylBe3Al2(Si6O18)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Al Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Al Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
SiSilicon
Si MicroclineK(AlSi3O8)
Si AlbiteNa(AlSi3O8)
Si AlmandineFe32+Al2(SiO4)3
Si BerylBe3Al2(Si6O18)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Si Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Si Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
K Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
CaCalcium
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca CalciteCaCO3
Ca Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
Ca Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Ca Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
TiTitanium
Ti IlmeniteFe2+TiO3
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe IlmeniteFe2+TiO3

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