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Cortlandt Township, Westchester Co., New York, USAi
Regional Level Types
Cortlandt TownshipTownship
Westchester Co.County
New YorkState
USACountry

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Key
Lock Map
Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 41° North , 73° West (est.)
Margin of Error:~2km
Locality type:Township
Köppen climate type:Cfa : Humid subtropical climate


[Note that the city of Peekskill is no longer part of Cortlandt.]

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

27 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite
Formula: Na(AlSi3O8)
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Eur. J. Mineral. , 1991, 3, pp. 367-386.
'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Analcime
Formula: Na(AlSi2O6) · H2O
'Apatite'
'Biotite'
Calcite
Formula: CaCO3
Chalcopyrite
Formula: CuFeS2
'Chlorite Group'
'Chrysolite'
Chrysotile
Formula: Mg3(Si2O5)(OH)4
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Reference: Jensen (1978) Minerals of New York State, p.153
'Corundite'
Reference: Jensen (1978) Minerals of New York State, p.153
Corundum
Formula: Al2O3
Reference: Mineralogical Magazine 1963 33 : 635-645
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
'Garnet Group'
Formula: X3Z2(SiO4)3
Hercynite
Formula: Fe2+Al2O4
Reference: Eur. J. Mineral. , 1991, 3, pp. 367-386.
'Högbomite'
Formula: (Mg,Fe)2(Al,Ti)5O10
Kyanite
Formula: Al2(SiO4)O
'Limonite'
Formula: (Fe,O,OH,H2O)
Magnesiohögbomite-6N6S
Formula: [(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
Magnesio-riebeckite
Formula: ◻{Na2}{Mg3Fe3+2}(Si8O22)(OH)2
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Mineralogical Magazine 1963 33 : 635-645
Magnetite var: Titaniferous Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
Reference: Mineralogical Magazine 1963 33 : 635-645
Molybdenite
Formula: MoS2
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Opal
Formula: SiO2 · nH2O
Opal var: Opal-AN
Formula: SiO2 · nH2O
'Orthopyroxene Subgroup'
Reference: Eur. J. Mineral. , 1991, 3, pp. 367-386.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Pyrite
Formula: FeS2
'Pyroxene Group'
Pyrrhotite
Formula: Fe7S8
Quartz
Formula: SiO2
Reference: Eur. J. Mineral. , 1991, 3, pp. 367-386.
Sapphirine
Formula: Mg4(Mg3Al9)O4[Si3Al9O36]
Reference: Jensen (1978) Minerals of New York State, p.153; Mineralogical Magazine 1963 33 : 635-645
Sillimanite
Formula: Al2(SiO4)O
Reference: Jensen (1978) Minerals of New York State, p.153
Spinel
Formula: MgAl2O4
Reference: Mineralogical Magazine 1963 33 : 635-645
Spinel var: Ceylonite
Formula: MgAl2O4
Staurolite
Formula: Fe2+2Al9Si4O23(OH)
'Stilbite subgroup'
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
Hercynite4.BB.05Fe2+Al2O4
Magnesiohögbomite-6N6S4.CB.20[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
Magnetite4.BB.05Fe2+Fe3+2O4
var: Titaniferous Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
Opal4.DA.10SiO2 · nH2O
var: Opal-AN4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
Spinel4.BB.05MgAl2O4
var: Ceylonite4.BB.05MgAl2O4
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Group 9 - Silicates
'Actinolite'9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Albite'9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
'Almandine'9.AD.25Fe2+3Al2(SiO4)3
'Analcime'9.GB.05Na(AlSi2O6) · H2O
Chrysotile9.ED.15Mg3(Si2O5)(OH)4
Cordierite9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Kyanite9.AF.15Al2(SiO4)O
Magnesio-riebeckite9.DE.25◻{Na2}{Mg3Fe3+2}(Si8O22)(OH)2
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Sapphirine9.DH.45Mg4(Mg3Al9)O4[Si3Al9O36]
Sillimanite9.AF.05Al2(SiO4)O
Staurolite9.AF.30Fe2+2Al9Si4O23(OH)
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Apatite'-
'Biotite'-
Chlorite Group-
Chrysolite-
Corundite-
Garnet Group-X3Z2(SiO4)3
Högbomite-(Mg,Fe)2(Al,Ti)5O10
Limonite-(Fe,O,OH,H2O)
Orthopyroxene Subgroup-
Pyroxene Group-
Stilbite subgroup-
Tourmaline-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Group 7 - MULTIPLE OXIDES
AB2X4
Hercynite7.2.1.3Fe2+Al2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Spinel7.2.1.1MgAl2O4
Miscellaneous
'Högbomite'7.11.7.3(Mg,Fe)2(Al,Ti)5O10
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 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Kyanite52.2.2c.1Al2(SiO4)O
Sillimanite52.2.2a.1Al2(SiO4)O
Staurolite52.2.3.1Fe2+2Al9Si4O23(OH)
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with Al substituted rings
Cordierite61.2.1.1(Mg,Fe)2Al3(AlSi5O18)
Group 69 - INOSILICATES Chains with Side Branches or Loops
Chains with Side Branches or Loops with P>2
Sapphirine69.2.1b.1Mg4(Mg3Al9)O4[Si3Al9O36]
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Chrysotile71.1.5.1Mg3(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Rocks, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite
var: Oligoclase
-(Na,Ca)[Al(Si,Al)Si2O8]
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Apatite'-
'Biotite'-
'Chlorite Group'-
'Chrysolite'-
'Corundite'-
'Garnet Group'-X3Z2(SiO4)3
'Limonite'-(Fe,O,OH,H2O)
Magnesio-riebeckite-◻{Na2}{Mg3Fe3+2}(Si8O22)(OH)2
Magnesiohögbomite-6N6S-[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
Magnetite
var: Titaniferous Magnetite
-Fe2+(Fe3+,Ti)2O4
Opal
var: Opal-AN
-SiO2 · nH2O
'Orthopyroxene Subgroup'-
'Pyroxene Group'-
Spinel
var: Ceylonite
-MgAl2O4
'Stilbite subgroup'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H AnalcimeNa(AlSi2O6) · H2O
H ChrysotileMg3(Si2O5)(OH)4
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Limonite(Fe,O,OH,H2O)
H Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
H Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H NatroliteNa2Al2Si3O10 · 2H2O
H OpalSiO2 · nH2O
H Opal (var: Opal-AN)SiO2 · nH2O
H PhlogopiteKMg3(AlSi3O10)(OH)2
H StauroliteFe22+Al9Si4O23(OH)
BBoron
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
CCarbon
C CalciteCaCO3
OOxygen
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O AlbiteNa(AlSi3O8)
O AlmandineFe32+Al2(SiO4)3
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O AnalcimeNa(AlSi2O6) · H2O
O CalciteCaCO3
O Spinel (var: Ceylonite)MgAl2O4
O ChrysotileMg3(Si2O5)(OH)4
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O CorundumAl2O3
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Garnet GroupX3Z2(SiO4)3
O HercyniteFe2+Al2O4
O Högbomite(Mg,Fe)2(Al,Ti)5O10
O KyaniteAl2(SiO4)O
O Limonite(Fe,O,OH,H2O)
O Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
O Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
O MagnetiteFe2+Fe23+O4
O MuscoviteKAl2(AlSi3O10)(OH)2
O NatroliteNa2Al2Si3O10 · 2H2O
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O OpalSiO2 · nH2O
O Opal (var: Opal-AN)SiO2 · nH2O
O PhlogopiteKMg3(AlSi3O10)(OH)2
O QuartzSiO2
O SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
O SillimaniteAl2(SiO4)O
O SpinelMgAl2O4
O StauroliteFe22+Al9Si4O23(OH)
O Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
FFluorine
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Na AlbiteNa(AlSi3O8)
Na AnalcimeNa(AlSi2O6) · H2O
Na Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
Na NatroliteNa2Al2Si3O10 · 2H2O
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg Spinel (var: Ceylonite)MgAl2O4
Mg ChrysotileMg3(Si2O5)(OH)4
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mg Högbomite(Mg,Fe)2(Al,Ti)5O10
Mg Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
Mg Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Mg SpinelMgAl2O4
AlAluminium
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al AnalcimeNa(AlSi2O6) · H2O
Al Spinel (var: Ceylonite)MgAl2O4
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al CorundumAl2O3
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al HercyniteFe2+Al2O4
Al Högbomite(Mg,Fe)2(Al,Ti)5O10
Al KyaniteAl2(SiO4)O
Al Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al NatroliteNa2Al2Si3O10 · 2H2O
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Al SillimaniteAl2(SiO4)O
Al SpinelMgAl2O4
Al StauroliteFe22+Al9Si4O23(OH)
SiSilicon
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si AlbiteNa(AlSi3O8)
Si AlmandineFe32+Al2(SiO4)3
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si AnalcimeNa(AlSi2O6) · H2O
Si ChrysotileMg3(Si2O5)(OH)4
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si Garnet GroupX3Z2(SiO4)3
Si KyaniteAl2(SiO4)O
Si Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si NatroliteNa2Al2Si3O10 · 2H2O
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si OpalSiO2 · nH2O
Si Opal (var: Opal-AN)SiO2 · nH2O
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si QuartzSiO2
Si SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Si SillimaniteAl2(SiO4)O
Si StauroliteFe22+Al9Si4O23(OH)
SSulfur
S ChalcopyriteCuFeS2
S MolybdeniteMoS2
S PyriteFeS2
S PyrrhotiteFe7S8
ClChlorine
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca CalciteCaCO3
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
TiTitanium
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti Högbomite(Mg,Fe)2(Al,Ti)5O10
Ti Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
Ti Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
FeIron
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe AlmandineFe32+Al2(SiO4)3
Fe ChalcopyriteCuFeS2
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HercyniteFe2+Al2O4
Fe Högbomite(Mg,Fe)2(Al,Ti)5O10
Fe Limonite(Fe,O,OH,H2O)
Fe Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
Fe Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
Fe MagnetiteFe2+Fe23+O4
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe StauroliteFe22+Al9Si4O23(OH)
Fe Magnetite (var: Titaniferous Magnetite)Fe2+(Fe3+,Ti)2O4
CuCopper
Cu ChalcopyriteCuFeS2
MoMolybdenum
Mo MolybdeniteMoS2

Localities in this Region
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