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Valhalla, Mount Pleasant, Westchester County, New York, USAi
Regional Level Types
Valhalla- not defined -
Mount PleasantMountain
Westchester CountyCounty
New YorkState
USACountry

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Latitude & Longitude (WGS84):
41° 4' 29'' North , 73° 46' 32'' West
Latitude & Longitude (decimal):
41.07472,-73.77556
GeoHash:
G#: dr799jqm8
GRN:
N28W40
KΓΆppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Valhalla3,162 (2017)0.0km
Fairview3,099 (2011)3.9km
Hawthorne4,586 (2017)4.0km
Elmsford4,810 (2017)4.3km
White Plains58,459 (2017)4.6km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Stamford Mineralogical SocietyStamford, Connecticut20km
Nassau Mineral ClubGlen Cove, New York26km
North Jersey Mineralogical Society, Inc.Paterson, New Jersey38km
New York Paleontological SocietyNYC, New York38km
New York Mineralogical ClubNew York, New York38km
Mindat Locality ID:
13442
Long-form identifier:
mindat:1:2:13442:5
GUID (UUID V4):
7ae50910-58ea-48de-b2ce-fee73643519a


This locality is a quarry opened to supply stone for the construction of the Kensico Dam. The quarry is about 1 mile East of the dam. Host rock is pink-gneissoid granite (Yonkers gneiss). Mineralization is found in more or less definite dikes and irregular masses differing from the rock.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

β“˜ Albite
Formula: Na(AlSi3O8)
β“˜ Albite var. Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Description: "peristerite"
β“˜ Albite var. Peristerite
Formula: Na(AlSi3O8)
Description: oligoclase
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜ Dumortierite
Formula: Al(Al2O)(Al2O)2(SiO4)3(BO3)
β“˜ 'Feldspar Group'
β“˜ Fluorite
Formula: CaF2
Colour: Greenish, violet.
β“˜ 'Garnet Group'
Formula: X3Z2(SiO4)3
β“˜ Graphite
Formula: C
Description: One nugget was 3 pounds (1.4 kg).
β“˜ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ Microcline var. Amazonite
Formula: K(AlSi3O8)
Colour: Grayish-green to bright bluish-green.
Description: Crystals to 8 inches (20 cm) and more.
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Quartz
Formula: SiO2
β“˜ Quartz var. Amethyst
Formula: SiO2
β“˜ Quartz var. Milky Quartz
Formula: SiO2
β“˜ Quartz var. Smoky Quartz
Formula: SiO2

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Graphite1.CB.05aC
Group 3 - Halides
β“˜Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
β“˜Quartz4.DA.05SiO2
β“˜var. Amethyst4.DA.05SiO2
β“˜var. Milky Quartz4.DA.05SiO2
β“˜var. Smoky Quartz4.DA.05SiO2
Group 9 - Silicates
β“˜Dumortierite9.AJ.10Al(Al2O)(Al2O)2(SiO4)3(BO3)
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜var. Amazonite9.FA.30K(AlSi3O8)
β“˜Albite
var. Peristerite		9.FA.35Na(AlSi3O8)
β“˜9.FA.35Na(AlSi3O8)
β“˜var. Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Unclassified
β“˜'Feldspar Group'-
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜'Hornblende Root Name Group'-β—»Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
β“˜'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
BBoron
Bβ“˜ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
CCarbon
Cβ“˜ GraphiteC
OOxygen
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ Microcline var. AmazoniteK(AlSi3O8)
Oβ“˜ Quartz var. AmethystSiO2
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oβ“˜ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Oβ“˜ QuartzSiO2
Oβ“˜ Quartz var. Smoky QuartzSiO2
Oβ“˜ Albite var. PeristeriteNa(AlSi3O8)
Oβ“˜ Quartz var. Milky QuartzSiO2
Oβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Oβ“˜ Garnet GroupX3Z2(SiO4)3
FFluorine
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fβ“˜ FluoriteCaF2
Fβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
NaSodium
Naβ“˜ AlbiteNa(AlSi3O8)
Naβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Naβ“˜ Albite var. PeristeriteNa(AlSi3O8)
MgMagnesium
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ Microcline var. AmazoniteK(AlSi3O8)
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alβ“˜ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Alβ“˜ Albite var. PeristeriteNa(AlSi3O8)
Alβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
SiSilicon
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ Microcline var. AmazoniteK(AlSi3O8)
Siβ“˜ Quartz var. AmethystSiO2
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siβ“˜ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Siβ“˜ QuartzSiO2
Siβ“˜ Quartz var. Smoky QuartzSiO2
Siβ“˜ Albite var. PeristeriteNa(AlSi3O8)
Siβ“˜ Quartz var. Milky QuartzSiO2
Siβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Siβ“˜ Garnet GroupX3Z2(SiO4)3
ClChlorine
Clβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
KPotassium
Kβ“˜ Microcline var. AmazoniteK(AlSi3O8)
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caβ“˜ FluoriteCaF2
Caβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Caβ“˜ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
TiTitanium
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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

Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1) New York Mineralogical Clubp.95
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