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Brinton's Quarry, Westtown Township, Chester Co., Pennsylvania, USAi
Regional Level Types
Brinton's QuarryQuarry
Westtown TownshipTownship
Chester Co.County
PennsylvaniaState
USACountry

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Key
Latitude & Longitude (WGS84):
39° 55' 50'' North , 75° 33' 10'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
West Chester19,842 (2017)5.8km
Chester Heights2,626 (2017)8.0km
Lima2,735 (2017)9.7km
Malvern3,430 (2017)12.2km
Exton4,842 (2017)12.4km


A former serpentine occurrence/quarry located in Westtown Township, 1.4 miles S of West Chester. First opened in 1730. This locality is not listed in the USGS MRDS database.

Workings include surface openings comprised of 3 quarry pits (closed).

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


14 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Dana, 1868, 778
Aragonite
Formula: CaCO3
Reference: The Mineralogy of Pennsylvania; Samual Gordon, pg. 182
'Asbestos'
Reference: Dana, 1868, 778
Beryl
Formula: Be3Al2(Si6O18)
Reference: Dana 6:1068.
Brucite
Formula: Mg(OH)2
Reference: Mineral collecting in Pennsylvania, 1965 - Lapham & Geyer, pg. 130
Clinochlore (TL)
Formula: Mg5Al(AlSi3O10)(OH)8
Type Locality:
Reference: Dana 6:1068; Rocks & Min.: 21:22.
Clinochlore var: Colerainite
Formula: 4MgO · Al2O3 · 2SiO2 · 5H2O
Reference: Gordon, 1922. Mineralogy of Pennsylvania, p.125
Forsterite
Formula: Mg2SiO4
Reference: Annotated Bibliography of Minerals New to the Pennsylvania List - 1965-1974, Reed, Juliet C., Min. Soc. of PA, Inc. (1976): 41; Lapham, Davis M. and Geyer, Alan R. (1965), Mineral Collecting in PA: 50, 81; (1969): 52, 87.
Hydromagnesite
Formula: Mg5(CO3)4(OH)2 · 4H2O
Reference: Mineral collecting in Pennsylvania, 1965 - Lapham & Geyer, pg. 130
Ilmenite
Formula: Fe2+TiO3
Reference: Dana, 1868, 778
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Mineral collecting in Pennsylvania, 1965 - Lapham & Geyer, pg. 130
Magnetite
Formula: Fe2+Fe3+2O4
Reference: The Mineralogy of Pennsylvania - 1922: Samuel G. Gordon, Pg. 189
Phlogopite ?
Formula: KMg3(AlSi3O10)(OH)2
Colour: Green
Description: The one and only report of Phlogoptite ever suggested from this locality, where all previous studies of the local geology would suggest that any presence of the species would have long since altered to Vermiculite. Visually, the specimen is an exact match to the local Clinochlore (TL), the bench-mark for the species, and this sample had perviously been identified as such. Validity of I.D. questioned.
Reference: RRUFF Project: http://rruff.info/phlogopite/names/asc/R040144
Quartz
Formula: SiO2
Reference: Dana 6:1068.
Quartz var: Amethyst
Formula: SiO2
Reference: Dana 6:1068.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Reed, Juliet C., Annotated Bibliography of Minerals New to the Pa List - 1965-1974, Min. Soc. of PA, Inc. (1976): 41, 70; Lapham, Davis M. and Geyer, Alan R. (1965), Min. Collecting in PA; also: (1969) edition.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Dana 6: 1068.
Talc
Formula: Mg3Si4O10(OH)2
Reference: Rocks & Min.: 21:22.
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: Mineral collecting in Pennsylvania, 1965 - Lapham & Geyer, pg. 130
Vermiculite
Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Habit: Play crystals with pseudo-hexagonal outline
Colour: Dark Greenish-brown
Fluorescence: none
Description: old varietal name 'Jeffersite'. Named after famed Chester Co. collector William Jefferies, whose collection formed the core of the Carnegie Museum collection. The occurrence from this locale was later determined to be Vermiculite and this new species was invalidated .
Reference: Gordon, S.G. (1922) The Mineralogy of Pennsylvania. 255 pp., Philadelphia.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Brucite4.FE.05Mg(OH)2
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Aragonite5.AB.15CaCO3
Hydromagnesite5.DA.05Mg5(CO3)4(OH)2 · 4H2O
Group 9 - Silicates
Beryl9.CJ.05Be3Al2(Si6O18)
Clinochlore (TL)9.EC.55Mg5Al(AlSi3O10)(OH)8
var: Colerainite9.EC.554MgO · Al2O3 · 2SiO2 · 5H2O
Forsterite9.AC.05Mg2SiO4
Phlogopite ?9.EC.20KMg3(AlSi3O10)(OH)2
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Talc9.EC.05Mg3Si4O10(OH)2
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Vermiculite9.EC.50Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Asbestos'-
'Limonite'-(Fe,O,OH,H2O)
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
X(OH)2
Brucite6.2.1.1Mg(OH)2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 16b - HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
Hydromagnesite16b.7.1.1Mg5(CO3)4(OH)2 · 4H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite ?71.2.2b.1KMg3(AlSi3O10)(OH)2
Talc71.2.1.3Mg3Si4O10(OH)2
Vermiculite71.2.2d.3Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore (TL)71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Aragonite-CaCO3
'Asbestos'-
Clinochlore
var: Colerainite
-4MgO · Al2O3 · 2SiO2 · 5H2O
'Limonite'-(Fe,O,OH,H2O)
Quartz
var: Amethyst
-SiO2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H TalcMg3Si4O10(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
H Clinochlore (var: Colerainite)4MgO · Al2O3 · 2SiO2 · 5H2O
H BruciteMg(OH)2
H HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
H Limonite(Fe,O,OH,H2O)
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H PhlogopiteKMg3(AlSi3O10)(OH)2
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
C AragoniteCaCO3
C HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
OOxygen
O ClinochloreMg5Al(AlSi3O10)(OH)8
O BerylBe3Al2(Si6O18)
O Quartz (var: Amethyst)SiO2
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O TalcMg3Si4O10(OH)2
O ForsteriteMg2SiO4
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
O Clinochlore (var: Colerainite)4MgO · Al2O3 · 2SiO2 · 5H2O
O AragoniteCaCO3
O MagnetiteFe2+Fe23+O4
O BruciteMg(OH)2
O HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
O Limonite(Fe,O,OH,H2O)
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O IlmeniteFe2+TiO3
O QuartzSiO2
O PhlogopiteKMg3(AlSi3O10)(OH)2
FFluorine
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg TalcMg3Si4O10(OH)2
Mg ForsteriteMg2SiO4
Mg VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Mg Clinochlore (var: Colerainite)4MgO · Al2O3 · 2SiO2 · 5H2O
Mg BruciteMg(OH)2
Mg HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
AlAluminium
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al BerylBe3Al2(Si6O18)
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Al Clinochlore (var: Colerainite)4MgO · Al2O3 · 2SiO2 · 5H2O
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al PhlogopiteKMg3(AlSi3O10)(OH)2
SiSilicon
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si BerylBe3Al2(Si6O18)
Si Quartz (var: Amethyst)SiO2
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si TalcMg3Si4O10(OH)2
Si ForsteriteMg2SiO4
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Si Clinochlore (var: Colerainite)4MgO · Al2O3 · 2SiO2 · 5H2O
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si QuartzSiO2
Si PhlogopiteKMg3(AlSi3O10)(OH)2
ClChlorine
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca AragoniteCaCO3
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
TiTitanium
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti IlmeniteFe2+TiO3
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Fe MagnetiteFe2+Fe23+O4
Fe Limonite(Fe,O,OH,H2O)
Fe IlmeniteFe2+TiO3
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Rogers, H.D., Fraser, P. & Hall, C. (1883) The Geology of Chester County, Report of the Second Geological Survey, Harrisburg: 63.
Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York.: 1068.
McKinstry, Hugh (1916) The minerals of Brinton’s quarry, Chester County, Pennsylvania, American Mineralogist: 1(4): 57-62.
Rocks & Minerals (1945): 20: 358.
Rocks & Minerals (1946): 21: 22.
Lapham, Davis M. and Geyer, Alan R. (1965), Mineral Collecting in Pennsylvania: 50, 53, 56, 58, 62, 76, 81, 101.
Lapham, Davis M. and Geyer, Alan R. (1969): Mineral Collecting in Pennsylvania: 52, 55, 57, 61, 64, 80, 82, 87, 111.
Reed, Juliet C. (1976), Annotated Bibliography of Minerals New to the Pennsylvania List - 1965-1974, Mineralogical Society of Pennsylvania, Inc.: 41, 70.

Other Regions, Features and Areas containing this locality

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