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Keystone Trap Rock Quarry, Cornog, Wallace Township, Chester Co., Pennsylvania, USAi
Regional Level Types
Keystone Trap Rock QuarryQuarry
Cornog- not defined -
Wallace TownshipTownship
Chester Co.County
PennsylvaniaState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 40° 4' 36'' North , 75° 44' 54'' West
Latitude & Longitude (decimal): 40.07667,-75.74833
GeoHash:G#: dr45ur9xx
Locality type:Quarry
Köppen climate type:Cfa : Humid subtropical climate


A crushed stone quarry in Precambrian (Grenville) amphibolite gneiss within the Honeybrook uplift. The mineral assemblages for which this locality is well known, are the product of alpine cleft type hydrothermal recrystallization.

Operations started in 1907, but the quarry is now (2014) waterfilled.

Regions containing this locality

North America Plate

Plate - 4,949 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


19 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Albite
Formula: Na(AlSi3O8)
Reference: Bob Massey micromount collection, # GRM 1821
'Allanite Group'
Formula: {A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Habit: Long hair-like, fiberous
Colour: pale to deep green
Fluorescence: none
Description: Tremolite, Variety Byssolite occurs in long hairlike fiberous masses, closely associated with crystalized Prehnite and Clinozoisite at this site.
Reference: The Mineralogy of Pennstlvania 1922-1965; A. Montgomery, pg. 45
'Amphibole Supergroup var: Byssolite'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Habit: Long hair-like, fiberous
Colour: pale to deep green
Fluorescence: none
Description: Tremolite, Variety Byssolite occurs in long hairlike fiberous masses, closely associated with crystalized Prehnite and Clinozoisite at this site.
Reference: The Mineralogy of Pennstlvania 1922-1965; A. Montgomery, pg. 45
Ancylite-(Ce)
Formula: CeSr(CO3)2(OH) · H2O
Reference: Reed, Juliet C. (1976), Annotated Biblio. of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of PA, Inc.:16-17; Lapham, Davis M. & Geyer, Alan R. (1965),Mineral Collecting in PA: 55 & (1969): 56; Montgomery, A. (May, 1966), PA M
Axinite-(Fe)
Formula: Ca2Fe2+Al2BSi4O15OH
Reference: Reed, Juliet C. (1976), Annotated Biblio. of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of PA, Inc.:16-17, 38-39; Montgomery, Arthur (Jun, 1966), PM (42), Keystone Newsletter; Hess, David F. (Jul & Aug, 1966), "The Occurren
Calcioancylite-(Ce)
Formula: (Ce,Ca,Sr)CO3(OH,H2O)
Reference: Handbook of Mineralogy
Calcite
Formula: CaCO3
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Chalcopyrite
Formula: CuFeS2
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
'Chlorite Group'
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Clinozoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Habit: Prismatic, somewhat rectangular in cross section, rarely terminated
Colour: greenish qrey to pale greyish brown
Description: Early in the 1950's Excellent crystals were being collected in amphibolite gneiss at this location. crystals ranging from minute needles to stout prismatic crystals six inches long to one inch across. In 1960, the first accurate identification of Clinozoisite in PA was made by D. M. Lapham, PA. Geo. Survey, using specimens from this site.
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania. A. Montgomery "The Mineralogy of Pennsylvania 1922-1965" pgs. 44-45"
Dravite
Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Galena
Formula: PbS
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Goethite
Formula: α-Fe3+O(OH)
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Gypsum
Formula: CaSO4 · 2H2O
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
'Hornblende'
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
'K Feldspar'
Reference: [www.johnbetts-fineminerals.com]
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: [www.johnbetts-fineminerals.com]
'Limonite'
Formula: (Fe,O,OH,H2O)
Description: Pseudomorphs after pyrite
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Pyrite
Formula: FeS2
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Pyrrhotite
Formula: Fe7S8
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Quartz
Formula: SiO2
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Quartz var: Smoky Quartz
Formula: SiO2
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Reed, Juliet C., Annotated Bibliography of Minerals New to the Pennsylvania List - 1965-1974, Min. Soc. of PA, Inc. (1976): 70; Lapham, Davis M. and Geyer, Alan R. (1965), Mineral Collecting in PA, also (1969) edition.
Titanite
Formula: CaTi(SiO4)O
Reference: Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Habit: Long hair-like, fiberous
Colour: pale to deep green
Description: Tremolite, Variety Byssolite occurs in long hairlike fiberous masses, closely associated with crystalized Prehnite and Clinozoisite at this site.
Reference: The Mineralogy of Pennstlvania 1922-1965; A. Montgomery, pg. 45

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
'Galena'2.CD.10PbS
'Pyrite'2.EB.05aFeS2
'Pyrrhotite'2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
'Goethite'4.00.α-Fe3+O(OH)
'Quartz'4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Ancylite-(Ce)'5.DC.05CeSr(CO3)2(OH) · H2O
'Calcioancylite-(Ce)'5.DC.05(Ce,Ca,Sr)CO3(OH,H2O)
'Calcite'5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Gypsum'7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
'Actinolite'9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Albite'9.FA.35Na(AlSi3O8)
'Axinite-(Fe)'9.BD.20Ca2Fe2+Al2BSi4O15OH
'Clinozoisite'9.BG.05a{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
'Dravite'9.CK.05Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
'Prehnite'9.DP.20Ca2Al2Si3O10(OH)2
'Schorl'9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Titanite9.AG.15CaTi(SiO4)O
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'var: Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16b - HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
Ancylite-(Ce)16b.1.1.1CeSr(CO3)2(OH) · H2O
Calcioancylite-(Ce)16b.1.1.2(Ce,Ca,Sr)CO3(OH,H2O)
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Axinite-(Fe)56.2.2.1Ca2Fe2+Al2BSi4O15OH
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)
Clinozoisite58.2.1a.4{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Dravite61.3.1.9Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
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 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Rocks, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Allanite Group'-{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'var: Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Hornblende'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)
Quartz
var: Smoky Quartz
-SiO2

List of minerals for each chemical element

HHydrogen
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H Ancylite-(Ce)CeSr(CO3)2(OH) · H2O
H Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
H Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H Calcioancylite-(Ce)(Ce,Ca,Sr)CO3(OH,H2O)
H Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
H DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
H Goethiteα-Fe3+O(OH)
H GypsumCaSO4 · 2H2O
H Limonite(Fe,O,OH,H2O)
H PrehniteCa2Al2Si3O10(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
BBoron
B Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
B DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
C Ancylite-(Ce)CeSr(CO3)2(OH) · H2O
C Calcioancylite-(Ce)(Ce,Ca,Sr)CO3(OH,H2O)
C CalciteCaCO3
OOxygen
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O K Feldspar (var: Adularia)KAlSi3O8
O AlbiteNa(AlSi3O8)
O Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O Ancylite-(Ce)CeSr(CO3)2(OH) · H2O
O Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
O Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O Calcioancylite-(Ce)(Ce,Ca,Sr)CO3(OH,H2O)
O CalciteCaCO3
O Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
O Garnet GroupX3Z2(SiO4)3
O Goethiteα-Fe3+O(OH)
O GypsumCaSO4 · 2H2O
O Limonite(Fe,O,OH,H2O)
O PrehniteCa2Al2Si3O10(OH)2
O QuartzSiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Quartz (var: Smoky Quartz)SiO2
O TitaniteCaTi(SiO4)O
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
FFluorine
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
F Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Na AlbiteNa(AlSi3O8)
Na DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Mg DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
AlAluminium
Al K Feldspar (var: Adularia)KAlSi3O8
Al AlbiteNa(AlSi3O8)
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Al Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Al DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Al PrehniteCa2Al2Si3O10(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si K Feldspar (var: Adularia)KAlSi3O8
Si AlbiteNa(AlSi3O8)
Si Allanite Group{A12+REE3+}{M23+M32+}(Si2O7)(SiO4)O(OH)
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Si Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Garnet GroupX3Z2(SiO4)3
Si PrehniteCa2Al2Si3O10(OH)2
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Quartz (var: Smoky Quartz)SiO2
Si TitaniteCaTi(SiO4)O
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
SSulfur
S ChalcopyriteCuFeS2
S GalenaPbS
S GypsumCaSO4 · 2H2O
S PyriteFeS2
S PyrrhotiteFe7S8
ClChlorine
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Cl Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K K Feldspar (var: Adularia)KAlSi3O8
CaCalcium
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Ca Calcioancylite-(Ce)(Ce,Ca,Sr)CO3(OH,H2O)
Ca CalciteCaCO3
Ca Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Ca GypsumCaSO4 · 2H2O
Ca PrehniteCa2Al2Si3O10(OH)2
Ca TitaniteCaTi(SiO4)O
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
TiTitanium
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti TitaniteCaTi(SiO4)O
FeIron
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
CuCopper
Cu ChalcopyriteCuFeS2
SrStrontium
Sr Ancylite-(Ce)CeSr(CO3)2(OH) · H2O
Sr Calcioancylite-(Ce)(Ce,Ca,Sr)CO3(OH,H2O)
CeCerium
Ce Ancylite-(Ce)CeSr(CO3)2(OH) · H2O
Ce Calcioancylite-(Ce)(Ce,Ca,Sr)CO3(OH,H2O)
PbLead
Pb GalenaPbS

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cambrian
485.4 - 541 Ma



ID: 3192822
Paleozoic sedimentary rocks

Age: Cambrian (485.4 - 541 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Precambrian
541 - 4000 Ma



ID: 2855671
Banded mafic gneiss

Age: Precambrian (541 - 4000 Ma)

Description: Dark, fine to medium grained; includes rocks of probable sedimentary origin; may be equivalent to "PZmgh."

Comments: Digital map differences from 1980 printed map: name changed from (Gabbroic gneiss and gabbro). Original map source: Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000.

Lithology: Major:{gneiss}, Minor:{paragneiss}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Montgomery, A., et al (19__), Mineralogical Record: 2(1): 18-25 & 36.
Lapham, Davis M. & Geyer, Alan R. (1965), Mineral Collecting in Pennsylvania: 55.
Hess, David F. (1966), "The Occurrence of Axinite and Assoc. Mins. in the Keystone Trappe Rock Quarry, at Cornog," in Montgomery, PM (July & August): 43, 44.
Montgomery, A. (1966), Keystone Newsletter, Pennsylvania Minerals (PM): 41-42.
Montgomery, A. (1968), Pennsylvania Minerals (November): 71.
Montgomery , Arthur (1969): The mineralogy of Pennsylvania, 1922-1965; supplementing and updating Gordon's The mineralogy of Pennsylvania, (1922). Special Publication No. 9 of The Acadamy Of Natural Sciences Of Philadelphia, 140 pages.
Lapham, Davis M. & Geyer, Alan R. (1969), Mineral Collecting in Pennsylvania: 56-57.
Reed, Juliet C. (1976), Annotated Bibliography of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of Pennsylvania, Inc.: 16-17, 38-39.


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