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Fanwood Quarry (Fanwood Stone Crushing and Quarry Co. Quarry; Fanwood Crushed Stone Co. Quarry; Scotch Plains Quarry; Weldon Quarry), Watchung, Somerset Co., New Jersey, USAi
Regional Level Types
Fanwood Quarry (Fanwood Stone Crushing and Quarry Co. Quarry; Fanwood Crushed Stone Co. Quarry; Scotch Plains Quarry; Weldon Quarry)Quarry
Watchung- not defined -
Somerset Co.County
New JerseyState
USACountry

This page kindly sponsored by Stephen C. Blyskal
Key
Latitude & Longitude (WGS84):
40° 39' 39'' North , 74° 24' 24'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Scotch Plains23,584 (2017)1.5km
Fanwood7,651 (2017)3.0km
Plainfield51,217 (2017)3.0km
North Plainfield22,140 (2017)3.8km
Berkeley Heights14,179 (2017)3.9km


A large quarry in the Orange Mountain (First Watchung) basalt, which has been owned and operated by the Weldon family since the 1890's. Mineralization principally occurs in cavities within three amygdaloidal horizons, in fractures, in breccia pockets of the scoria, and in isolated cavities, sometimes large, in the interior of the flows. These latter structures are probably related to cooling of the lava. Locally, structures have been observed in mostly weathered outcrops of the scoriaceous basalt just below the basal part of the third flow unit, that may be pillows or, more likely, pah hoe hoe toes.

On first observation the abundant mineralization in this quarry is very apparent and the immediate impression is that it exudes potential. In fact, good specimens are much harder to find here than in they were in the equivalent horizon in the nearby Summit Quarry. So many of the amygdules are partially filled with a scoria-like material that open spaces tend strongly to be restricted in size and exhibit a geometry that makes specimen extraction difficult.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


16 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Anhydrite
Formula: CaSO4
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
'Apophyllite'
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Bornite
Formula: Cu5FeS4
Description: Occurs in fractures in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Calcite
Formula: CaCO3
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Chalcopyrite
Formula: CuFeS2
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
'Chlorite Group'
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Datolite
Formula: CaB(SiO4)(OH)
Description: Occurs in cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Rocks & Min.:62:150-159.
Galena
Formula: PbS
Habit: modified cubic
Colour: silver
Description: Specimens are micro in size, usually on prehnite
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
'Gmelinite'
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Hematite
Formula: Fe2O3
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
'Heulandite subgroup'
Description: Occurs in cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 5, No. 1, Manchester, J.G. (1931): 91.
Pectolite
Formula: NaCa2Si3O8(OH)
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:156.
'Pumpellyite'
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Pyrite
Formula: FeS2
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Quartz
Formula: SiO2
Description: Occurs in cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Quartz var: Chalcedony
Formula: SiO2
Description: Occurs in cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
Stellerite
Formula: Ca4(Si28Al8)O72 · 28H2O
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.
'Stilbite subgroup'
Description: Occurs in fractures and cavities in Watchung basalt.
Reference: Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals, 62:155.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Datolite9.AJ.20CaB(SiO4)(OH)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Pectolite9.DG.05NaCa2Si3O8(OH)
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Stellerite9.GE.15Ca4(Si28Al8)O72 · 28H2O
Unclassified Minerals, Rocks, etc.
'Apophyllite'-
'Chlorite Group'-
'Gmelinite'-
'Heulandite subgroup'-
'Pumpellyite'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anhydrite28.3.2.1CaSO4
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(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 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Pectolite65.2.1.4aNaCa2Si3O8(OH)
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
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Fluorapophyllite-(K)72.3.1.1KCa4(Si8O20)(F,OH) · 8H2O
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)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Stellerite77.1.4.4Ca4(Si28Al8)O72 · 28H2O
Unclassified Minerals, Mixtures, etc.
'Apophyllite'-
'Chlorite Group'-
'Gmelinite'-
'Heulandite subgroup'-
'Pumpellyite'-
Quartz
var: Chalcedony
-SiO2
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
H NatroliteNa2Al2Si3O10 · 2H2O
H DatoliteCaB(SiO4)(OH)
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H PectoliteNaCa2Si3O8(OH)
H PrehniteCa2Al2Si3O10(OH)2
H StelleriteCa4(Si28Al8)O72 · 28H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
OOxygen
O Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
O NatroliteNa2Al2Si3O10 · 2H2O
O AlbiteNa(AlSi3O8)
O AnhydriteCaSO4
O CalciteCaCO3
O Quartz (var: Chalcedony)SiO2
O DatoliteCaB(SiO4)(OH)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O HematiteFe2O3
O PectoliteNaCa2Si3O8(OH)
O PrehniteCa2Al2Si3O10(OH)2
O QuartzSiO2
O StelleriteCa4(Si28Al8)O72 · 28H2O
FFluorine
F Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
NaSodium
Na NatroliteNa2Al2Si3O10 · 2H2O
Na AlbiteNa(AlSi3O8)
Na PectoliteNaCa2Si3O8(OH)
AlAluminium
Al NatroliteNa2Al2Si3O10 · 2H2O
Al AlbiteNa(AlSi3O8)
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al PrehniteCa2Al2Si3O10(OH)2
Al StelleriteCa4(Si28Al8)O72 · 28H2O
SiSilicon
Si Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si AlbiteNa(AlSi3O8)
Si Quartz (var: Chalcedony)SiO2
Si DatoliteCaB(SiO4)(OH)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si PectoliteNaCa2Si3O8(OH)
Si PrehniteCa2Al2Si3O10(OH)2
Si QuartzSiO2
Si StelleriteCa4(Si28Al8)O72 · 28H2O
SSulfur
S AnhydriteCaSO4
S BorniteCu5FeS4
S ChalcopyriteCuFeS2
S PyriteFeS2
S GalenaPbS
KPotassium
K Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
CaCalcium
Ca Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Ca AnhydriteCaSO4
Ca CalciteCaCO3
Ca DatoliteCaB(SiO4)(OH)
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca PectoliteNaCa2Si3O8(OH)
Ca PrehniteCa2Al2Si3O10(OH)2
Ca StelleriteCa4(Si28Al8)O72 · 28H2O
FeIron
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HematiteFe2O3
Fe PyriteFeS2
CuCopper
Cu BorniteCu5FeS4
Cu ChalcopyriteCuFeS2
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Mineral Industry of New Jersey for 1926: 10.
Manchester, J.G. (1931) The Minerals of New York City & Its Environs. New York Mineralogical Club Bulletin, 3: 91.
Cummings, W. (1987) Mineralization at the Fanwood and Summit Quarries, New Jersey. Rocks & Minerals: 62: 150-59.
Imbriacco III, F.A. (2010) Fanwood Quarry, Somerset County, New Jersey. Mineralogical Record: 41: 161-174.


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