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Behr Garnet Mine, Chelsea, Bethel Township, Delaware Co., Pennsylvania, USAi
Regional Level Types
Behr Garnet MineMine
Chelsea- not defined -
Bethel TownshipTownship
Delaware Co.County

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 39° North , 75° West (est.)
Margin of Error:~6km
Locality type:Mine
Köppen climate type:Cfa : Humid subtropical climate

Old Garnet mines, 1 mile southwest of Chelsea (abandoned). Host rock is Baltimore Gneiss. Garnet occurs massive and in gabbro at the contact point of serpentinite and gabbro, at approximately the lay of Green Creek bed.

Knowledge of these deposits were recorded as early as 1843, however interest in exploiting them did not come until the mid 1870's. First was Charles Williams, who owned the farm on which the deposits were located. His interest lay merely on the ornamental uses of the larger crystals, but quality crystals of size proved few and far between. The deposits soon attracted the attention of "Mineral John" Smedley, a then famous local prospector/mineralogist. Having no luck garnering the interest of local entrepreneurs, Mr. Smedley eventually peaked the interest of the Herman Behr & Co. of 79 Beekman Street, New York, which set up operations at the site in 1879. The garnets were recovered for use in abrasive papers, grinding wheels and marble polish. These deposits proved to be of a good quality, and plentiful enough to continue operation of the mines until as late as 1912.

The open pit workings of the original Behr Mine are now largely gone. The Conchester Highway (Route 322) was built through the middle of the pit, and though the back wall still exists, no mineralized zones have been observed. The area currently collected is actually the site of the American Glue Company Mine. Only Garnet Mine Road separated this site from the Behr workings, and was operated briefly by Behr after American Glue Co. pulled out. (reference/observations: J. Roger Mitchell, Delaware County Institute of/for Science)

Regions containing this locality

North America PlateTectonic Plate

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

6 valid minerals.

Detailed Mineral List:

Formula: (Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Formula: Fe2+3Al2(SiO4)3
Formula: Al2(SiO4)O
Formula: KAl2(AlSi3O10)(OH)2
Formula: SiO2
Formula: Mg3Si4O10(OH)2

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 9 - Silicates
Allophane9.ED.20(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Unclassified Minerals, Rocks, etc.

List of minerals arranged by Dana 8th Edition classification

Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
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
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Allophane71.1.5.1(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Unclassified Minerals, Mixtures, etc.

List of minerals for each chemical element

H Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
H TalcMg3Si4O10(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
O AlmandineFe32+Al2(SiO4)3
O KyaniteAl2(SiO4)O
O Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
O TalcMg3Si4O10(OH)2
O QuartzSiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
Mg TalcMg3Si4O10(OH)2
Al AlmandineFe32+Al2(SiO4)3
Al KyaniteAl2(SiO4)O
Al Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Al MuscoviteKAl2(AlSi3O10)(OH)2
Si AlmandineFe32+Al2(SiO4)3
Si KyaniteAl2(SiO4)O
Si Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Si TalcMg3Si4O10(OH)2
Si QuartzSiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
Fe AlmandineFe32+Al2(SiO4)3


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Gordon, S. (1922), Minerals of Pennsylvania: 185.
Geyer, A.R., Smith, R.C. & Barnes, J.H. (1976) Mineral Collecting in Pennsylvania.
Roger, Mitchell, J. (2001), The Garnet Mines of Chelsea, Pennsylvania, an Historical Perspective, Matrix: 9: 35-46.

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