124 BULLETIN 42, UNITED STATES NATIONAL MUSEUM. 



Eleven specimens rei)reseut the Freuclj Creek Mine: 



(1) Magnetite, pyrite, ami ciilcite. Shaft No. 1. (41907.) 



(2) Magnetite, uiicaceous, pyrite undergoing ilcconiposition. Shaft No. 1. (41894.) 



(3) Magnetite, pyrite, and calcite. Shaft No. 1. (41895.) 



(4) Granitic rock; hanging wall. Shaft No. 1. (43611.) 



(5) Calcite, inclosing granite rock, hanging wall. Shaft No. 1. (43G10.) 



(6) Trap rock, in west wall. (43612.) 



(7) Quartzite, east wall. Shaft No. 1. (43856.) 



(8) Granitic rock, foot wall. Shaft No. 1. (43609.) 



(9) Magnetite, containing calcite, and pyrite. Shaft No. 2. (41908.) 



(10) Magnetite, pyrite crystals, octahedrons, chloritic material. Shaft No. 2. 

 (406d9.) 



(11) Hanging wall. Shaft No. 2. (40690.) 



Three specimens represent the Barto Mine, at Barto, taken July 5, 

 1881 : 



(1) Magnetite, containing pyrite. (41892.) 



(2) Granite rock, showing slickensides, wall rock. (41893.) 



(3) Epidoterock. (40686.) 



Five specimens rei)resent the Hopewell Mine, at St. Mary's, taken 

 Jnly 13, 1881: 



(1) Magnetite, containing octahedral crystals. (41897.) 



(2) Magnetite, containing pyrite, and calcite. (41898.) 



(3) Quartzite, foot wall. (41938.) 



(4) Granitic rock, coarse ; wall rock. (41940.) 



(5) Trap rock. (41939.) 



(1) Limouite, pipe ore. Frank Brownback Mine, Long Swamp. October 18, 

 1880. (40709.) 



(2) Magnetite, pyrite, decomposed silicates; immediately below the limestone, 

 Jon.'ft Mine. (41905.) 



(3) Magnetite, pyrite, chalcopyrite, and <lolomite. Jones Mine. (41909.) 



(4) Magnetite, quartz, and feldspar. Mine Hill Mine, Durham. October 20, 1880. 

 (40706.) 



CHESTER COUNTY. 



Four specimens represent the Stauffer's Mine, at West Vincent, taken 

 June 22, 1881. 



(1) Limouite, geode. (40698.) 



(2) Limouite. (40682.) 



(3) Limonite, cementing quartz pebbles. (41936.) 



(4) Limonite and quartz. (40711.) 



LEBANON COUNTY. 



Ten specimens represent the Great Cornwall Mines, taken June 18, 



1881. 



(1) Magnetite, containing much pyrite. (42297.) 



(2) Impure banded magnetite, with pyrite. (40684.) 



(3) Magnetite, containing pyrite. (41902.) 



(4) Magnetite, containing pyrite, and decomposed silicates. (43712.) 



(5) Impure magnetite, pyrite. (43716.) 



(6) Calcite. (41903,) 



(7) Pyrite, crystallized, with magnetite. (40680.) 



