362 SUPPLEMENT TO DESCRIPTIONS OF SPECIES. 



MICHIGAN. 



Brest (Monroe Co.). — Ca.Jcite, amethystine quartz, apatite, celestite. 



Grand Rapids. — Selenite, fib. and granular gypsum, cakite, dolomite, 

 anhydrite. 



Lake Superior Mining Region. — The four principal regions are 

 Keweenaw Point, Isle Royale, the Ontonagon, and Portage Lake. 

 The mines of Keweenaw Point are along two ranges of elevation, one 

 known as the Greenstone Range, and the other as the Southern or 

 Bohemian Range (Whitney). The copper occurs in the trap or amyg- 

 daloid, and in the associated conglomerate. Native copper! native 

 silver J chalcopyrite, horn silver, tetrahedrite, manganese ores, epi- 

 dote, prehnite, laumontite, datolite, heulandite, orthoclase, analdte, cha- 

 bazite, compact datolite, chrysocolla, mesotype (Copper Falls mine), 

 leonhardite lib. >, analdte (ib.), apophyUite iat Cliff mine), icollastonite 

 (ib.\ calcite, quartz (in crystals at Minnesota mine), compact datolite, 

 orthoclase (Superior mine), saponite, melaconite (near Copper Harbor, 

 but exhausted), chrysocolla ; on Chocolate River, galenite and sul- 

 phide of copper ; chalcopyrite and native copper at PresqTsle ; at 

 Albion mine. domeyJdte ; at Prince Vein, barite, calcite amethyst; at 

 Albany and Boston mine, Portage Lake, prehnite, analdte, orthoclase, 

 cuprite ; at Sheldon location, domeyJdte, uohUneyUe, algodonite ; Quincy 

 mine, calcite, compact datolite. At the Spur Mountain iron mine 

 ( magnetite ), chlorite pseudomorph after garnet ; Isle Royale, datolite, 

 prehnite. 



Marquette. — Manganite, galenite ; twelve miles west at Jackson 

 Mt., and other mines, hematite, limonite, gothite ! magnetite, jasper. 



Monroe. — Aragonite, apatite. 



Poent aux Peaux (Monroe Co.) — Amethystine, quartz, apatite, celes- 

 tite, calcite. 



Saginaw Bay. — At Alabaster, gypsum. 



Stony Point (Monroe Co.) — Apatite, amethystine quartz, celestite, 

 calcite. 



ILLINOIS. 



Gallatin Co., on a branch of Grand Pierre Creek, sixteen to thirty 

 miles from Shawneetown, down the Ohio, and from half to eight 

 miles from this river. — Violet fluoritel in carboniferous limestone, 

 barite, galenite, blende, brown iron ore. 



Hancock Co. — At Warsaw, quartz geodes containing calcite/ chal- 

 cedony, dolomite, blende! brown spar, pyrite, aragonite, gypsum, bitu- 

 men. 



Hardin Co. — Near Rosiclare, cakite, galenite. blende ; five miles 

 back from Elizabethtown, bog iron ; one mile north of the river, be- 

 tween Elizabethtown and Rosiclare, nitre. 



Jo Daviess Co.— At Galena, galenite, calcite, pyrite, blende ; at Mars- 

 den's diggings, galenite ! blende, cerussite, marcasite in stalactitic forms, 

 pyrite. 

 * Jollet. — Ma rble. 



Quincy.— Calcite ! pvrite. 



Scales Mound.— Barite, pyrite. 



