ANNUAL REPORT FOR 1873. 29 



Tourmaline. — Outlet of Lac de Flambeau. (Schoolcrafi .) 



Cyanite (Kyanite). — Lac de Flambeau. (Dr. Norwood.) 



Laumonite. — Copper veins on the Montreal river. (J. P. Hodges.) 



Chrysocolla (Silicious Oxide of Copper). — Wisconsin, with carbonate of copper. (Dana.) 



Prehnite. — Accompanying copper ores, Lake Superior. 



Talc. — Ableman, Sauk county, in quartzite. 



Glauconite (?) (Green Sand). — Forming layers in the Potsdam and Upper sandstone 

 Madison, Janesville and numerous other places. 



Sapronite (Thalite, Owen). — Black river (of Lake Superior). Tln-ee miles above Kettle 

 river. 



Kaolinite. — Grand Rapids, Wood county. Potter's clay at Menasha and elsewhere. 

 Brick clay at Milwaukee, Watertown, Port Washington, Sheboygan, etc., making 

 brick of a light cream color. Pipestone (Catlinite) in Barron county on lands IXi- 

 longing to the Cornell University. There are also clays so largely consisting of 

 silex in minute grains as to be useful as polishing powders. 



Apatite (Phosphate of Lime). — In the Potsdam sandstone and in Galena limestone the 

 fossil Lingulse are composed of phosphate of hme. 



Barite (Sulphate of Barites. Heavy Spar). — Abundant in tlie lead region; Mineral 

 Point, Shullsburg, etc. 



Celestite (Sulphate of Strontia). — In drift clay filling a crevice in limestone, Wauwatosa 

 near Milwaukee. 



Anglesite (Sulphate of Lead). — In small crystals, lining cavities in galenite at Mineral 

 Point. 



Leadhillite. — At Mineral Point. (Owen.) 



Gypsum. — At Sturgeon Bay. Also among the lead mines. 



Melanterite (Sulphate of Iron, Copperas). — In the lead mines, formed by the decompo- 

 sition of marcasite (iron pyrites). 



Calcite (Calcareous Spar, Tiff).— Common in the lead region. Fine crystals (scalene 

 dodecahedrons) at Shullsburg. Coarse stalactites in Cleveland's Cave, Dane coun- 

 ty. Tufa deposited from springs incrusting moss, leaves, sticks, etc., at numerous 

 places. Travertine (called marble) in Sauk and Richland counties. Hydraulic 

 limestone has been found in some localities. 



Dolomite. — Most of the Hmestones of Wisconsin contaiji magnesia, and ^e properly 

 dolomites. 



Siderite (Carbonate of Iron). — Penokee Iron Range, Ashland county ;_ rare. 



Smithsonite (Carbonate of Zinc, Dry Bone). — At Mineral Pomt, and "other places in the 

 lead region. Extensively mined for the manufacture of zinc. 



Cerussite (Carbonate of Lead, White Lead ore). — At Mineral Point, Blue Mounds and 

 elsewhere in the lead region. 



Eydrozincite (Calamine, Zinc bloom). — At Linden in a concretionary fibrous crust on 

 Smithsonite (Whitney). 



Malachite (Green Carbonate of Copper).— In miaute quantities in connection with 

 other copper ores, Mineral Point, etc. 



Azurite (Blue Carbonate of Copper).— At Mineral Point;' Left Hand river, in minute 



quantities. 



IV. Hydkocabbon Compounds. 



Pstroleum. — Some layers of rock in the lead region are highly bituminous, bummg 

 with a flame when heated. 



Asphaltum. — Some small cavities in the Devonian limestone near Milwaukee, and 

 also east of Fond du Lac, contain mineral tar. 



Peat is found underlying very many of the bogs and swamps; sufficient to be of econo- 

 mic value whenever the forests are destroyed and coal becomes scai-ce. 



