LOCALITIES.--Found in veins of quartz running through greenish or grayish slates, the quartz at the surface being generally full of cavities and rusted, and the slates below the surface often containing little cubic crystals of _Iron Pyrites_: also in the valleys traversed by mountain-streams and in the river sands and gravel below. _Iron_ and _Copper Pyrites_, _Galena_ and _Blende_ frequently contain gold. Masses of quartz and pyrites from the gold-regions, which make no show of gold, sometimes pay well; the value of such specimens can be [Illustration: WASHING AURIFEROUS SANDS.] determined only by an assayer. Eastern range of Appalachians, as Habersham, Rabun, Clark, Hall, Lumpkin and Lincoln Counties, Ga.; Abbeville, Chesterfield, Union, Lancaster and Pickens Counties, S. C.; Montgomery, Cabarras, Mechlenburg, Burke and Lincoln Counties, N. C.; Spotsylvania, Buckingham, Fauquier, Stafford, Culpepper, Orange, Goochland and Louisa Counties, Va.; Dedham, Mass.; Bridgewater, Vt.; Canaan and Lisbon, N. H.; on Sandy River and Madrid, Me. Numberless points along the higher Rocky Mountains and western slope of Sierra Nevada, as near Santa Fe, Cerillos and Avo, New Mex.; San Francisco, Wauba and Yuma District, Ariz; between Long’s Peak and Pike’s Peak, Col.; Comstock Lode, Nev.; Owyhee, Boise and Flint Districts and Poorman Lode, Idaho; Emigrant and Alder Gulches, Red Bluff and near Jefferson River, Mont.; Josephine District, Powder, Burnt, and John Day Rivers, western slope of Cascade Mountains, and southern coast, Oregon; Tulare, Fresno, Mariposa, Tuolumne, Calaveras, El Dorado, Placer, Nevada, Yuba, Sierra, Butte, Plumas, Shasta, Siskiyou Amador and Del Norte Counties, Cal. Rare in the coal-regions and Mississippi Valley. 34.--GRAPHITE. Occurs in foliated, scaly and granular masses; can be cut into thin slices, which are flexible, but not elastic; impressible by the nail; feels greasy; leaves a shining trace on paper; metallic lustre; not altered by heat or acids; gravity 2. VALUE.--Used for pencils, polishing, glazing, for making steel, crucibles, overcoming friction, etc. LOCALITIES.--Found in granite, slate and limestone rocks. Sturbridge, North Brookfield, Brimfield, Hinsdale and Worthington, Mass.; Cornwall and Ashford, Conn.; Brandon, Vt.; Woodstock, Me.; Goshen, Hillsboro and Keene, N. H.; Ticonderoga, Fishkill, Roger’s Rock, Johnsburg, Fort Ann, Amity, Rossie and Alexandria, N. Y.; Franklin and Lockwood, N. J.; Southampton and Buck’s County, Penn.; on the Gunpowder, Md.; Albemarle County, Va.; Wake, N. C.; Tiger River and Spartanburgh, S. C.; Sonora, Cal. (The soft black slate, often mistaken for _Graphite_, leaves a coaly trace on paper not a shining streak.) 35.--GRAY COPPER ORE. Occurs in crystallized or granular masses; metallic lustre; color between steel-gray and iron-black; brittle; the powder dissolved in nitric acid makes a brownish green solution; melts at a red heat; gravity 5.