505 COBAIT. other ores of silver and of copper, and lamellar heavy- spar, calcareous-spar, and quartz. Geographic Situation. > It is found at Alderly Edge, Cheshire, in red sand stone; in slate clay in the peninsula of Howth near Dublin ; at Reigelsdorf in Hessia; Schneeberg, Kams- dorf, and Saalfeld in Saxony; Bohemia; Wittichen in Furstenberg, Alpirsbach in Wurtenberg in Swabia; in the Upper Palatinate; Fuyen in the Zillerthall in Salz burg ; Kleinzell in Austria ; Kitsbichel in the Tyrol; Al- lemont in France; and in the valley of Gistain in . Spain. Use. It affords a most excellent blue colour; hence is high ly valued as an ore of cobalt. Observation. In the principality of Nassau there is a black ore of cobalt which is an intimate mixture of black cobalt-ochre and quartz,^ and which when melted, changes its co lour, becoming smalt-blue.