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FLUOR-SPAR. 2£5 thus, it has been found penetrating and encrusting bi valve shells *; and entroclu have been described, in which the one-half was calcareous carbonate, having the natural texture of the etitrochus, the other half pure violet-co loured fluor-spar •f. Geographic Situation. Knrope.—Fluor-spar is a rare mineral in Scotland, having been hitherto found only in two places, viz. near Monaltree in Aberdeenshire, where it is contained in a small vein of galena or leadglance which traverses granite; and in the island of Papa Stour, one of the Zetlands, in small quantity, in a trap rock %. It occurs much more abun dantly in England, being found in all the galena veins that traverse the coal formation in Cumberland and Durham; in great quantities, and often associated with galena, in veins or kidney, in floetz limestone in Derbyshire; and it is the most common vein-stone in the copper, tin, and lead veins, that traverse granite, clay-slate, &c. in Corn- 'vull and Devonshire. It is also a frequent mineral on the Continent of Europe, being generally associated with or »s of different kinds, either in beds or veins, but prin cipally in the latter: thus, in the Saxon Erzgebirge, it occurs in beds in primitive rocks, along with tinstone : ’d'K> in veins, along with silver and lead ores, and straight lamellar h.eavy-spar; and in veins of another formation, along with silver ores, cobalt,‘and nickel. In the lower *1'strict of (he llartz, there is a remarkable formation, great veins, which can be traced for ten or twelve Voi,. II. P miles * Kid, vol. i. p. 74. + Boumon deac.il.cs a specimen of ent.whites from nerl.vsl.irr, having '^“r.icti'vi above described.—Vid. got* Af.o. P- 't. ■t 'tincralogical Travel*, vol. li. !'• 207.