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CROSS-STONE. 827 Gcognoslic and Geographic Situations. It has been hitherto found only in mineral veins and in agate balls. At Andreasberg in the Ilartz, it occurs in veins that traverse transition rocks, along with quartz, calcareous-spar, galena or lead-glance, copper pyrites, iron-pyrites, and grey copper ore; and of all the mate rials of the veins, it is the newest. The mining district °f Kongsberg in Norway, which is situated in primitive strata of mica-slate and hornblende-slate, is traversed by numerous metalliferous veins, containing native silver, °resof silver, lead, zinc, arsenic, and iron, and vein-stones of calcareous-spcr, heavy-spar, common quartz, and rock- crystal, ami sometimes of adularia, zeolite, axinite, chlo rite, mountain-cork, fluor-spar, schorl, brown-spar, and cross-stone. Strontian in Argyleshire is the only other Place where it has been observed in veins. At Oberstein it occurs in single crystals, along with chabasite, in agate kalis. Observations. 1- This is a simple species: its distinguishing charac ters are, the twin form of its crystals, its kind of lustre, fracture, hardness, and weight. It is allied to Radiated Zeolite; but it is distin guished from it bv its twin crystals, vitreous lustre, greater hardness and weight, insolubility in acids, and infusibility before the blbwpipe. 7. La u men it e.