SOME ACTIVE AND EXTINCT' VOLCANOES. VALUABLE MINERALS. latter 6 inches. There are a number of well-defined regions in this country where rock crystals are found and mining for them is carried on with more or less regularity most of the time. But the most remarkable ones have been found by chance rather than by any definite clew to their whereabouts. One of the well-defined regions where quartz crystals have been found in the past dozen years is at Hot Springs Colorad on the banks of the Ouachita. A remarkable feature about these stones is that they are so worn by the tide and cur though of a rather purer and higher grade. Trans parent quartz pebbles are frequently sold in cities under the name of imitation diamonds. They can be cut and polished to a rich brilliancy so that they attract nearly as much attention as the genuine stones but they soon lose their luster and cannot be retouched again without recutting. The various colored quartz crystals produce many fine specimens of stones which are used in the jewelry trade. Thus the amethyst is a transparent purple variety of quartz. Some varieties are so plentiful that they have lost much of their ancient value. The finest deep purple gems naturally command nearly as much attention as ever and when cut properly they sell for good prices. Small but very fine amethysts are now found in parts of Pennsylvania Maine and North Carolina. These stones are eagerly sought after and occasionally a large one is found which is valued nearly as much as those imported from the Orient. Agates and chalcedonies have also in recent years been mined in considerable quantities and variety in this country and their value is proportioned some what to the quality of their grain. The best agates are found in hard nodules where the rocks have dis integrated through one cause or another and conse quently they are strewn in places along the coasts and beds of streams. Agate pebbles which present rather a fine appearance and readily lend themselve
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