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1 412 TALC GENUS. frefh greenftone. May it not in this cafe rather be confidered as an original depofition of greenftone in a loofe ftate of aggregation, refembling the diftnteg- rated felfpar in certain beds of gneifs, &c. ? FIFTH SPECIES. Nephrite. Nephrit.—Werner. « This fpecies is by Werner divided into two fob- fpecies. i. Common Nephrite. 2. Axe ftone. first