Manual of Mineralogy: Including Observations On Mines, Rocks, Reduction of ...
Manual of Mineralogy: Including Observations On Mines, Rocks, Reduction of ...
James Dwight Dana
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How is topaz distinguished from tourmaline and other minerals 1 How does topaz occur? TOFAZ. 19§ Cornwall, etc,, aflferd smaller crystals. The {^ysalite varie* ty occurs in crystals of immense size at Finbo, Sweden, in a granite quarry, and at Broddbo, in a boulder. A well de&ied crystal from this locality, in the possession of the College of Mines of Stockholm, weighs eighty pounds. Al- tenberg in Saxony, is the principal locality of pycnite. It is there associated with quartz and mica. Trumbu...ll, Conn., is the principal locality of this species in the United States. It seldom affords fine transparent crystals, except of a small size : these are usually white ; occa- sionally with a tinge of green or yellow. The large coarse crystals sometimes attain a diameter of several inches, (rarely six or seven,) but they are deficient in luster. Usually of a dull yellow color, though occasionally white, and often are nearly opaque. The ancient topazion was found on an island in the Red Sea, which was often surrounded with fog, and therefore difficult to find.
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