MINERALOGY. 457 



Tin Ore Tin Stone is found in crystals, also mas- 

 sive and in grains. Colorless or yellowish-white verging 

 into wine color or hyacinthine^red, but mostly brown, 

 passing into pitch-black, with a high adamantine luster. 

 "When in crystals, transparent to translucent. Massive, 

 opaque, uniform and detached, infusible. H. = 6 to 7. 

 G. = 6.8 to 7. Found in veins in the granite, gneiss, 

 and mica slate rocks. The tin mines of Cornwall in Eng- 

 land are far-famed ; in Germany tin is worked in Saxony 

 at Altenburg, Zinnwald, etc. Occurs also in Austria, in 

 Malacca, Pegu, China, and in some of the East India 

 Islands. Spain, also, and Russia can boast of their trea- 

 sures of tin. The mines of Dalecarlia in Sweden are 

 scarcely less celebrated than those of Cornwall ; the lat- 

 ter is said to yield the best product of tin, except the 

 mines of Bohemia. In America tin is found in Chili, 

 Mexico, Brazil; in the United States is met with in 

 some of the gold mines of Virginia ; as native ore in 

 Massachusetts and New Hampshire.* Plate 32, fig. 5. 

 White Arsenic comes in white capillary crystals ; 

 mostly colorless, but often, when impure by admixture 

 with other substances, reddish or gray. Texture silky 

 luster metallic pearly, sub-transparent; taste astringent 

 sweetish, disagreeably metallic. Occurs also as fibrous, 

 slender stalactites ; when heated gives off a baneful nau- 

 seating odor, like that of garlic. Volatizes readily, but 

 does not dissolve easily in water. H. 3.0. G. = 3.6 



* The Cornwall miues are supposed to have been worked long 

 before the Christian era. The Phceuecians are allowed to have traded 

 with Cornubia. Cornwall and Herodotus (four hundred and fifty 

 years before Christ) are believed to allude to the tin islands of Bri- 

 tain under the cabalistic name Cassiterides, derived from the Greek 

 kassiteros, signifying tin. DANA. Tr. 

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