NATIVE SULPHURIC ACID. 



druses, incrustations, and nodules, an inch 

 thick, and is partly disseminated in veins. 

 Solfatara, near Naples. Crater of Vulcano. 

 Bex, in Switzerland. Cracow, in Poland. 

 Spain, three miles east of Conil, near Cape 

 Trafalgar, in ver}^ fine crystals, in cavities 

 in Gypsum and clay, and in limestone of 

 comparatively recent age ; also at Teruel, in 

 Aragon, replacing the tests of shells which 

 abound in certain bluish marls. Malvesi, 

 near Narbonne, in France, in eocene gypsi- 

 ferous marls. Pulverulent at Poligny, in 

 the Jura, in silex. Saint-Boes, near Orthez 

 in the Basses Pyrenees, near the junction 

 of Chalk and Tertiary strata, and near 

 Ophite. In Tertiary strata at Radoboj , 

 in Croatia. Bagneres -de - Luchon, and 

 Aix-la-Chapelle, forming incrustations 

 on the "walls of galleries from thermal 

 waters. Iceland, deposited from hot springs. 

 Guadaloupe. Martinique. Bourbon. Java. 

 Upper Egypt. Quito, in a bed of Quartz, in 

 mica-slate,andalso in porphyry. Schwarz- 

 wald, in Suabia, in veins of Copper Pyrites, 

 traversing granite. New York, Virginia, 

 N. Carolina, U. S. Hawaii, at Kilauea, con- 

 taining Selenium. 



Brit. Mus., Case 5. 



31. P. G. I-Iorse-shoe Case, Nos. 118, 

 to 147 ; Upper Gallery, Wall-case 1, No. 42 

 (Hawaii); 145 (Teneriffe); Table-case A, 

 in Recess 4, Nos 6 and 7. 



Native Sulphuric Acid, Phillips. Has 

 been found in a diluted state in the neigh- 

 bourhood of several volcanoes. It is a co- 

 lourless liquid, with a pungent smell, and 

 an intensely acid taste. S.G. 1*85. 



It occurs in the cavities of Zocolino, a 

 small volcanic mountain, near Sienna; in 

 the caverns of Etna ; and in a cavern near 

 Aix, in Savoy ; also in the United States, 

 at Alabama ; New York ; at Tuscarora, Chip- 

 pewa, and St. David's, Canada, West. 



Brit. Mus., Case 5. 



Native Sylvan, Jameson. See Nath'-e 

 Telluriuji. 



Native Talc Earth, Jameson. Native 

 carbonate of magnesia. See Magisesite. 



Native Tellurium. Hexagonal : pri- 

 mary form an acute rhombohedron. Occurs 

 in six-sided prisms, with the terminal edges 



Fig. 307. 



\^ 



replaced by single planes, generally massive 

 and granular. Colour and streak tin-white, 



NATROLITE. 255 



passing into lead-grey. Lustre metallic, 

 shining. Brittle. Yields to the knife. H. 2 

 to 2-5. S.G. G-1 to 6-3. 



Comp. Pure tellurium, or Te, containing 

 small quantities of iron and gold. 



BB tuses readily, burns with a greenish 

 flame, and almost entirely volatilizes in 

 dense white vapours. 



Soluble in muriatic acid. 



Localities. The Maria Loretto Mine, near 

 Zalathna, in Transylvania, in veins travers- 

 ing sandstone, and associated with Iron 

 Pyrites, Quartz, and Gold. 



Name. Erom Tellus, the Earth. 



Brit. Mus., Case 3. 



This is now a scarce mineral, but about 

 fifty years ago it was found rather abun- 

 dantly, and was smelted for the sake of the 

 gold it contained, amounting to about 2-75 

 per cent. 



Native Tin. Is said to occur (mixed 

 with some lead) in small greyish- white me- 

 tallic grains with the gold of Siberia. 



Natro-boro-calcite. See Hayesixe. 



Natrocalcite. a pseudomorphous 

 variety of Calcite, after Gaylussite, from 

 Sangerhausen, in Prussia. 



Analysis, by Mnrchand : 



Carbonate of lime . . 94-37 

 Alumina and peroxide of 



iron 1-15 



Sulphate of lime . . . 2-02 



Water 1-34 



Matrix 1-10 



99-98 

 Natrolite, Jameson. Natrolith, TTai- 

 dinger, v. Kohell, Naumann. Rhombic : pri- 

 mary form a right rhombic prism. Generally 

 in slender or acicular crystals ; also in mam- 

 millary masses, with a radiating fibrous 

 structure Colour white, or yellowish, grey- 

 ish, or reddish -brown. Lustre vitreous, in- 

 clining to pearly in fibrous varieties. Trans- 

 parent to translucent. Streak white. Brittle. 

 Fracture uneven, conchoidal. H. 5 to 5-5. 

 S.G. 2-2. 



Fig. 308. 



Comp. Na' Si+Al Si + 2H=silic.a 47-4, 

 alumina 26-9, soda 16-2, water 9-5 = 100. 



Analysis, from Dumbarton Moor, by 

 Heddle : 



