16 TYPE MINERALS. : 
MAGNESIA. : 
433 Magnesite. Silesia. 
434 Carbonate of Magnesia. N, America. 
ALUMINA. 
435 Alumite—Alumstone. Hungary. 
436 Wavellite—Phosphate of Alumina. Bohemia. 
437 » ? 2? > 
438 nA a _ 5 “Nassau. 
439 Turquois. Ceylon. 
ZIRCONIA, 
440 Wohlerite. Norway. 
CLASS IV. Earrus—Silica, Alumina, Magnesia, and their | 
Hydrates, 
SILICA. 
441 Rock Crystal. Madagascar. 
442 Smoky Quartz, with Iridescent Specular Iron. 
Cumberland. 
443 Crystals of Quartz. St. Agnes, Cornwall. 
444 Chalcedony—vyariety of Quartz Iceland. 
445 Quartz, crystallized. 
446 Rose Quartz. Bavaria. 
447 Ice Quartz, with Oxide of Manganese. Cornwall. | 
448 Silicified wood. Kowhai R., Mt. Grey, Canterbury. 
449 + x) polished section. Antigua, W. 
Indies. 
450 Moss Agate. Rhenish Prussia. | 
451 Jasper. Tyrol. | 
452 Ribbon Jasper. India. 
453 Double hexahedral Pyramids of Quartz. | 
454 Chrysoprase. Silesia. 
455 Hornstone. Tyrol. 
456 Lydian Stone. Saxony. 
457 Amethystine Quartz. Tyrol. 
458 Chalcedonic Quartz—Carnelian, E. Indies, 


