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342 NATIVE METALS AND YELLOW TELLURIUM. Weiss Sylvanerz, W. Weiss Tullur. Gelberz, I,. Mullerine, Nicker- Tellure Aurifere and Plombifere, H. Union of tellurium, gold, and lead. Tellurium 44-75 26-75 19-50 8-50 0-50—Klaproth. Gold Lead Silver Sulphur Sp. Gr. 8-9—10-67. Soft. Silver-white, passing into brass-yellow. Primary a right rhom bic prism of 105° 30', and 74° 30'. Occurs in small but well-de fined crystals; possesses a bright metallic lustre ; and is some what sectile. Before the blowpipe it covers the charcoal with oxide of lead, melts into a white metallic globule, and emits a pungent odour. Soluble in nitric acid, leaving a yellow metal lic residue. Primary. M M M on M 105“ 30' P on M or/... 90 00 M on/. 142 30 h 127 30 a on /. 161 30 c on h 126 55 a 123 30| This very rare mineral occurs at Nagyag in Transylvania, in irregular veins in porphyry, with gold, native arsenic, sulphuret of manganese, and black tellurium; also in the Altai Mountains, Siberia. BLACK TELLURIUM. Nagyagererz, W. Tellure Natif Auro-Plombifere, H. Pyramidal Tellurium Glance, M. lilattertellur, Ilaus. Foliated Tellurium, A- Telluro-Cialene, Neckcr. Klasmose, Ikudant. Combination of tellurium, lead, gold, and sulphur. -p ,, . Na Kyag- Nagvag. Nagyag. Tellurium 32-2 26-40 1P0 Lead 54.-0 40-00 63-1 Gold 9-0 7.50 6-7 Silver o-5 0 00 0-0 Co PPer 1-3 1-00 1-0 Sulphur 3-0 2-50 11-7 Antimony 0-0 0-00 4-5 Klaproth. Brandes. Berthier. Sp. Gr. 7-0—7-2. II. = 1-0—1-5.