FRIABLE URAN-OCHRE. 559 First Subspecies. Friable Uran-Ochre. Zerreibliche Uranocker, Werner. t’i'an oxyde pulverulent, Haup, t. iv. p. 285. kranocher, Ileuss, b. iv. s. 561. Id. Leonhard, Tabcl. s. 81. Id. Karslen, Tabel. • s. 74. External Characters. . It colour is straw-yellow, which passes sometimes in to sulphur-yellow and lemon-yellow; sometimes into yellowish brown and orange-yellow, and occasionally borders on aurora red. It occurs usually as a coating or elllorescence on pitch- ore. It is friable, and composed of dull, dusty, weakly soil-* > n g, anil weakly cohering particles. It feels meagre, and is Not particularly heavy. Geosnostic Situation. 45 »*• It occurs always on pitch-ore. Second Subspecies. Indurated Uran-Ochre. Feste Uranocker, Werner. Verhiirtete Uranochcr, Karsten, Tabcl. s. 74. External Characters. It has the same colours as the preceding subspecies. It