WAVELLITE. SJD 1. Very oblique four-sided prism, flatly bevelled on the extremities, the bevelling planes set on the obtuse lateral edges. 2. The preceding figure, very deeply truncated on the obtuse lateral edges. Externally it is shining: internally shining, passing into splendent; and the lustre is pearly. The fracture is narrow radiated, and is scopiform or stellular diverging. The fragments are wedge-shaped. It occurs in distinct concretions, which are large and coarse granular, and sometimes concentric lamellar. It is translucent. It is so hard as to scratch quartz. It is brittle ; and Ilather heavy. Specific gravity, 2.270, Lucas. 2.22, 2.253, Gregor. 2.7, Davy. Chemical Characters. Tt becomes opaque and solt by the action of the blow pipe, but neither decrepitates nor fuses, lly the aid of heat it is soluble in the mineral acids and fixed alkalies, with effervescence, and leaves very little residue. CoMtituent Parts. Barnstaple Wavellite. Cornish WaveUite. Hualgayoe Wavellite. Alumina, 71.50 70.0 58.70 68.00 Oxide of Iron, 0.50 0.19 1.00 lame, 1A 0.37 Silica, 6.12 4,50 Water, 28.0 26.2 30.75 26.50 I.OSS, . • 3.87 100 100 97.6 100 Khp. Beit. Davy, Nichnl. Crcgar. Klap. Beit. b.iv. s.110. Jorur. xi. 157. b. v. s 111. It is said also to contain a small portion of Fluoric Acid. Geognostic
