♦ Silica Genus. 8 Kinds. Species. C5 a. O '56 Menilithe. 57 Pitch-stone. 58 Obsidiane. ° •<{ 59 Pearl-stone. :5 s 60 Pumice. CG 61 Silica-sinter. a. Common. b. Precious. c. Marecanite. a. Common. ! b. Glassy. a. Common. b. Pearly. '62 Prehnite. 63 Zeolithc. 64 Mesotype. 65 Apophyllite. | 66 Stilbite. fet 67 Chabasie. 68 Analcime. 69 Lommonit. 70 Dipyre. 71 Natrolithe. 72 Harmotome. [_73 Datholithe. a. Fibrous. b. Lamellar. a. Earthy. b. Compact. c. Granular. d. Glassy. a. Fibrous. b. Acicular. c. Prismatic. 74 Lapis Lazuli. 75 Lazulithe. 76 Bluestone. 77 Hauyne. 78 Elaolithe. -S 4 B. B ~ p „<u fa" '79 Andalusite. 80 Felspar. a. Compact. b. Common. c. Labrador.