Volltext Seite (XML)
278 Siliceous Genus. The red zeolite of Adelfors is generally ree- koned among the zeolites that ftrike fire with Iteel *; yet Mr. Bergman expreflly teils us it gives no lparks. Schwed. Abhandl. 1784, p. ne. And Svvab. 2 Mem. Swcd. p. 434. 2oth Species. Zeolite -f. Tts colour is white, yellowilh, or reddifh white, brick red, greenith, or blue. It is found both amorphous and cryftallized the lattcr in cubes, or hexahtedral paralelopepids* or tables, or cuneiform, or capillary, or in tri angulär pyramids { ; fometimes with 24 or 26 faces, &c. §. the former frequently in a mealy or fandy form. Its luftre, filky or pearly, 2.3.1. Tranfpa- rcncy, 2.3.4.I. Its texture, fibrous or flriated, often both in the fau.e fpetimen ,* either ftelliform, or fcopi- form; rarely foliated, and only when cryfiallized in hexaha-dial priims. Fragments, 2. Its hardneis, front 6 to 8; rarely 4. It abforbs from ^ to of its weight of water. Its fpeeihe gravity betöre abforption is from 2,0710 2,2x4; and, after abforption, from 2,13 102,3; but fometimes it is mixed with quartj or calcedony, and then may rife to 2,4, * ErHJ. p. n|2. 2 Berl. Beob. 2*1. + Born, l’hyf. Arbeitung 2 Stuck, p. 72. I Chy. Ann. i 79 o, p. 432. j Uoiom. on 3 Bcrgm. 245. It