ORDER vn. PRISMATIC AXINITE. 



341 



Spain, near Ochotzk in Siberia, &c. Obsidian is very frequent 

 in Iceland, where it occurs in grains, angular pieces and 

 beds ; it is also found at Schemnitz and Glashutte in Hun- 

 gary, of a green colour at Moldauthein in Bohemia, and 

 shewing every stage of the passage into Pumice in the 

 Lipari islands, also in Teneriffe, Peru, and New Spain. 

 Pumice occurs at Vesuvius, in Ischia, the Lipari islands, 

 and several islands of the Grecian archipelago, in Tene- 

 riffe ; near Tokay, Schemnitz, and other places in Hun- 

 gary; near Andernach and the lake of Laach on the 

 Rhine ; in Quito and Mexico, &c. ; in several of these 

 countries it is met with also in conglomerates. 



5. Obsidian is employed for mirrors, vases, snuff-boxes, 

 &c. ; in Mexico and the island of Ascension very sharp edged 

 fragments are used as tools and weapons. Pumice yields a 

 well known material for grinding and polishing, and is also 

 employed as a filtering stone. 



GENUS VII. AXINITE. 

 1. PRISMATIC AXINITE. 



Prismatic Axinite. JAM. Syst Vol. I. p. 127. Man. p. 

 218. Axinite. PHILL. p. 43. Axinit. WEEN. Hoffm. 

 H. B. I. S. 678. Axinit. HATTSM. II. S. 626. Axinit. 

 LEOKH. S. 404. Axinite. HAUY. Traite', T. III. p. 

 22. TabL comp. p. 37- Traite', 2de Ed. T. II. p. 559. 



Fundamental form. Scalene four- sided pyramid, 

 the axis of which is inclined probably in the planes 

 of both diagonals. Vol. I. Fig. 42. 



