J38 DOMAIN IX. ANOMALOUS. 



NOME XIX. BARYTIC ROCK. 



Mr. Kirvvan informs us, that Hoepfner disco- 

 vered a whole mountain in Swisserland, composed 

 of quartz, barytes, and mica partly compounded 

 with shorl. Mr. Kirwan calls this kind of ba- 

 rytes, baroselenite ; because it resembles selenite, 

 or gypsum crystallised in plates. It is the plane, 

 laminar, heavy spar of Werner, in which the 

 most common colours are white and red. In 

 the curious rock here mentioned, the barytes 

 was of a flesh red colour ; but it must not be 

 forgotten that Hoepfner's observations and ana- 

 lyses are not of the first authority ; and his ba- 

 rytes may be found to be a felspar. 



In the mineralogy of the department of the 

 Loire, there is the following account of a singular 

 rock near Ambierle, a village near three leagues 

 N. W. of Roanne*. 



" There is there seen a rock, situated between 

 two little valleys, on .the eastern side of the hill. 

 This rock, which separates these two valleys, is 

 a disordered mass, composed of fluor and barytes, 

 sometimes mixed, sometimes in separate and dis- 

 tinct parts, but always in intimate contact, and 



* Journal des Mines, iv. 127, by Passinges. 



