362 Count de Bournon on Bardiglione. 



out a more or less considerable portion of their extent. This variety, 

 as well as the preceding, is 'frequently observed among the crystals 

 of bardiglione from Hall. 



2. Fibrous. I have a small specimen of bardiglione from Hall, in 

 which the crystals, which are very thin, extremely brittle, and nearly 

 colourless, intersect each other in very different directions. In one 

 of the parts of the specimen, this substance exhibits itself in diver- 

 gent fasciculi, the fibres of which are of unequal lengths, and have 

 a glistening lustre, which gives them an appearance that has consi- 

 derable resemblance to that of the satiny coralliform arragonite. M. 

 Mohs, in his catalogue of the splendid mineralogical collection of 

 M. Von der Null of Vienna, mentions another variety of fibrous 

 bardiglione, which he says came from Ischel in Upper Austria, and 

 is of a colour intermediate between brick-red and blood-red. 



3. Globular. To this variety I believe should be referred the glo- 

 bules of different sizes, from that of a poppy seed to that of a large 

 pea, or still larger, which are met with in a rock of compact bardig- 

 lione mixed with sea-salt, known by the name of the Salt Rock of 

 Arbonne, and situated at a very considerable height, being a very 

 little distance from the region of perpetual snow near St. Maurice, 

 in the vicinity of Mont Blanc. These globules are distinguishable 

 from the compact bardiglione in which they are included, not only 

 by their figure, but by their brown colour, that of the mass being 

 grey, or reddish. Their substance is mixed in like manner with 

 sea-salt. They are much more fusible before the blowpipe. 



Lamellar Bardiglione, 

 1. With large lanmia^ lying in the same direction. Such is the tex- 



