154 



PHYSIOGRAPHY. 



Crichtonite. 



3. It is found in many places in the Pyrenees, but chiefly comes fiorr 

 the valley of Vicdessos, passage of Aulus, at the bridge of the Taule, &c 



4. Further investigation is necessary to establish it as a distinct spe 

 cies. It resembles Feldspar. 



CRICHTONITE. Axotom ous Iron-Ore. MOHS, 

 Primary form. Rhomboid. P on P = 85 59'. 

 Secondary forms. 



Fig. 152. Fig. 154. 



PonP 



P on a 



Pon b 

 P on V 



m on m 

 m on o 



85 59' 

 127 40 



128 



122 

 61 

 97 



1 



28 

 20 

 12 



Irregular forms and grains. 



Cleavage, perfect parallel to , less distinct parallel with 

 P, and not always observable. Fracture conchoidal. Sur- 

 faces generally more rough than smooth, and nearly all oi 

 them alike. 



