298 Description of a New Mineral called Haytorite. 



" The crystals, which are generally large and well defined, 

 are of a brownish-red ferruginous yellow, and delicate white 

 colour. Every crystal has certain planes, smooth and splendent, 

 while the others are rough and dull, and is either semi-tran- 

 sparent or translucent. The substance scratches rock crystal, 

 and in lustre, colour, fracture, and general appearance, closely 

 resembles chalcedony." 



Mr Robert Cole, who examined the mineral along with Mr 

 Tripe, agrees with him in regarding it as crystallized chalce- 

 dony, but considering it probable that it may be a new sub- 

 stance, they contemplated calling it Haytorite, in honour of its 

 birth-place. 



Mr Phillips has made the following observations upon Hay- 

 torite : 



" It has only been found in regular crystals, which in ge- 

 neral are well defined, the edges being sharp, and the planes for 

 the most part brilliant. In dimension they vary from the size 

 of a pin's head to an inch in diameter; three or four minute 

 crystals are colourless and almost perfectly transparent ; but in 

 general their colour passes from pale brownish-yellow, in which 

 case they are translucent, to deep brown and opaque. 



The crystals, however, have rarely been found isolated, be- 

 ing commonly grouped together in such a manner as to show 

 only about one half of the crystal, but they are easily separa- 

 ble ; the planes of separation are bright, and frequently some- 

 what iridescent on the surface. 



I have in vain attempted to discover a regular cleavage 

 which rarely is absent in crystallized minerals, and it is re- 

 markable, that the surface produced by breaking a crystal in 

 any direction, is almost totally devoid of lustre, having com- 

 pletely the aspect and fracture of chalcedony, and this takes 

 place even in the almost perfectly transparent crystals, which 

 lose immediately that character, assuming the same degree of 

 translucency as is commonly possessed by chalcedony when 

 viewed on the fractured surface. Spec. grav. of two crystals 

 taken by Mr S. L. Kent 2.5628, 2.5862. It scratches quartz. 



The characters detailed in the preceding sentence induced 

 the suspicion that it is only a pseudomorphous mineral. 



Whether such be its real character, or whether it is to be 



