49 
TAB. CCXXV. | 
ARGILLA cyanea. 
Cyanite. 
Div. 1. Crystallized. 
Syn. Sappare. Saussure, Journal de Physique, Mars 
1789. 213. Kirw: 1. 209. 
Cyanit. Lmmerl. 1. 412. 
Disthéne. Hawy, 3, 220. 
Tuts beautiful and curious substance is said generally to 
occur in primitive mountains abroad, and in Scotland. The 
present specimen, from near the Grampian Hills, Kincar- 
dineshire, is nearly of the best or deepest colour: few are 
deeper; and specimens are occasionally almost colourless. 
We do not approve the name of Kzanite or Cyanite, taken 
from its colour, as it does not serve to distinguish this 
species from other blue minerals. The name Sappare also — 
confounds it with Sapphire; and again, Cyanite is very 
similarly sounded, by some, to Sienite, which is an aggre- 
gate. We have placed this stone in the genus Argilla, to 
which analysis plainly shows that it belongs; and we have 
also made use of Cyanite as its trivial name, for it is 
scarcely known by any other. We have quoted a part of 
Haiiy’s description, as most applicable to the substance. 
The crystals may be divided by two cuts inclined upon one 
another, at an angle of about 103°, one of which is much 
neater than the other. Spec. Grav. 3°517. A very sharp, 
VOL. Lt. E 
