DESCRIPTION AUtf ANACYSIS OF YENlTEi 143 



This agreement between the results obtained by these two 

 skilful chemists, who operated on the stone at the same 

 time, and unknown to each other, gives these analyses as 

 high a degree of certainty as could be wished ; and author- 

 ises us to conclude, that the yenite, at least in those speci- 

 mens analysed, contains rather more than half its weight of 

 iron, mixed with a little manganese, and that the rest of the 

 stone is lime and silex, the proportion of silex being consi- 

 derably more than double that of the lime. 



Situation and local circumstances-. 



I found the yenite in two different places in the island of Where fouud. 

 Elba; at Rio-la-Marine, and at Cape Calamite. 



In the first of these it forms part of a very thick mass or Its situation ift 

 Stratum, resting on a primitive limestone mixed with talc ^ ^^ ^^'^ ^' 

 (a kind of cipolin marble) ; the whole exhibiting a cliff, or 

 bare perpendicular rock, about thirty yards high. It is im- 

 bedded in the green substance, which I have mentioned as 

 bearing considerable analogy to it, in masses that reach to 

 the size of a few cubic decimetres [tlie dec. is near 4 inches], 

 and frequently form the sides of cracks in the rock. These 

 masses are most frequently composed of distinct pieces, and 

 in each of these pieces the mineral is in radii diverging from 

 a centre. Sometimes the radii are nearly parallel, and so 

 conjoined together, as to exhibit compact masses, which di- 

 vide into shapeless prisms like certain basaltes. At other 

 times the radii, particularly when their extremities are free, 

 terminate in true crystals. Frequently the yenite appears 

 in long pieces, or imperfect prisms, of the size of a man's 

 finger, and sometimes even much more slender, in the midst 

 of the green substance ; from which it is very distinct, their 

 limits being always decidedly marked. Frequently too it is 

 found in cavities of this substance, in crystals sometimes 

 with a polyedral summit at each extremity, and 3 or even 4 

 cent, [l inch or if] long; sometimes they are solitary, at 

 others variously grouped. The stratum that has been m^en- 

 tioned includes likewise epidote of a fine yellowish green, 

 quartz, some crystals of arsenical iron, and that variety of 

 amorphous oxidnlated iron called loadstone. 



At Cape Calamite the yenite is found in the same sub- 

 stance, 



