24  Bringier on the Region of the Mississippi, 8c. 
riety (which is a non-descript) covers extensive vallies, upou 
which the pieces are scattered in piles, that are from three to 
four feet in diameter, and two in height. The colour pre- 
sents different shades of gray: the texture is earthy, although 
in some places exhibiting a chatoyant knob of various col- 
ours, having some resemblance to the cat’s eye. These 
_ colours are produced by the reflection of small prismatic 
crystals, filling up the places which had been left empty by 
some other substances, that must have expanded them- 
Ives, and occasioned the protuberances on the stone, and 
the alteration of its composition, which is in these places 
siliceous, resembling transparent white flint. This peculiar 
. 
tallic substances, for some are striped with black veins like 
__ While I speak of on-descript objects, or at least of what 
‘T have ; een described no where, I will mention a stone re- 
4 
x: s nted with very 
of any other mixture or colour. ae 
black ys 
ara 
pearance ¢ 
Not far 
‘ei. : 
Its fracture is foliated, and it soils the paper when rubbed 
on, leaving a metallic lustre. It affords from seventy te 
