87 
TAB. CCXLIV. 
ARGENTUM muniatum. 
Crystallized Muriate of Silver. 
Class 3. Metals. Order 1. Homogeneous. 
Gen, _ Silver. Spec. Muriate of 
Div. 1. Crystallized, 
Spec. Cuar. Oxide of Silver combined with Mu- 
riatic Acid. 
Syn. Argentum corneum, Hornertz. Linn. ed. 13. 
ti. 3. 148. 
Mine d’ Argent cornée. De Lisle, t. 3. 463. 
Hornerz. Emmerl. 2. 168. ; 
Corneous Silver Ore. Kirw. 2. 117. 
Horn Silver. Babington, 150. 
Argent muriaté. Hauy, 3. 418. 
Tus valuable specimen was brought me by its owner 
John Williams jun., Esq., who had it from Mexico mine in 
Cuthbert parish, Cornwall, found at about eight fathoms 
depth. The crystals in this substance are always very small, 
but in the present specimen are very easily determined ; 
they are cubes and cubo-octaédrons, either regular or elon- 
gated, and more or less deeply truncated. They are in 
some parts distinct, in others more or less confusedly hud- 
dled together, others filling the hollows in smaller varieties, 
or confluent in them. The peculiar texture of this mineral 
has given it the apt name of Horn-Silver: it is, however, 
peculiar to itself, and rather like softened horn, inclining 
to waxy: hence it may be indented by the finger nail, and 
takes the impression of any equally hard substance. It 
feels less hard or harsh than horn in cutting, and receives 
by the instrument a waxy polish. The crystals break easily 
with an irregular conchoidal fracture, not unlike Quartz, 
but perhaps in a blunter manner, and shining like the 
