pn a fine violet fluor matrix, fias been
recently found.
MalFes of lead, perfectly malleable, but
very much coroded, are fometimes, though
very rarely, foupd in old mines. They appear
flaladitic. At an early period the miners
made fires in the mines to melt the lead
ore in the veins, and this fubftance may
probably have remained there ever fince.
The antimoniated lead ore runs, like
net work, in filaments ciirioufiy interwoven,
and is fometimes accompanied with indurated
bitumen. This kind i§ rarely ii>
defcent.
A moft beautiful iridefcent variety is
fometimes met with in odaedrons, the
colours being very vivid at firft ; hut they are
fubjed tp tarnifli apd lopfe their beauty, by
expofurp to the atmofphere, This variety
is generally attended with cryftallizcd fluor,
affixed to its furfacp.
Sometimef
Sometimes a variety of carbonate of lead
occurs, which does not adhere to the galena.
Mafles have been found of a horn colour,
femi tranfparent, and finely cryftallized on
the furface,
Muriate of lead in perfed cryftals pf a
beautiful tranfparent yellow colour.
What is called glafs lead, appears as if
it had undergone the adion of fire; is
tranfparent, and fometimes cryftallized; but
in other inftances is of an opake, waxy
white. It is eafily melted by the blow
pipe.
bhodul.es o f carbonated lead have alfo been
found, formed by a combination of prifms,
acicular, fibrous, and interwoven, fometimes
of a eonfiderable fize in loofe earth.
Other carbonated nodules found in a loofe
ferruginous earth, granular, and of a
Joining ipicacepps fr^dpre, and eafily reduced