r 40 ] 
fhewn when we come to the 
Value. 
precious Stones cf 
Apyri. Sulphura. 
In this Repofitory are many Specimens of thofe 
Stones that refill Fire, and of the different Kinds 
of Sulphurs, or inflammable Minerals. 
Apyri are cpake rough Stones, fo called from 
their refilling an intenfe Heat, and yielding neither 
Smoke nor Sparkles in the Fire. 1 lhall mention 
feme pf the Kinds : and firft—. 
Lapis Ollaris. This is a foft Stone, and may be 
Cut or turned into Vefifeis of different Forms. 
Mica is a brittle Stone, on which, when broke, 
are to be feen fmall white pelifhed Lamina, as in 
Talc. The Mica Aurea is frequently found in Ara¬ 
bia, Egypt, and other Saltern Parts of the World ^ 
the Mica Argentea in Silejia and Bohemia, and both 
of them fometimes in England. 
Talc is a fhining Stone, eafily feparated into thin 
tranfparent Scales cr Leaves, commonly called 
Mufcovy Glafs. The Romans ufed it in their Win¬ 
dows •, and it now often ferves to cover miniature 
Paintings in Water Colours, or Crayons. 
Amianthus. This is of the Clafs of the Fihraria ; 
it is an opake brownilh Stone, compofed of fnort 
and abrupt Filaments, flexile and elaftic, and eafily 
Separable into Plates, or other irregular Pieces. 
There are feveral Kinds of it; and it is chiefly 
found in Germany, France, and Egypt, and one Kind 
often in Torkjhire. 
Afbefios , the Cotton-ftone, is naturally of a white 
or Silver Colour, and confifts of fmall Fibres, of 
which may be made fine Threads, brittle, yet 
lomewhat tra&able: the Ancients had a Method 
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