MINERALOGY. 
117 
6. In th”i veiy moment of fuilon it gives a 
phofphorus or light. 
SECT. GIX. 
The zeolites is found in an indurated ftate. 
I. Solid, or of no vifible particles. Zeolites [0- 
lidus 'partlculis impal'pahUibus, 
A, Pure, Zeolites durusJ 
a. White, from Iceland. 
B. Mixed with fiiver and iron. 
a. Blue, Lapis lazuli^ from the Buckarian 
Calm licks. 
This, by experiments made with it, 
has difcovered the following proper- 
ties. 
1. It retains for a long time its blue in 
a calcining heat, but is at laft changed 
into a brown colour. 
2. It melts eafily in the fire to a white 
frothy flag •, which, when expofed to 
the flame of a blow-pipe, is greatly 
puffed up, but in a covered veffel, 
and with a flironger heat, becomes 
clear and folid, with blue clouds in 
it. 
It does not ferment with acids : 
but, 
4. Boiled in the oil of vitriol, it dif- 
folves flowiy, and lofes its blue co- 
lour. 
When a fixed alcali is added to this 
folution, a white earth is precipitated, 
which being fcorified with borax, yields 
a fiiver regulus, that varies in big- 
' nefs, according to the various famples 
of the ftone. 
I 3 5. By 
