^ 5 ^ 
A SYSTEM OF 
a. With an apyrus or refra6lory clay^ 
Argilld porcellaned. 
It is found under the flratum of 
coal in the coal-mine at Boferup in 
Skonej is of a loofe texture, but 
hardens, and is very refradory in the 
fire. 
I, With common clay, Argilld communt^ 
from Burfwick in the ifland of Gott- 
land. 
2 ., With lime, Lupis arenaceus glutine cal- 
careo ; refembles mortar made with 
coarfe fand. . 
a. Confiding of tranfparent and greenifh 
grains of quartz and white limedone 5 
from the ifland Ifo, near Beckafkog 
in Skone. 
b. Of no vifible particles, from France 
and Livonia. This is of a loofe tex- 
ture, and hardens in the air. 
3. With an unknown cement, Lapis are- 
naceus glutine incognito^ for fan argfllaceo, 
a, Loofe, from Helfmgberg in Skone. 
h. Harder, from Roflagen, Orfa, and 
Kinnekulle. 
c. Compad, from Gefle in the province 
of Gedrikeland, and the lake Malaren. 
d. Very hard, from Serna Fiell or Fells 
in Dalarne •, it is alfo found in great 
abundance in loofe dones at Gudavs^ 
drom, and at Siliamfors in the parifh 
of Mora in Dalarne. 
4. Cemented by the rud or ochre of iron. 
Lapis arenaceus cchrd martis. conglutinatus'. 
Is found in form of loofe dones at feveral 
places, and ought perhaps to be reckoned 
among 
