184 PHYSIOGRAPHY;'. 



It has been divided into two kinds, the friable, and the 

 solid or indurated Litkomarge. 



It does not fall to pieces when thrown into water ; and 

 hardens if exposed to a strong heat. It occurs in various 

 parts of Saxony, as in tin-veins at Bobershau and Alten- 

 berg ; in porphyry at Rochlitz ; in the coal measures at 

 Planitz near Zwickau, where the variety called Terra mi- 

 raculosa Saxonice is found ; in the drusy cavities of the To- 

 paz-rock at Auerbach ; in serpentine at Zoblitz ; in trap 

 in the county of Antrim in Ireland, &c. 



MOUNTAIN SOAP. 



Mountain Soap. JAM. Syst. Vol. II. p. 74. Man. p. 312. 

 Bole. PHILL. p. 53. 



Massive. Composition impalpable. Fracture fine 

 earthy. 



Dull. Colour light brownish-black. Streak shin- 

 ing, resinous. Opake. 



Perfectly sectile. Does not soil, but writes, adheres 

 strongly to the tongue, feels very greasy, is very 

 soft, and light, approaching to not particularly 

 heavy. 



It has been found at Olkucz in Poland, and is a very 

 rare mineral. 



POLISHING SLATE. 



Polier or Polishing Slate. JAM. Vol. II. p. 70. Man. p. 

 425. Polishing-slate. PHILL. p. 51. 



Massive. Composition impalpable. Principal frac- 

 ture slaty, thin and straight, cross fracture fine 

 earthy. 



Colour yellowish-grey, inclining to white or brown. 



Feels fine, but meagre, adheres but little or not at 



