VAUQUELINITE. 1G7 



Scratches ftubr pretty readily, but yields to the 

 knife. 



According to the experiments of Mr CHILDREN, it con- 

 sists chiefly of alumina, lime, magnesia, and a little iron, 

 but very little silica, and no titanium. It was formerly 

 confounded with prismatic Titanium-ore, but is said to have 

 afterwards been distinguished from it under the name of 

 Pictite. Its locality is Mount Sorel in Dauphiny, where 

 it is accompanied by rhombohedral Quartz, prismatic Feld- 

 spar, Albite, Crichtonite, and pyramidal Titanium-ore. 



VAUQUELINITE. : ; 



MALACHITE ? 



Vauquelinit. LEONH. S. 248. Vauquelinite. Chromate 

 of Liead and Copper. PHILL. p. 350. 



Henri-prismatic. Minute crystals, nearly resem- 

 bling Fig. 59., with the obtuse edges oa re- 

 placed, compressed between P and P, and join- 

 ed in regular compositions, parallei to a plane, 

 which passes through the crystals in the direc- 

 tion of ee, and intersects the acute lateral edges. 

 Inclination of P on P', from the other indivi- 

 dual, nearly = 134 3& ; of the edge oa, or its 

 replacement, on P, about 149. 



Fracture uneven. Surface, P smooth and even, 

 the rest of the faces a little curved. 



Lustre adamantine, often faint. Colour blackish- 

 green, olive-green. Streak siskin-green, often 

 inclining to brown. Faintly translucent, with a 

 fine olive-green tint, opake. 



Rather brittle. Hardness = 2-5 ... 3-0. Sp. Gr. 

 = 5-5 ... 5*78, LEONH ARD. 



