178 Scientific Intelligence. 



3d edit. Vol. II. p. 193.) They are in fact lenticular, compressed be- 

 tween the faces marked a* in the figure, which are somewhat rounded 



4 



and rough, and contains besides e 3 and g. Upon examining that spe- 

 cimen in comparison with the crystals of arseniate of cobalt, it was 

 clear that it belonged to a different species ; the establishment of which, 

 however, is entirely due to Mr. Levy, as it was impossible to detach 

 a crystal from that group for ascertaining its characters without too 

 much injuring the specimen. 



26. Columbite. — Dr. Torrey of New York has ascertained that Haddam, 

 in Connecticut, is the most likely locality of that variety of Columbite 

 which had been sent to Sir Hans Sloane by Governor Winthrop of Con- 

 necticut, and in vain sought for in the vicinity of New London, the 

 locality quoted. Count Trolle Wachtmeister first discovered that there 

 was tantalite in one of the specimens of the Haddam rock, containing 

 cymophane, beryl, &c. sent to him by Dr. Torrey. This was, however, 

 only a very small quantity. Dr. Torrey found lately amorphous masses 

 half an inch in diameter, and smaller crystals, which arc very perfect, 

 and engaged in the red garnet, which has been found by Mr. Seybert 

 to contain 30 p. cent, of manganese. These crystals are frequently asso- 

 ciated with cymophane, as is the case in a specimen of the latter in Mr. 

 Allan's cabinet. (Ann. of the Lyceum of Nat. Hist. New York. J 



27. Brochantite, a New Mineral Substance — Form, prismatic. Crystal- 

 lization observed similar to Plate III. Fig. 31. Inclination of a' on a' = 

 150° 30', of M on M = 114° 20, of t 4 on e 4 (adjacent) = 63° 0'. Faint 

 indications of cleavage in the direction of M. Surface of M blackish and 

 dull, the rest of the faces brilliant, and fit for measurement by reflexion. 

 Colour, emerald green. Transparent. Hardness, about the same as that 

 of green carbonate of copper. It has been described by Mr. Levy, who 

 measured the angles of the crystals by means of the reflective goniome- 

 ter, and named it in honour of Mr. Brochant at the suggestion of Mr. 

 Heuland. It occurs in very minute crystals on mamillated green car- 

 bonate of copper, lying upon massive red copper, from the bank mine, 

 Ekatherinaburgh, Siberia. 



According to Mr. Children's experiments, upon a very small quantity, 

 before the blowpipe, it consists chiefly of sulphuric acid, and oxide of 

 copper ; but on account of its perfect insolubility in water, he is of opi- 

 nion that it must contain some other substance beside these, which from 

 some appearances while trying it with salt of phosphorus, might be 

 silica or alumina, or perhaps both. It gives no signs of arsenic, phos- 

 phorus, lime, magnesia, manganese or iron, though Ukewise tried in the 

 humid way. 



28. Fluellite, a New Mineral Substance.- Form, prismatic. Combina- 

 tion observed an acute scalene four-sided pyramid, having its most acute 

 solid angles taken off, Plate III. Fig. 32. Angles = 1 09", 89.°, 144, 

 (nearly,) the transverse section, therefore, nearly 105°, according to Dr. 



G 



