374 Scientific Intelligence. 



Compound Varieties. Massive: composition granular, individuals 

 6trongly connected. 



Observations. — The prismatoidal Copper-glance lias been hitherto found 

 only in the beds of sparry-iron at St Gertraud, near Wolfsberg, in the 

 valley of Lavant, in Carinthia. It is very nearly allied to the follow- 

 ing species. It will depend upon future accurate examinations, parti- 

 cularly of its regular forms, whether or not the varieties of the two 

 species are identical. This species was determined by Professor Mohs, 

 before he was acquainted with any of the varieties of the Bournonite. 

 Though it is likely that they do not present any specific difference, it 

 would be too precipitate to unite them, without being capable of affording 

 a demonstration of their identity. 



Before the blow-pipe, the two species give very nearly the same results. 

 They both contain sulphur, antimony, lead, and copper ; but the prisma- 

 toidal copper-glance yields also a little silver, for the extraction of which it 

 is collected by the miners, without, however, properly speaking, being an 

 object of mining. (Mohs, vol. ii. p. 559 ; Transt. vol. iii. p. 4.) 



28. Axotomous Antimony-Glance, a New Mineral Species. 

 Prismatic. Simple forms. P + co = 101° 20' (nearly); Pr + oo. 



Combinations, of the preceding forms, their terminations not observed. 

 Cleavage, P — x highly perfect ; less distinct, though easily observed, 

 when the crystals are not too small, the prism P + » , and Pr + oc the 

 plane parallel to the short diagonal. Fracture not observable. Surface 

 deeply streaked, parallel to the axis of the prisms. Lustre metallic. Colour 

 steel-gray. Streak unchanged. Sectile. Hardness = 2.0 ...2.5 Sp. Gr. 

 = 5-564.. 



Compound Varieties. Massive : composition columnar, individuals ge- 

 nerally very delicate ; straight and parallel, or divergent. 



Observations. — Nothing as yet is known of the proportions among the 

 ingredients of the present species. It contains sulphur, antimony, and lead. 

 The axotomous Antimony-glance seems to be a rare mineral, or at least 

 not sufficiently attended to by mineralogists. It occurs in masses of con- 

 siderable dimensions in Cornwall, sometimes along with the diprismatic 

 Copper-glance, as in Huelboys. In Hungary it is engaged in rhombohe- 

 dral Limehaloide, but its locality is not exactly known. — {Mohs, vol. ii, 

 p. 586. Ti-ansh vol. iii. p. 26.) Mr Haidinger proposes for this species 

 the name of Jamesouite, in honour of Professor Jameson, who has so much 

 contributed to the present general diffusion of mineralogical knowledge. 



29. Hemiprismatic Ruby-Blende, a new Mineral Species. 

 Hemiprismatio. Fundamental form. Scalene four- sided pyramid. P = 



\ 121° % \ ' 130 ° 7 '' 7? ° 16 " Inclination of the axis = 11° 6', in the plane 

 of the long diagonal. Approx. (a : b : c : d = 5.1 : 9.5 : 8.7 : 1.) 



Combinations. 1. P— » (Z>). — - + X (t). P + <x (/). Fig. 14. 



