BEKGMANN1TE. 77 



though perfect parallel to P. Fracture uneven, 

 imperfect conchoidal. Surface, Ji striated parallel 

 to the edges of combination with J/, the vertical 

 prisms parallel to the axis. 



Lustre vitreous, inclining to resinous. Colour 

 white, greyish, yellowish, or greenish. Streak 

 white. Transparent ... translucent. 



Hardness = 4O. Sp. Gr. = 3-66, CHILDREN. 



It does not melt alone before the blowpipe, but gives a 

 clear globule with borax. It consists, according to Mr 

 CHILDREN, of 



Carbonate of Barytes 65-9. 

 Carbonate of Lime 33-6. 

 It sometimes gives traces of iron and manganese. 



It occurs in pretty considerable quantities at Alston 

 Moor in Cumberland, both massive and crystallised. 



The discovery of Baryto-Calcite is in particular favour- 

 able to shew the advantages of a systematic nomenclature. 

 Upon examining its characters and resemblance to other 

 species, it is immediately arranged with the genus Hal-ba- 

 ryte, and must therefore assume the denomination of the 

 hemi-prismatic Hal-baryte. 



BERGMANNITE. 



SPAR. 



Bergmannite. JAM. Man. p. 317- Var. of pyramidal Fel- 

 spar or Scapolite. Syst. VoL II. p. 43. Bergmannite. 

 PHILL. p. 200. 



Massive: composition thin columnar, or promiscuous. 

 Lustre pearly. Colour several tints of grey, pass- 

 ing into white and brick- red. Opake. 

 Not very brittle. Soft, passing into semi-hard, 



