ORDER VII. PYRAMIDAL ZIRCON. 369 



5. P - 1. P. (P) 3 . (P) 4 . P + oo. [P -f QD]. 

 Saualpe, Carinthia. 



6. P 1. P. (P) 3 . (P) 4 . (P) 5 . P+oo. 

 [P + oo]. Fig. 99. Saualpe. 



Irregular forms, grains. 



Cleavage, P and P -f- GO ; the latter more distinct, 

 but none of them of high degrees of perfection. 

 Fracture conchoidal, uneven. Surface ; P GO 

 very rough ; P 1 also rough, though less so 

 than P - oo ; [P + oo] often both rough and 

 uneven. The other faces are nearly all alike in 

 respect to their physical qualities, often particu- 

 larly smooth and shining ; the grains and 

 pebbles are uneven and often rough, but some- 

 times also very smooth. 



Lustre, more or less perfectly adamantine. Colour 

 red, brown, yellow, grey, green, white ; with 

 the exception of some red tints, none of them 

 are bright. Streak white. Transparent .., trans- 

 lucent, sometimes but faintly. 



Hardness = T5. Sp. Gr. = 4-505, of a crystal- 

 lised variety from the Saualpe, Carinthia. 



OBSERVATIONS. 



1. The reason why Hyacinth and Zircon have so long 

 been separated from each other as distinct species, we find 

 in the circumstance, that the specific gravity of Essonite 

 (p. 364.), to which the name of Hyacinth likewise had been 

 applied, was supposed to refer to those varieties of pyra- 

 midal Zircon, which possess the same colour, while the 

 specific gravity of the rest was known, and constituted one 

 of the characters of the species Zircon. But even after 



VOL. II. 2 A 



