xvi M. Buongniart's Table 



Species 4. MELAPIIYRE. (Tiapporphyr, Werner.) 



A paste of black petrosiliceous hornblende containing fel- 

 spar crystals. Fusible into a black or grey enamel. 



Principal varieties. 



Demi-deuii. ^ Deep black with white crystals, & no quartz. 



(Venaison in the Vosges. Sweden.) 



Sanguine M Blackish, the crystals reddish, with grains 



of quartz. 

 (Niolo in Corsica.) 

 Green spotted M. . . . Reddish brown, with green crystals. 

 (Black antique porphyry.) 



Genus 9. WITH A BASE OF HORNBLENDE 

 PETROSILEX. 



The base is petrosilex coloured by hornblende, 

 which is as it were dissolved in it : it is not black. 



Species!. PORPHYRY. (^True porphyry. Jlornsiein 

 porphyr. Werner.) 



Paste of red or reddish* petrosilex, containing deter- 

 minable crystals of felspar. Fusible into a black or grey 

 enamel. 



Principal varieties. 



Antique P. Paste of a Tery deep red colour, with small 



crystals of white compact felspar. 



. Reddish brown P Paste of a reddish brown colour, with a little 



quartz. 

 (Planitz, — Kusseldorf. Lesterel.) 



Roseate P Paste of a pale red colour, numerous grains 



or crystals of quartz. 

 (Kunnersdorf in Saxony.) 

 Violet P. 

 Stenitic P. 



Specis 2. OPHITE. (Gree7i porphyry.) 



Paste of green hornblende petrosilex, containing deter- 

 minable crystals of felspar. 



* Leucostiue, Delametherie. 



