52 Elements of Mineralogy. 



with acids ; the proportion of mica is various. 

 The macigno of the Italians is of this fpecies. 

 Ferber, 1 16. The yellow fort is called pietra 

 bigia, the blue pietra colombina, or tur china. 



SPECIES V. 



Compounds of the Calcareous and Siliceous 

 Species. 



I. VARIETY. With Quartz. 

 I . Calcareous Quartz and Pnddingjlone. 



This confifts of lumps of quartz, and 

 fometimes felt fpar, in a calcareous cement. 



2. Limejlone with Veins of Quartz, Saxum 

 Sahlbergenfe. 



Alfo feveral marbles in Sweden and Siberia, 

 that ftrike fire with fteel. 



II; VARIETY. With Lava. 



1. Calcareous Volcanic Pudding/lone^ Cier china. 



In this, lumps of fpar and lava are found 

 in a calcareous cement. Ferber Italy, 1 1 5. 



2. Marble mixed with Veins of black or green 



Lava. Ferber Italy> 67. 



SPECIES VI. 



