of Mixed Rocks. xiife 



Genus 5. WITH A SERPENTINE BASE. 



Species \. OPHIOLITE.* 



A paste of serpentine enveloping disseminafed oxidulated 

 iron and other accessory minerals. The structure compact. 



Principal varieties. 



Ferhiferous O With disseminated grains of oxidulated iron. 



Chromiferous O With disseminated grains of chromate of iron. 



DiALLAGic O With disseminated diallage. 



(Baste, in the Hartz.) 

 Garnet O With disseminated garnets. 



Genus 6. WITH A LIMESTONE BASE. 

 Species 1. CIPOLIN.+ 



A base of gaccharine limestone containing mica as a con- 

 stituent and essential part. The structure saccharine, often 

 fissile. 



(Pyrenees. — Schmalzgrube in Saxony.) 



Species 2. OPHICALCE. 



Base of limestone with serpentine, talc, or chlorite. The 

 structure imbedded, (Structure empatee.) 



Principal varieties. 



Reticulated O Egg-shaped nodules of compact limestone 



pressed against each other, and united as 

 it were by a net- work of talcose serpentine. 

 " (Marbre de Campan. Fuistenberg in the 

 Hartz.) 



Veined O Irregular patches of limestone, separated and 



traversed by veins of talc, serpentine, and 

 limestone. 

 (Vert Antique. Vert de Mer, Vert de Suza.) 



Granular O Talc or serpentine disseminated in a saccha.., 



tine limestone. 



* The greater part of common serpentines, potstones, &c. Noble ser- 

 pentine should constitute a single mineralogical species. 



f In order to shew the difference we make between pure saccharine 

 limestone, and llie rock with a limestone base which we name Cipolin, 

 we shall state that cipolin often occurs subordinate to saccharine lime- 

 btone. 



