OX CORDIERITE AS CONTACT MINERAL. 331 



the system of nomenclature above adopted is to be consistently 

 carried out, it would be necessary to have a new appellation for it, 

 to distinguish it from the ordinary form of Cordierite. For this 

 purpose, we propose the name of Cerasite,* from Kzpcuroî, cherry, 

 in allusion to the fanciful designation of ' Sakura-ishi ', by which it 

 is generally known in Japan. Gerasite is, then, that form of Cordierite 

 which has been produced by the so-called contact metamorphism of 

 Granite in slate, and is characterized by the constant and regular 

 form of the enclosure of the foreign materials, and the absence 

 or weakness of pleochroism. 



Other occurrences — Besides the localities already mentioned, there 

 have been discovered other occurrences of Cerasite, some of which may 

 be briefly noticed here. Pebbles of the contact-slate looking 

 like that from the Watarase-gawa region were found in Hokkaido by 

 Mr. K. Jimbo, to whom we are indebted for the following list of 

 localities as well as information regarding theim 



1. Raruishi, Hutorogori, Prov. Shiribeshi. 



2. SarurUj Horoizuniigori, Prov. Hidaka. 



3. Hurebets near Poronai, Esashigori, Prov. Kitami. 



4. Toshibets gold-field, Prov. Shiribeshi. 



5. Kenupchi, a branch of Teshio-gawa, Prow Teshio. 



In all these eases the slate is always found near the granitic 

 mass, but the exposures in situ have not vet been observed. The 

 specimens obtained from these localities are usually much altered into 

 a greenish mica. Under the microscope, they present nothing very 



* This name of Cerasite is sometimes defined as " native muriate of lead," on the 

 authority of Dana. The reference to the 'System' (p. 703) shows, however, that it is another 

 naine for PJiosgenite i Horriblei or Corneous leadj, otherwise known as Kerasine or Cerasine, which 

 is derived from the Greek Kt/nx, hunt. Ilence it is evident (hat Cerasite lias had no objective 

 bi^nificance. 



