292 CELKSTINE AND B ARYTO- CELESTI NE 01' CLIFTON. 





BY NORMAN COLLIE, 

 Student in the Chemical Lahoratory of TIniversity College, Bristol, 



SULPHATE of strontium or celestine, so called on account 

 of its blue colour, has long been known as one of the most 

 abundant minerals of this neighbourhood. 



Jn works written at the beginning of the century, Bristol is 

 mentioned as one of the few localities where it might be found. 

 Among other places where celestine has been obtained, are the 

 sulphur mines of Sicily, where line transparent prismatic crystals 

 occur associated with sulphur and gypsum, and it is in specimens 

 obtained from this district that the blue colour of the mineral is 

 most distinctly marked. In specimens found in the; British Isles 

 the colour is very faint, and often completely absent. Celestine is 

 also met with at Bex in Switzerland -, in the green marl of Mont- 

 martre near Paris, and in the British Isles, besides at Bristol, on the 

 Calton Hill Edinburgh, Strontian in Argyleshire, and in sandstone 

 at Inverness. 



At Clifton it occurs either crystalline or massive. The crystalline 

 variety is found in cavities in the limestone rock, and is sometimes 



