135 



TAB. CCCLXXII 



CALX phosphata. 

 Phosphate of Lime with Garnets, 



Div. 2. Imitative, (fibrous.) 



1 his substance, which I have received from the neigh- 

 bourhood of Aberdeen, by favour of several friends, as a 

 phosphorescent Granite, appears to be a fibrous Phosphate 

 of Lime with Garnets, either decomposing, or not so per- 

 fectly formed as usual, but showing plainly the Garnet do- 

 decaedron more or less interrupted by the Phosphate of 

 Lime. Mr. Jackson, F. L. S., found some at Tierbagger 

 and Culterby, on the Dee side, near Aberdeen, and it is 

 certainly a curious production, not mentioned in any 

 British or even foreign authors. If a fragment be placed 

 on a hot iron or poker, it has the blueish glowing phos- 

 phorescent appearance of some of the Fluors. The Gar- 

 nets in this rock are sometimes so small as to be almost in- 

 visible : sometimes they appear only in the form of irregular 

 blotches; but occasionally they are more regular and not 

 attached to the rock, but only fill up a dodecaedral hollow, 

 and have then the appearance of the lower figure, yet seem 

 to be much mixed with the substance of the rock. The 

 Phosphate of Lime is in small bundles of fibres closely 

 matted together, of a pale blueish green in the most com- 

 pact parts, but whiter and even brownish near the surface, 

 where it is in a decomposing state. 



