TAB. XXVI, 



CALX Fluor primitiva. 

 Primitive crystallized Filiate of Lime; or Fluor*. 



EfSESWS" 



Class 1. Earth. Orel. 1. homogeneous. 

 Gen. 1. Lime. Spec. 3. Fluate of Lime. 



Div. 1. Crystallized. 



Syn. Chaux fluatee primitive. De Lisle, t. 2. p. \S* 

 Hauy, v. 2. 249. t. 31. f. 74. 

 Rashleigh, v. 1. t. 24. y. 1, 



Octaedral fluor is rare, as I have observed at t. xi of this 

 work. The upper figure of the present plate is from a spe- 

 cimen given me by the Right Honourable Charles Greville. 

 It is found at Beer Alston, in Devonshire. I have never 

 seen any of an opaque white but from thence ; and, which 

 is an addition to the curiosity of the specimen, the crystals 

 here are alternately opaque white and transparent green, 

 being as it were cased upon one another, 5, 6, or more 

 times. The transparent kind gives the usual vivid glow 

 when laid upon a hot poker, soon crackling and flying 

 away. The white part does neither, and will remain as a 

 defence to the next transparent part, until a stronger heat 

 bursts it. The matrix is commonly hornstone in apparently 

 broad strata, next to a sandy one on the side opposite to the 

 fluor; with considerable hollows, seemingly the impression? 



* Perhaps it is merely a carbonate of lime only. 



