FLUOR SPAR. 
GENERIC CHARACTER. 
Calcareous earth united to a particular acid, which when 
extricated corrodes glass. 
Decrepitates with a moderate heat. 
Melts in clay crucibles at ISO 0 of Wedgewood’s thermo- 
meter. 
SPECIFIC CHARACTER. 
Fluor cubicus. FI. subdurus nitens laevis lamellosus fragilis in 
fragmenta pyramidalia dissiliens, cubicus. 
Linn. Syst. Nat. Gmel. 3. p. 128. no, 5. 
Crystallized in cubes, moderately hard, with 
a smooth shining surface ; crystals brittle ; 
fracture foliated, breaking into pyramidal 
fragments. 
Crystallized Fluor. Cronst. Min.l. p.43. 
sect. 25. 
Fluor crystallisatus rhomboidalis. Waller. Syst. 
Miner. 1. 1 76. no. 4. a. 
FluorSpar. . Kir wan. Miner. 1 , p. 127. Patrin. Hist. Nat. 
des Miner. 3. p. 225. pi. at p. 22/. Brongn. 
Miner. 1 . p. 243. 
This beautiful kind of spar generally crystallizes in 
the form of a perfect cube ; sometimes it is found 
with eight sides, but more frequently between the 
