EARTHS. CALCAREOUS. 12. Spatum. 83 



5. Prifmatic, with the 2 oppoAte faces far exceeding the reft. 



6. Emiting a phofphorefcent light when burnt. 



Found in Derhyjlirey Hercsnioy Saxony ^ Sibfiay Hungary j and 

 Spairty in mines: generally white, and frequently tranlparent: 

 commonly aggregate, fcattercd, or in regular I'eries. 



dcdecaedron With 6-rided prifms, terminated at each end by a 3-rided 

 pyramid. 

 Gmel. fyst, yiat. 3. fs 445 . tah, I . fg, 1 1 . 

 Natrum lapidofum. isyst, nat. xii. 3. /»• 91* n. Ii. 

 Nitrum fpatofum. Muf 1 ejjtn. 26. tab. z,f. ^. 

 Spatum cryltallizdtum. WalLjyst. 1./. 143. «• 6. i. 



2. Pyramidal, with the margins truncate. 



3. Pyramydal, with the tips truncate. 



Natrum i4-edrum, Syst. nat, xii. 3. p, 86. «. 6. 

 Cryrtal. fubnitriform. Atnan acad^ l, p. 479. /. i6.y*. 17. 

 Spat, cryft. tetradecaed. Wall, fyst, i* 143. «.6. k. 



4. Pyramidal, with the faces convex. 



5. With a very fhort prifm. 



Born, ind.fofs. I. p. 5. tab. I. Jig. 2. 



6. With the cryftals aggregate in a globular form* 

 Tophus fpatofus, Syst, nat. xii. 3 p. 191. n. 19, 

 Spatum orbiculatum, MuJ. TeJJ^ 1 4. ». i . 



Found in the mines of Derbyjhirey Germany, Saxony, Hungary, 

 Sec. generally pellucid, rarely yellowifli or greenifh, moll 

 commonly white, with the pyramids fometimes depreffed ; 

 the cryftals fometimes thiner, fometimes thicker, frequently 

 in pairs cutting each other at ri'ghc angles, or cluftered in 

 regular feries, or in fafcicles or bundles, or in a globular 

 olive or pyramidal form. 



eBodeca- With 6-fidcd prlfms, terminated at each end by a 6-fided 

 edruiiu pyramid. 



2. With 6-fided prifms, terminated above with a 6-fidcd pyramid; 



tne margins of the pyramid incurved towards the prifm, 

 Freber 3 Briefe. /»• 50. 



3. With 6-fided prifms, terminated by a 6-fided pyramid, inr- 



verfely oppolite to itfelf in the middle part. 

 Freber 3 Briefe, p- S9» 

 Found in the mines of DerhyfJAre and Cumberland, and in Uer^ 



cynia, white or yellowifh ; the terminal pyramid iometimes 



augmented by another 5-fided pyramid. 



Hyodon. With a double 6-fided pyramid. 



Dog's tooth Ipar, Sonverby Brit, min, tab. l'if,'^<\,'^l» 

 Natrum lapidofum. 6y;/. nat, Xii* 3. /.,92. w, 13, 



L 2 



