EARTHS. CALCAREOUS. 12. Spatum. 
83 
5. Prifmatic, with the z oppofitc faces far exceeding the reft. 
6. Emiting a phofphorefcent light when burnt. 
Found in Derhyjbire, Hercynia, Saxony, Silefia, Hungary, and 
Spain, in mines: generally white, and frequently tranlparent: 
commonly aggregate, fcattered, or in regular fenes. 
^^ecaedron With 6-fided prifm.', terminated at each end by a 3-fided 
pyramid. 
Gmel. fyst. nat. 3. p, 445* tah, \ . fig. 1 1 . 
Natrum lapidofum. Syst. nat. xii. 3. /•9'« » 
Nicrum fpatofum. Muf d ejfin. 26. tab. z./i S- 
Spatum cryftallizatum. M'alL fist. i. p. I43" »• b, i. 
2. Pyramidal, with the margins truncate. 
3. Pyramydal, with the tips truncate. 
Natrum 14-edrum. Syst. nat, xii. 3. p. 86. «. 6. 
Cryllal. fubnitriform. Amatn acad. l. p. 479. t, 16. f. 17. 
Spat, cryft. tetradccaed. Wall. fyst. i, 143. ». 6, k. 
4. Pyramidal, with the faces convex. 
5. With a very Ihort prifni. 
Born, ind.fofs. 1. p. 5. tab. I. fig. 2 . 
6. With the cryftals aggregate in a globular form. 
Tophus fpatolus, Syst. nut xii. 3 p. igi. n. 19. 
Spatum orbiculatum. Muf.TeJJ. \\.n. 1. 
Found in the mines of Derbyfinre, Germany, Saxony, Hungary, 
&c. generally pellucid, rarely yellowilh or greenilh, moft 
comptonly white, with the pyramids fometimes deprell'ed ; 
the cryftals foraetinies thincr, fometimes thicker, frequently 
in pairs cutting each other at right angles, or cluftered in 
regular feries, or in fafciclcs or bundles, or in a globular 
olive or pyramidal form, 
°^'>deca- With 6-fided prifin.y, terminaieij at each end by a 6-fided 
pyramid. 
z. With 6-fided prifnis, terminated above with a 6-lided pyramid; 
trie margins of the pyramid incurved towards the prilm, 
Freber 3 Brirfe. p. 50. 
3. With 6-fided prifms, terminated by a 6-fided pyramid, in- 
verfely oppofitc to itfelf in the middle part. 
Freber 3 Briefe, p. 59. 
Found in the mines of Derbyfisire and Cumberland, and in Her- 
cynia, white or yellowilh ; the terminal pyramid fometime? 
augmented by another 5-lided pyramid. 
^hodan. With a double 6-fided pyramid. 
Dog’s tooth fpar. Sonxerby Brit, min, tab. 33, 34, 35. 
Natrum lapidofum. Syst. nat, xh, 3. p. 92, », 13, 
La 
