84 EARTHS. CALCAREOUS. 12. Spatum. 



Cryftallus fubnitriform. Amczn aca^, i, p^ j\.So. 22, 

 Nitrum irregulare, Muf. Tefu 26. ». i. tab. 2%/'. 7« 

 Spathum cryftallizatum. Wall, fyst^ i./. 141. «. 6. c 

 Cryftaili fpatofi. Cronst. min. feSl^ 11. 1. b. I. 

 GmeLfyst. nat. 3. ^.447' tab. I./ 3», 



2. With the pyramids hollow and empty. 



3. Each pyramid augmented by another 3 -Tided pyramid. 



4. With the margins of the pyramids obtafe. 

 c. With one of the pyramids longer. 



Cryllallus nitriformis. Jmczn. acad. i. /• 477. /. i6.yi9, 10. 



6, With the cryftals cluftered in bundles. 



Found in the mines of Derb)Jhirc and Cumberland^ in SnvedeTi, 

 Huugary and Germany : more frequently white than yellowifh 

 or with a tinge of green : fomctimes pellucid, fomet mes 

 opake : the cryftals frequently very finall, rarely tranfverlely 

 grooved, and often placed in a regular (cries, 



^exanguh' With a fingle 6-rided pyramid. 

 '*!?• Spat, cryftal. hexang. IVall f^st, min. i, ^. 141. «. 6. b. 



2, The pyramid augmented at the top with an additional 3-fided 



pyramid, 



3. With the cryftals furrounding other bodies in the form of 



prickles. 

 Waller fyst, mint I . /. 142. ». 6, d. 



Found in the mines of 5'af^</(?«, Hercynia^ Germany., Saxony ^ and 

 Hungary : the cryftals larger or (mailer, broader or narrower, 

 fometimes capillary, rarely inverted, often cutting each other 

 at right angles, or cluftered together in the form of fafcicle?, 

 ftars, bundles, iheafsofcorn, ihrubs or double 6-fided py- 

 ramids. 



fentaedrum. With a fimple c-fided pyramid. 



bpat. calcar. cryftal. Botn. ir.d fojf, i. /.6. 

 Found in Hercyma, white, tranfpiirent, aggregate, 



^entagonum With a double 5- Tided pyramid. 



Born, ind.fo/s I. />. 6, 7. 



Found in Hungary^ in the country of the Tyrolefe, fometimes 

 opake, fometimes pellucid, generally white, rarely with a 

 rofaceous tinge ; the cryftals are fpmetimes empty, with the 

 faces unequal, 



pramidak* With a double 3-rided pyramid. 

 ■ Born ind.fo/s. !• />• 5> 6. 2. ^.78. 



2. With the angles of the common bafe truncate. 

 Karsten Lejke mineral, \, p. 2^9, 



^. With the cryftals empty. 

 J^antmhejh mineral, \, p, 2^2^ 



