I04 



EARTHS. CALCAREOUS. 25. Gypfum. 



Idmelii 



are^ 



spectilare. 



glaciah. 



^shnitcs. 



fi 



ney-colour : breaks into fine ard cOarfe- grained concretions-, 

 Ibmetimes cohering fo loofely as to be eafily triturated be- 

 tween the fingers. 



Shining, breaking into indeterminate pieces, of a common 

 forni, laipcliar with the foliations incurved. 

 Gypfum lamellare. Wall. fytt. min. \.f\ 158. n.i^. 

 Lameliated Gypfum. Schmer^er mineral. 1. p, 241. 

 Foliated Gypfumv Thomfcni Chem, 3. p. 616. 

 Found in Thurin^iuy VVirtemhurg^ and ^pain ; diaphanous Or 

 opake, fmoke-colour, white, or yellowifh. 



Pellucid, white> fhining, of a common form, breaking 

 into rhomboidal fpecular fragments, lamellar with 

 ftraight foliations. 



Gypfum l;^m^ll. pellucid. Wall. (yst. l. p, 159. n. 5. 



Broad foliated Gypfum. Kir<zv an mineral. I. p, 123. 



Found amorpkous or cryftallized, in various mountains of 

 Europe^ generally in the vicinity of fait lakes and pits: th6 

 thinner foliations are a little fonorous and very fine : the 

 cryRals are in 6-fided prifms terminating in an edge, or 

 rhomboidal, wedge-form, tabular or lenticular^ the planes 

 of thecryllah which form the acute angles are Ilreaked longi- 

 tudinally, thofe that form the obtufe arc fmooth. 



Pellucid, white, fhining, of a common form, breaking 

 into wedge-form fragments, lamellar with ftraight 

 parallel foiialions. 

 Nitrum lapidofjm. Syji. nat, xii, 3. />. 90. n, 8. 

 Gypfum cryilallizatum. Cronji. miner. feSi^ 19 ». l. A, 

 Found with the kft fpecies, of which it may probably be only 

 a variety. 



Pellucid, fhihing, rhombic, lamellar with ftraight parallel 

 foliations, breaking into rhomboidal fragments. 

 Selenitts. Syst. nat. \,p, 162. n. \, tab* 18,/; 3. 

 Narrum lapidofum. Syit, nat. xii. 3, />. 91. «. 9. 

 Cryltallus gjpfea. Jlmasn, acad. 1.^.475. /, \i. f» 3« 

 Selenites, Muf. AugL tab. z\» f. 5, 6, 

 Sclenites. Rumph. 'muf, tab.^z. f. l^ 12. > 



Gvpf. cryftall. Wall. min. p. 46, «. r. tab. \*f, 3» 

 Wall. Jy ft. min. i ./>. i6^. «. 9. a. tab. i, f, 1 4. 

 GmeL fyst nat. 3. p. 446. tab. I. jig. 17. 

 So'werhy Brit, miner, i* p. 141. tab. 67, 68. 

 Gypfum. Sclenite. Kirnxan mi*ier.i. p.w^. 

 Selenitic Spar, ^chmeijjer mineraU l,p. 243. 

 5ulph.1t of lime. Ihomfonchem. 3./». 614. 

 Found with the two former fpecies, with the cryllals generally 



in 6-fided prifms, terminated by 2-fided or 4-lided fummits ; 



it commonly caufes double refradion ; colour white or grey. 



