to4 EARTHS. CALCAREOUS. 25. Gyplum. 
ney-co’our : breaks into fine and coarfe-graincd concretions, 
ronietimes cohering Ib loofely as to be ealily triturated be- 
tween the fingers. 
lamellai-e. Shining, breaking into indeterminate pieces, of a common 
form, lamellar with the foliations incurved.- 
Gypfuni lamellare. Wall. (yst. min. l.p. 158.17.4. 
. Lamellatcd Gypfuni. SchmeiJJer mineral- X. p. 
foliated Gyptum. Tljom/on's Chem. 3. p.6i6. 
Found in Thuriayia, VP'irtemburg, and Spain ; diaphanous or 
opake, fmoke-tolour, white, or yellowifh. 
speailare. Pellucid, white, (liining, of a common form, breaking 
into rhomboidal fpecular fragments, lamellar with 
ftraight foliations. 
Gypfum laiiiell. pellucid. Wall. Cyst. i. p. 159. n. 5. 
Broad foliated Gypfuni. Kirvean mineral, i. p, 123, 
Found amorphous or eryltallized, in various mountains of 
Europe, generally in the vicinity of fait lakes and pits: the 
thinner foliations are a little fonorous and very fine : the 
cryftals are in 6-fided prifnis terminating in an edge, or 
rhomboidal, wedge-form, tabular or lenticular; the planes 
of the cryftals which form the acute angles arellreaked longi- 
tudinally, thofe that form the obtufe are fmooth. 
glaciale. Pelliicid, white, Ihining, of a common form, breaking 
into wedge-form fragments, lamellar with ftraight 
parallel foliations. 
Natrum lapidofum. Syfi. nat. xii. 3. /.go. ». 8. 
Gypfum cryftallizatunii Cronji. miner, fed, ig. n.l. A. 
Found with the laft fpecies, of which it may probably be only 
a variety. 
'Selenites, Pellucid, fliining, rhombic, lamellar with ftraight parallel 
foliations, breaking into rhomboidal fragments. 
Selenites. Syst. nat. x . p. 162. n. i. tab. \%.f. 3. 
Natrum lapidofum. Syit. nat. xii. 3. p. 91. «. g. 
Cryftallus gypfea. /Imttn. acai. i./. 475. /. 12./. 3. 
^ Selenites. MuC Angl. tab. 21. /. 5, 6. 
Selenites. Rimph.muf.tabyZ.f.i.iz. 
GvpI. cryftall. Wall. min. p. 46, n. 1. tab, \.f. 3, 
Wall. Jyst. min, i./. 165. «. g. a. tab, i, /. 14. 
(Imel. jyst nat. 3. p. 446. tab. i. fg. 17, 
Sonverby Brit, miner, l. p. 141. tab. 67, 68. 
Gypfum. Selenite. Kir wan miner. \. /. n 8. 
Selenitic Spar. Schmeijfer mineral, l.p. 243. 
Sulphatof lime. Ihom/onchem. 3./. 614. 
Found with the two former fpecic.s, with the cryftals generallv 
in 6-fided prifnis, terminated by z-fided or 4-(ic’ed iummits*: ' 
it commonly caufes cfouble refraffion : colour white or grey. 
