M i N E II A L O G Y. 



519 



THIRD SUBSPECIES. 

 LEPIDOLITE, Jameson. Lepidolith, Werner. 



Y.iternal Character!. Colour peach- blossom-red, in- 

 dining sometimes to rose-red, sometimes to lilac-blue ; 

 passes into pearl-grey, yellowish-grey, and greeni.-h- 

 grey. Occurs massive, and in small granular distinct 

 concretions. Internally its lustre is gliitening, passing 

 into shining, and pearly. Fracture coarse splintery. 

 Fragments indeterminate angular and blunt-edged. 

 Feebly translucent. Soft. Rather sectile. Rather easily 

 frangible. Specific gravity, 2.816', Klaproih. 2.58, 

 Kan ten. 



Chtmicil Character!. Before the blowpipe it intu- 

 roesces, and melts very easily into a milk-white nearly 

 translucent globule. 



Cwutituciit Partt. S : lica, . 5100 



Alumina, . 20.00 

 Potash, . 18.00 



Fluate of Lime, 4.00 

 Manganese, 3.00 



Iron, . 1 OO100 



Fanquelin, Jour, de Min t. iT. p. 235. 

 Geognottic and Geographic Si'ua/ions It occurs dis- 

 ennnate 1, in foliated and granular limestone, at DaU 

 mally, and in other quarters of the Highlands. 



FOURTH SUBSPECIES. 

 CHLORITE, Jametoit. Chlorit, Werner. 

 This subupeciet is divided into four kinds, v'u. Ear- 



thy Chlorite. Common Chlorite, Slaty Chlorite, 

 Foliated Chlorite. 



and 



First Kind. 



Kirthf F. \RTHV CHLOHITE, Jameton. Erdiger Chlorit, 



Cfclorite. Kn.-strn. 



,-rnnl C/iaraclert. Colour grern. Occurs mas- 

 sive, disseminated, in crusts, and nios-like, inclosed 

 in adularii and rock-crystal Glimmering or glisten- 

 ing ; lustre pearl}. Consists of fine -c.i'v particle*, 

 which are more or le.-.i cohering, and teel rather 

 greasy. Does not foil. Streak is of a mountain-green- 

 colniir. 



Chimiciil Chaiactrrt. It melts before the blowpipe 

 into a blackish slag. 



CoHttituenl Parlt Si! . 2600 



Alumina, IS 50 



M.n." 8.00 



Muriate of Soda, 



or I'ota-li, 2 00 



Oxide of Iron, 43,00 



Lm, . 2.5099.00 



J'nuqnelin, Journ. dps Mines, N. 89, p. 167. 



(jfOfiostic mill (irrgrup'ic St'n/i/i< i It occurs in 



reins along with common chlorite at Forneth Cottage 

 in Perthshire. 



'"(I KlIlJ. 



Common COMMON CHLORITE, J .meson. Gemeiner Chlorit, 

 Chloriir. Werner. 



' (.'/niraclert. Colour is intermediate between 

 dark hi t-kiili-green ai.d li-tk grten Occur - massive 

 and di.-teminated. Lus.rt- glimmering, or glistening ; 

 pearlv, inclining to itinnu. Fracture fine earUiy ; 

 -c.ily foliate!. Fragments bluet-edged. Opa.jue. 

 Becomes light mountain.grctn in the streak, witii a 

 feeble lust i u. Soft. ScciiY. Does, not adhere to th* 

 tongue. Feel* somewhat greasy. 



Gcognofiic and Geographic Situations. Occurs not Oryctogno- 

 only disseminated through rocks of different kinds, as ._'^' x _, 

 granite and mica-slate, but also in beds and veins. It 

 is met with in Arran, Bute, &c. 



Third Kind. 



SLATY CHLORITE or CHLORITK-SLATE, Jameson. Slaty 

 Chlorit-Schieter, Werner, Schiefriger Chlorit, Kartten. Ata* 



External Characters. Colour intermediate between 

 dark mountain and leek-green ; sometimes passes 

 into blackish-green and greenish- black. Occurs mas- 

 sive, and in whole beds. Lustre glistening, some- 

 times inclining to shining, and intermediate between 

 pearly and resinous. Fracture more or less perfect 

 slaty, seldom straight, generally waved slaty, and some- 

 times scaly foliated. Fragments tabular. Opaque. 

 Affords a pale mountain green streak. Sectile ; rather 

 easily frangible. Does not adhere to the tongue. 

 Feels slightly greasy. 



Gmsitnstic Situa'li n. Occurs principally in beds, 

 Hilw.niiM.itf to clay-slate, and is occasionally associated 

 with potstone and talc-slate. 



Geographic tfilii.Tli'i'i. Occurs in beds, in the clay- 

 slate districts of the Grampians, and other parts of Scot- 

 laud. 



Fourth Kind. 



FOLIATED CHLORITE, Jameson. Bluttriger Chlorit, Foliated 

 Werner. chlorite. 



Eternal Cliaraclert. Colour dark blackish-green, 

 which in some rare varieties is dark olive-green. Oc- 

 curs massive, di*nimatrd. in granular concretions, 

 and crygtallixed in tmir--ided pri : ms, and in six-sided 

 tables. '1 he.-e tables are aggregated together, in such a 

 manner as to form the two following figures: 



A. Cylinder terminated by two com -. 



B. Two truncated cone, joined base to base. 



-tuts em rally longitudinally streaked, and are 

 small or iii idd U-- sized. Externally glistening, ap- 

 proac' 1 iny to -li.iii. a, and reMiious ; internally .shining, 

 and pearly. Frn^imm iiuu u miniate angular ; tabular. 

 ()|i.'(|iie; translucent on the edges ; rectiie ; rather dif- 

 fifuhlv frai'^iblc. Ftvls ratlier greasy. Colour light- 

 er in ih t>treak. 



G'>of/*c and Geographic Situations It orcurt 

 in the Island of Jura, one of the He-brides, in quartz 

 rock. 



FIFTH SUBSPECIES. 

 GREEN EARTH, Jameson Griinerde, Werner. 



External Characters Colour green. Occurs massive, 

 seldomer disseminated, more frequently in globular and 

 nmygdaloidal-shaptd pieces, which are sometimes hol- 

 low, in crusts lining the vesicular cavities in amygdaloid, 

 or on the surface of agate balls. Internally dull. Frac- 

 ture earthy, sometimes small Drained uneven. Opaque. 

 Feebly glistening in the streak, but without any change 

 of colour. Feels rather greasy. Adheres slightly to 

 the tongue. 



Chemical Cliaractrrt Before the blowpipe it i 

 converted into a black vesicular slag. 



From the VeroncN. 



Constituent Parti Silica, - 53.0 



Oxide of Iron, 28.0 



Magnesia, . 2.0 



Potash, . 10.0 



Water, . 6.0-%.99.0 



Klaproth, Beit. B. iv. a. 241. 

 6 



Gree* 

 earth. 



