212 Tenth Supplement to Dana's Mineralogy. 



cleavage and an imperfect prismatic cleavage. The crystals often occur -with 

 morphite. Some specimens of stalactitic sulphid of lead, exami^d by Bieitl 

 were also found to have this peculiar cleavage. Breithaupt considers that th 

 specific gravity of the crystals, 682 to 6 87, is remarkable, but he gives no che 



variety of galena {B. and H. Zeitwng, xxi, 99). 



For Dr. Genth's paper on copper-glance, pseudomorohous of aalena. see co 



Glauberite [p, 374].— Pisani has found a brick-red friable and resinous-like 

 variety of glanbente, associated with polyhalife and anhvdrife, in common eslt, 

 at Varengeville, near Nancy. Composition: S'a § 50 50,CaS 48-78, clay 040= 

 99 68.~( Co>n;)<M Rendus, 15, 731, in Kopp's JahreBbericht, 1860, 788.) 



, IX].-^0. C. Mar 



Cu Fe 



rw..n rV ^7'"^^^:»:'-enfetown had a density of 18-60, indicating a composition De- 

 iween that of the Tangier and the Lunenburg specimens. The Tangier gold « 

 r„^!vli • f "^ purity, being only surpassed in this respect by that from Scbab- 

 rowsk. (this Journal, xxxii. 3^9). ^ ^ 



this ^' •^^"*'' ^^^ '^"""^ ^"^^ pseudomorphous of aikinite. The exact locality of 



originalluineral (this Journal AVxsxHi '%m ^^ owing t e riom 



Lon.lon. in September" I8V9, and'yielded i8!37^6'";S?]Sd!'srerling of Gold!^!^''.^^- 

 ^nn., cxii, €44, But. Ashoc. Report, 29th Meeting, p. 85.) 



Sc?tL^''^ir„Sufs^^imJe7d^d^ir *""' '^^f'"^"'*^^ gyrolite r^t^zr Margaretville.^NoTS 

 ImSl, '"conroS''-^'''^''""'^"'''^^ frora''prn^JLrd%o"nearly hif an"inch io ^■ 

 Si Ca Si il. i fl 



51-90 29 95 1-27 0-08 1-60 1605 = 99-85 

 giving the formula, Ca Si+l|fl, and corresponding nearly with Anderson's analpij 

 of the mineral from the Isle of Skye. How calls attention to the close relation pf 

 this mineral t/i apophyllite, and suggests that the existence of carbonate of hm^ 

 the cavities with the gyrolite, would seem to show that the latter is formed fro» 

 apophylhte by the waters which deposited the carbonate of lime, reacting on '"» 

 Jouraal°r r*'*'''- ''"'' *^^^o^^'°i? «^t at the same time the fluorid of calcium ("»» 



nr^^'nTf^u '^Pj- 251, VII]._F. Pisani has analyzed Shepard's glosmom^^^^ 

 proved It to be identical with halloymte {Camptes Rendus 1 i 3 10)! The specmi-^o 

 *:^ined was received from Des cloizeaux. ^loJtZthe foUowiig characters for 



