Supplement to Dana’s Mineralogy. — , 359 
Detvavxire [p. 427]—Analysis by von Hauer (Jahrb. k. k. geol. hag 1854, 
68, and J. f. pr. Ch. Lxiii, — an e percentage after excluding the silica 
6 a 
20°98 5203 194 19°08 = 99-98 
) 19:04 = 99°99 
Von Hauer thence et Mok formula Ca? D4 + Fes B + pic 
Dramonp [p. 24].—A large diamond of pure water, from the Province of Minas 
Geraes, Brazil, has been described by Dufr eS It isa cae with bevelled 
edges, voce weighs zi 4 carats. It is called the “Star of th terre Theré are 
impression of diamond crystals in it, showing that it is aie at a cluster that were 
formed Gdether probably ina géode’ like quartz aie LInstitut, No. 0. 1096, and 
Am. J. Sci. 2], xix, 
Draspors [p. 128) ra locality of diaspore at the Topas vein, Trumbull, Conn., 
mentioned on page 483 of Min., may be added at page 1 
Dotomrre [p. 441 ]—Analysis and description of “4 oe of the Binnen Val- 
by 
ley, in the Alps, containing the Dufrenoysite, é&c., Waltershausen (Pogg., 
xc, 115): Structure sacchar = 1; . rion ‘composition 6 45-966, Ca 29852, 
Mg 20488, insoluble 3:314—=99:220, 0 atly 1 of Ca G to 1 of MgG. Besides 
i 
Dufrenoysite, the dolomite aathing ually phere peieaatl, x0 realgar, arsenomelan, ete. 
Dorrenorstre (p- 77] cranees of Dufrenoysite by W. 8S. y. Waltershausen 
(Pogg., xciy, 120) ; 
As Ag Pb Cu Fe 
27546 = 80-059 1:229 2-749 87746 0°824 = 100153 
affording von Waltershausen the formula, the iron being supposed to be in the 
condition of mixed pyrites, [R? S++ As? S?] -- RS in which R is mainly copper. 
on Waltershausen a that in Damour’s analysis the mineral must have 
mixed with arsenomelan (q. v.). He was careful to analyse the monometric 
a G. =4:477, mean of 8 dete terminations. 
ats 2963, 1 0 26°84, Ca and Na trace, TE 1246=9 
P. 823, is the deduced percentage corresponding to i rmula—Glottalite an Thom 
Mr. dle as imp 
426] Sg ted to coe (Sitzangsber, xii, 26), the Ehlite from 
ay ae the Rhine, is similar in to liroconite, being trimetric; the sum- 
; ait dome, of two planes meeting in 
Evxourz [ ea with an angle of 120° nearly, — : cleavages, 
Meeting at an cats of 60°; anda ao at cide cr ie with th e; optically 
according to Dam ee L. Semann. (Communicated.) 
Evxesrre [p. 358] PR i tion and ‘rile by David Forbes (Edinb. N. tee J. 
121, i, 62), "Mineral tin Aaewt Tromoei oo as i orway. 
ic; per et wo, eS as M-O , 
ih in een ae tie FERC = 126°, o-e 7 i = 154° 307, 
Dahl: ~:0-% 117°, 0: 0 : we 
oxy 4 
in color when cold’; in the reducing flame e unchanged even 08 faning 
pl me a glass greenish-yellow while hot, nearly eolotoss ‘on cool- 
i ‘or manganese although containing both of these metals. 
Ob Ti dl Mg H 
3858 1436 312 127 O19 2936 331 198 522 288 = 10037 
Oxygen 453 579 145 O88 O07 587 O47 O49 geo a 
columbic acid is srited with See Shans SS The oxygen in the columbic aci 
Mtge hic) dedact om weight of tantalum. rati 
= sod taser, excluding the water 1032" 938. 
