250 Third Supplement to Dana’s Mineralogy. 
contains selenite in large plates which are eae aps be this earthy carbonate. 
d the change by supposin s holding pees of 
transparent; a L D 
tables have the pees and Seraph: of aragonite. sage gravity 2.984 a 
kin ay. Color 
bite me aa bro to gold-yellow ; lustre submetallic, anak B-sided prisms 
th . The an i 
s ual “wits the micas, near 120°. Laminz but little elastic, Contains Si, Pe, 
, Mg, K, Na, Mn, Oa, and about 8 per cent of water with no fluor. 
Aracautre (2) [p. 138, and Suppl. 1]—Prof. Scacchi questions the occurrence of 
mite at Vesuvius (op. cit, p. 197). The supposed atacamite occurs (1) in 
Opaque crystals, bet een reen and bests bluish pre . 
crust, _ rough surface and emerald-green color; (4) in a very thin crust, © 
fine e en idaren en color. The first variety attic seems to be t 
into the 
ond, 
Prof. Se: noe concludes from his various trials, that the mineral does not contain 
chlorine; that its composition is not constant; that ordinarily on pricey? it in 
water, it affords an insoluble salt of a bluish color, which dissolves in nitric acid 
affords reactions of sulphuric acid and copper, and may be a basic sulphate of ¢ copper: 
Binsrre [Suppl. 11].—This mineral which occurs with pes Asatte bh in the dol- 
omite of Binnen, is described by Ch. Heusser, in Pogy. xevii, 120. Cr stallization, 
trimetric. Occurring forms prismatic, stated hngitadkeally, the prism J, having 
ometimes 
O, 1, %, and a macrodome Basal angle of the dome 4%, 48° 52’; of 6 77° 39’; of 
$%, 100° 38’; of 2%, 16° 12’. Color pale or dark steel-gray to ; streak- 
powder uniforml 3 Seg arker red than that of the dufrenoysite; very par frae- 
ture perfect conchoidal. 
Boracrre [p. 393, and Suppl. a po ar massive boracite of Stassfurt, which wre 
ti true boracite i so ready solubilit i been 
amed Stassfurtite by G. Rose (Pogg xevii, 632). e Solution in heated muriatie 
acil deposits after : , wins, a ted boracic acid. The masses are not properly 
structureless but have a columnar one ition and the system of crystallization 
probably is nut monometric. ‘Chemica alpray: ite and, stassfurtite according to 
analyses, give a same formula; and if so, the two are an example of dim orp. 
H. Rose has n alyses under ip a ‘and other examinations of specimens 
clear up the soabie « on the subject 
Borovateooatcrre [p, 394]. g Prcatang of this mineral from near Iquique, S. 4» 
by Rammelsberg (Pogg. xcvii, 301) : 
Ca Na kK H 
43:70 13 iL 6 67 0-83 35:67 = 100 
$17 p.c. of chlorid of sodium, 0-41 sulphate of soda, and 0°39 of su hate OB 
obtained in the analysis being excluded. = gives the formula a Ne Behe 
ysis 
18H. The pe bro edter 3 in physical characters, which Hayes analy ipaed, 8 Aen 
him the composition Oa B?-+-6H. x 
vant E, D. Forbes and T. Dahll (N yt. Mag. f. Nat. = —In indistinct, probs 
stals, imbedded in orthociase, and found near Helle, Narestd, Alvé 
and ake, orway. Fracture pone H=6—65. @. = 13—5'36. 
