130 Seventh Supplement to Dana’s Mineralogy. 
se fa ellie . homoge 
ous substance. The low amount of ¢ copper obtained by Prof. ‘Shepard is explained 
i i i very considerable 
na 
Sach if Reape pote in my pe vah to aig Shepar ard I gave these with the remark, 
ure of chlorite pad aioe: Prof. enc gives no physical 
= Or okat Freee er hi h distinguish the mineral from chlori 
Cu. Herriv: Surla Nomenclature et la jase itn des eaux Minérales. 8v0. 
Paris, 1859. 
J. Hovist: Des principales eaux minerales de l'Europe. 8yvo. Paris, 1858. 
On the Microscopical Structure of Crystals, by H. ©. Sorby, Quart. Journ, Geol. 
Soc., xiv, 453.—Treats mainly of the cavities in crystals, and draws from Ber 
goto ith regard to the origin of the rocks in which the crystals 
of pseudomorphic minerals occurring in Scotland, by Dr. Heddle ae 
Meg. ie = 42. 
On Pseudomorphism the P hard ae of Calcite and Epidote into Garnet, 
we A. Knop of fiseses: potters Mine 1858, 3 
On Heteromerism gn ghae romertate minerals, by R. Hermann, J. f. pr. Chem, 
Ixxiv, 256—314, lxxv, 3 
Alteration of Minerals—Dr. H. Eichhorn has published (Pogg., ev, 126) an im- 
portant aed on this subject. Pulverized chabasite was exposed to different weak 
oes _) 4-0 grams of chabazite in water peesttead 40 grams of common salt 
400 cubic centimetres, for 10 days in the cold; (2) 15°0 grams, with 100 grams 
= chlorid of ammonium "and 500 ¢. ¢ of water for 21 days; (3) 150 grams, with 
grams with 10-0 grams of carbonat ammonia c. c. water for a1 
‘The following are analyses 0 of true ah oo and thx: altered products 
Ca go Reo BE 
Chabazite, 4744 20°69 oe 065 042 20:18= 99-75 
Altered 1, 4831 2104 665 064 540 1833=10037 
" 2, 51°26 22°17 415 [06] ~ AmO 694=100 
< « . $8, 4839 2076 5-64 6 86 ‘46=100'11 
- = 4, 5061 2126 563 [087] ‘eas AmO 5-91==100. 
Descriptions of Species, 
cuLitr.—This ore from Beresowsk, has afforded R. Hermann (J. f. pr. Ch. 
ray 450): 
81650 Bi3487 ~ Pb3631 Cu 10°97 ah 036 Au 0-09 = 99:00 
ose to the formula (€u, a + 3BiS 
rb, Min. 
1868, 313). r te or tanta late of | re and manganese with 9-7 per cent, of 
Crystallis tion dimetric, the mee undetermined. H.=35—45. @.=3%- 
ioe 7 aa rea 1 pepe to brown and blac ne ck, | Streak 
or owish white. From ame Finland, wi 
small crystals of tantalite. tine 2 
agi 
—— 
eee oe pin o,f 
ee 
