O APPENDIX. 



In the closed tube both varieties give off neutral water. B. B. the fresh mineral glows 

 and fuses. Soluble in muriatic acid. 



Found with homstone and brown-spar on specimens from Joachimsthal, obtained eighty 

 years ago, and now in the Wurzburg Museum. 



■*' 188 A. Jacobsite. A. Damour, C. R., lxix. 168. 



Isometric, in distorted octahedrons, H. =6? (scratches glass). G.=4'75. Lustre brilliant 

 metallic. Color deep black. Streak blackish-brown. Magnetic. 

 Composition : R, fi, or (Mn Mg) (3Fe Mn) 



3Pe Mn Mg 



| 68-25 24-35 6-41=99-01 



As the mineral evolves chlorine feebly when acted upon by muriatic acid, Damour con- 

 siders a portion of the manganese to exist as Mn, giving for the true composition of the 

 mineral, in correspondence to the spinel formula, ¥e 68'25, Sn 4 '21, Mn 20'57, Mg 6'41 = 

 99-44. 



B. B. infusible. It does not lose weight when ignited. With the fluxes reacts for iron 

 and manganese. Soluble in muriatic acid, with a slight evolution of chlorine. 



From Jacobsberg, in Nbrdinark, Sweden, where it occurs associated with white mica and 

 native copper in a crystalline limestone. 



127 A. Julianite. M. Websty, ZS. G. Ges., 1871, p. 486. 



Isometric. Cubic with octahedral and dodecahedral planes. Also dodecahedral. Planes 

 much rounded. 



G. =5' 12. Very soft. Lustre metalhc-adamantine. Color dark, somewhat reddish lead- 

 gray, iron black on exposure. Brittle. Fracture splintery to subconchoidal. 



Analysis by Websky (1. c.) : 



s 



As 



Sb 



Fe 



Ag 



Cu 



26-50 



16-78 



1-42 



079 



0-54 



52-30=98-33 



Giving a composition approaching tennantite or enargite. It agrees with the former in crys- 

 talline form, but differs in density from both these species. 



B. B. Same as tennantite. Found in the Frederick-Julian Mine at Rudelstadt, in Silesia. 



121 A. Klaprotholite. Klaprothit, Petersen and Sandier ger, Jahrb. Min., 1868, 415. 

 Klaprotholite, G. J. Brush. 



This nauie is given to the Kupferwismntherz analyzed by Schneider, and recorded in this 

 Mineralogy under Wittichenite, p. 99, anal. 7. Sandberger gives the following characters : — 

 Orthorhombic, habit in long furrowed prisms. Planes i", i-\ tn-i\ I/\I=107\ Cleavage i-1 

 very distinct. In twins, composition-face 1. Fracture granular. H. =25. G. =4 "6 approx. 

 (Petersen). Lustre metallic. Color steel-gray inclining to yellow, tarnishing brass-yellow. 

 Streak black. Composition, 3 €u S + Bi 2 S 3 =S 19 -22, Bi 55-54, Cu 25-24=100. The mean 

 of three analyses by Petersen gave, on mineral from the Daniel Mine, S 1866, Bi 53*87, Cu 

 23-96, Fe 1 -70 = 98-19. Occurs at many localities in the Black Forest, and distinguished 

 from wittichenite by its distinct cleavage, and in its larger content of bismuth. Klaproth- 

 olite is generally associated with a cobalt-tetrahedrite, while wittichenite is usually found 

 with snialtite. The name klaprothite was given to lazulite by Beudant in 1824, we therefore 

 change Petersen's name to klaprotholite. 



483 A. Kochelite. H. Websl-y, ZS. G. Ges., xx. 250, 1868. 



Tetragonal ? In columnar incrustations passing into rounded, apparently square octahe- 

 drons, occasionally showing prismatic planes. Color brownish isabella-yellow to honey- 

 yellow. Translucent. Lustre dull greasy. H.=3-3'5. G.=3 - 74, taken on 0'1373 grm. 



Composition. An imperfect analysis gave Si 4"49, Si 1"41, 6b 29 "49, Zr 12-81, fh 1-23. 

 Y 17-22, Ca 2-10, £ 0"43, Fe 12-48, H 6 "52, Pb? Na? Loss 11-82=100. 



In the closed tube yields water, and the mineral turns reddish. B. B. in the forceps fuses 

 only on the edges to a black glass, coloring the flame yellow. With salt of phosphorus reacts 

 for iron, but in R. F. fuses to a clear bead, showing only a faint reaction for uranium. With 

 soda on charcoal yields a yellowish-white enamel, but no metallic globules, although giving 

 a lead coating on the coal. Occurs as an incrustation upon a mixture of titanic iron and 

 crystals of fergusonite in a coarse granite in the Kochelwiesen, near Schreiberhau in Silesia. 



The composition is near that of fergusonite, but further investigation is needed. The den- 

 sity is remarkably low for a mineral containing so large a percentage of metallic acids. 



