* APPENDIX. 



346. Cyanochalcite. B. Hermann, J. pr. Chem., cvi. 65. 



Massive. H.=4 - 5. G.=2 - 79. Lustre glistening to dull. Color azure-blue. Fracture 

 even and compact. Brittle. Analysis by E. Hermann : 



Si ^ Cu TT 



26-90 6-95 49-63 16-52. 



According to Hermann, this shows the composition to be equivalent to 1 atom of 

 libethenite, and 9 atoms of chrysocolla. It is evidently a substance of like character with 

 the demidofftte of Nordenskiold. In the tube gives off water and becomes black. With the 

 fluxes reacts for copper. Decomposed by acids without gelatinization. 



Occurs at Nischne-Tagilsk. 



452. Diabantaclironnyn. A name given by Liebe (Jahrb. Min., 1870, 1) to a chlorite-like 

 mineral occurring in the diabase of Voigtland and Frankenwald, and which contributes to 

 the green color of the rock. It is found in seams and clefts, sometimes in amygdules and 

 lining cavities in the rock. In some occurrences of diabase it forms the chief binding or 

 cementing material, and is apparently a product of the alteration of the augitic constituent 

 of the diabase. Compact, breaks with a conchoidal fracture, sometimes fibrous. Lustre dull. 

 Color greenish-black, in thin splinters chrome-green. H. =2. G. =2*81 — 2'93. Composition, 

 analyses by Liebe : 



Fe Fe " Mg H 



26-94 21-22 10-20=99-79 



25-63 21-01 11-27=99-28 



26-60 17 92 15-81=99-25 



3-47 23-52 19-73 11-37=99-37 



21-61 22-44 11-78=9947 



Oxygen ratio for R, S, S*i, H in the last analysis is l3 - 8 : 5*8 : 164 : 10'5. In the closed 

 tube yields water. B. B. turns brown and fuses readily to a grayish-black glass, gives with 

 salt of phosphorus reactions for iron and silica. Soluble in cold muriatic acid with deposi- 

 tion of pure white silica, with nitric acid gives off red nitrous fumes leaving a reddish-brown 

 residue of silica. 



113 A. DiAPnoRiTE. V. v. Zepharovich, Sitzb. Ak. Wien, lxiii. 130. 



In endeavoring to ascertain the cause of the difference of the views of crystallographers 

 in regard to the crystallization of freieslebenite, Zepharovich has discovered that the speci- 

 mens referred to this species belong to two distinct crystalline systems, although chemi- 

 cally they are identical. He retains the name of freieslebenite for the monoclinic form, 

 and names the new orthorhombic mineral diaphorite. The following planes were observed : 

 i-%, i-l, a-3, I, i2-, i-hr, *-3, i-5, i-ll, jj-l, 14, \-i, 14, §4, §4, 24, 3-3, $4, \, £, 1-2 f-3, 

 1-4. Cleavage not observed. Fracture uneven to sub-conchoidal. H. =2*5-3. G. =5'902, 

 (Freieslebenite G. =6 - 35). Lustre metallic. Color steel-gray. Brittle. An analysis of the 

 mineral from Przibram gave Helmh acker (B. and H. Jahrb. xiii. 379) : 







Si 



XI 



1. 



Reinsdorf 



30-27 



11-16 



2. 



Landesfreude 



29-37 



12-00 



3. 



Hollethal 



29-85 



9-07 



4. 



Trilloch 



31-25 



10-03 



5. 



Grafenwart (fibrous) 



31-56 



12-08 



S 



Sb 



Pb 



Ag 



Fe 



Cu 



20-18 



2643 



28-67 



2344 



0-67 



0-73=100-12 



corresponding closely with the earlier analysis by Payr (this Min. Anal. 4. p. 9C». These ana- 

 lyses Zepharovich refers to diaphorite, as no freieslebenite occurs at Przibram. The pyro- 

 gnostic characters of both species are the same. Diaphorite occurs at Przibram and Braunsdorf 

 exclusively, while at Freiberg it is found with freieslebenite. The name diaphorite was 

 formerly used for an altered rhodonite related to allagite. 



503 A. DuPvANGiTE. O. J. Brush, Am. J. Sci., II. xlviii. 179, Sept., 1S69. 



Monoclinic. Form of crystal like that of keilhauite (p. 387), omitting O and — 2i, and 

 adding 4*. Cleavage parallel to I, distinct, giving 110° 10', J. M. Blake. H. =5. G. = 

 3-95-4.03. Lustre vitreous. Color bright orange-red. Streak cream -yellow. Analysis, G. 

 J. Brush (1. c.) : 



As £l 5>e Mn Na Li F— O 

 55-10 20-68 4-78 1"30 11 "66 0'81 (5 -67) =100. 

 53 -22* 20-09 5-06 1"28 11 '86 0-70 



