APPENDIX. 11 





F 



P 



3tl 



Stn 



Ca 



Na 



Li 



Si 



Ign. 





1. 



26 50 



21-80 



38-20 



— 



2-00 



6-70 



6-50 



2 25 



0-60=104-55. 



M. 



2. 



8-20 



46-15 



36-32 



40 



— 



2-58 



8-10 



— 



1-10=102-85. 



P. 



3. 



9-00 



45-91 



35 50 



— 



50 



5 30 



670 



0-60 



0-70-104-21. 



K. 



Pisanfs and v. Kobell's results give essentially the composition of amblygonite as analyzed 

 by Raniruelsberg, and as the physical and pyrognostic characters are also those of amblygonite, 

 there can be no question as to the identity of the Montebras mineral with this species. 



Mobtzonite. F. v. Kobell, Ber. Ak. Munchen, 6 May, 1871. 



Compact. H. =6. G.=3. Color light grayish-green. Translucent on thin edges. 

 Fracture splintery to sub-conchoidal. Kesernbles green homstone. Analysis by v. Kobell 



^■ c -> : ...,.- • • 



Si A-l Fe Mg Ca Na K H 



52-60 17-10 9-00 210 965 660 1-90 1-50=100-45 



Giving the oxygen of B, S, and Si as 1 : 1 : 3*5. 



B. B. fuses at 3 to a lustrous grayish-green glass. Not decomposed by acids after fusion. 

 Not attacked by muriatic or sulphuric acids. Soluble in concentrated phosphoric acid. 



Found on the Alonzoni Mt. in the valley of Fassa, Tyrol. A microscopic examination of a 

 thin plate of the mineral showed it to be homogeneous. 



y.r,>imlte. C. W. Bhmstrand, CEf. Ak. Stockh., 1868, p. 197. 



A chalk-white mineral, from Xasum, Sweden. It occurs mixed with the phosphate atta- 

 colite. After calculating out the phosphoric acid as Xl P, the analysis gave Si 50'91, 3cl 

 27-86, Fe 1-36, Sin 0-36, Ca 13-82, ft 4-39=98-70. The oxygen ratio of E, fi, Si, ft is asl : 

 3:7:1. It may perhaps be classed near fahlunite. 



510. Xadorite. Flajolot, C. R, bad. 237, 406. F. Pisani, C. K., lxxi. 319; Des CM- 

 zeanx. Ann. d. 11, VI. xx. 32, 1871. 



In flattened tabular orthorhombic crystals, / A 2=132° 51'. Cleavage macrodiagonal, 

 very easy. H.=3. G. =7 "02. Lustre resinous to adamantine. Color smoky-brown to 

 brownish-vellow. Streak yellow. Translucent. Analyses: 1. Pisani (1. a); 2. Flajolot 

 (I.e.): 



Sb Pb O CI 



1. 31-24 51-89 814 9-00=100-27 



2. 32-25 5100 8"00 8-85=100-70 



Pisani considers the mineral to correspond to the formula Sb Pb -f- Pb CI, while Flajolot 

 looks upon it as a compound of oxychlorid of antimony with oxyd of lead. Pisani suggests 

 its analogy with mendipite 2 Pb + Pb CI. 



In the closed tube decrepitates and gives a white sublimate. B. B. on charcoal yields an 

 antimony coating and a globule of metallic lead. Added to a bead of salt of phosphorus 

 saturated with copper gives the blue coloration of the flame due to chlorid of copper. Sol- 

 uble in muriatic acid ; also in nitric acid diluted with tartaric acid. 



From Djebel-Xador, in the province of Constantine, Algiers. 



214 A. Xamaqtjalite. A. H. Church, Jour. Chem. Soc, II., viii. 1 (1870). 

 In silky fibres and thin layers. H. =2 5. G-. =2 - 49. Lustre silky. Color pale-blue. 

 Transparent to translucent. Analysis by Church (1. c.) : 



Al Cu Slg Ca Si ft 



1529 44-74 342 201 225 32-38=100-09 



Giving the oxygen ratio of B, S and 3 as 4 : 3 : 11, or 4 S ft + £l fi 3 + 4 ft. 



In the closed tube gives off water and turns black. B. B. reacts for copper. 



From Xamaqualand, S. Africa. It is analogous in composition to hydrotalcite (p. 178). 



146 A. X.\XT07CiTE. An anhydrous sub-chlorid of copper from Nantoko in Chile. Occurs 

 in a copper vein with atacamite and oxydized ores at the surface, while lower down in the 

 vein this anhydrous chiorid is found with chalcopyrite and chalcocite. The mineral is white, 

 resembles cerussite in physical characters. It oxydizes on exposure to the atmosphere, and 

 i.s converted into atacamite. W. Hermann considers all atacamite the product of the altera- 

 tion of nantokite {JBreittumpt in B. and H. Ztg. xxvii. 3). i $jt. . 



