APPENDIX. 



9 



518 A. KoV.ophan. This name has been given by Sandberger to a gyninite-like looking 

 substance found -with Sombrero guano. It is a tri-basic phosphate of lime with one atom of 

 water, mixed with about 8 per cent, of carbonate of lime. G. =2 70. H.=5. J. pr. 

 Chem., n. ii. 129. 



644 A. Laxuaxsite. A. E. JVordeiiskicM, Pogg. Ann., cxxxvii. 299, 1869. 



3Ionoclinic. C.=69" 46'. a: b : c=\ "3854: 0*7400 : 1. Occurs in wedge-shaped forms 

 with sharp edges. H.=3. G. =577. Color dark olive-green to pistachio-green and green- 

 ish-gray. Streak pistachio-green. Fracture, crystalline to compact and earthy. Composi- 

 tion (| Cu + ^H) 5 P+3 (Pb, On) 2 Cr=Pb 61 -48, Cu 1343, Cr 16-57, P" 7 "83, H 0-99=100. 

 Analyses 1. 2. XordensMold (1. c.) : 





Cr 



P" 



Pb 



Cu 



Pe 



fi 



1. 



15 26 



8-05 



61 26 



12-43 



1-09 



1-31=99-40 



2. 



1676 



8-57 



61-06 



10-85 



1-28 



0-90=99-42 



Cr 



P 



Pb 



Cu 



Fe 



14 



1013 



9-94 



68-33 



7-36 



2-80 



1-16=99.72 



Hermann has reviewed these results (J. pr. Chem., II. i. 447), and called attention to the close 

 correspondence of this species in physical characters with vauquelinite, and also to the fact 

 that the analyses were made on material from the very specimens from which Berzelius ob- 

 tained the vauquelinite. By assuming that what Berzelius weighed as chromic acid was 

 really phosphate of chromium, the residts of the analysis are made to approximate very closely 

 to those of XordensMold ; and Hermann believes that laxmannite is probably identical with 

 vauquelinite. But XordensMold shows in his investigation that there is associated with lax- 

 mannite a chromate free from phosphoric acid corresponding to the vauquelinite of Berze- 

 lius. 



Hermann has also analyzed a phospho-chromate from Beresof, to which he gives the 

 name phosphochramite, a mineral resembling laxmannite in physical characters, but con- 

 taining 



G.=5-80 



This mineral occurs in rounded masses of half a pound weight, made up of globular par- 

 ticles, which exteriorly are covered with small tabular crystals with rounded terminations. 

 It would seem possible that this aggregate might be a mixture rather than a distinct species ; 

 and this may perhaps also be true in regard to laxmannite. A chromo-phosphate of lead and 

 copper from the same locality was described by John (this Min., p. 631) as early as 1845, 

 but was thought to be an impure vauquelinite. 



554. Ume-WaveUite. Kalkwavellit, Ebsmann, Z. G. Ges., xxi. 795 (1869). 



This name has been given to a mineral occurrring in concentric radiated spherical and 

 hemispherical aggregations, sometimes in acicular crystals, as binding material in phos- 

 phorite-breccia; also found botryoidal and reniform. G. =245. Lustre feeble. Color 

 white. Analysis, Kosmann (L c.) : 



P Al Fe Ca Mg Xa K II Si C CaFl 



24-10 30-26 0-29 1646 042 358 0"89 17'90 359 278 0-37=100-04 



Considering the carbonic acid to exist as carbonate' of lime, and assuming the silica com- 

 bined with the alkalies, Kosmann takes the remainder of the constituents Ca 12' 62, Al 3()'26, 

 P 24-11, and H 17-90=84-88, and averages them up to 100 pts. as follows, Ca 14-86, Al 35-65, 

 P 28 '39. H 21 09 =99 99. from which composition he concludes that the mineral is a lime- 

 Ute. In the closed tube yields water. B. B. fuses on the edges. Decomposed by mu- 

 riatic acid with separation of gelatinous silica. 



Found with phosphorite at Dehrn and Ahlbach. Xeeds further examination to determine 

 its exact chemical composition. 



213 D. LrrinoPHORiTE (Brrdtlto/apt). A. Frenzd, J. pr. Chem., II. ii. 203 and iv. 353. 



This is the substance already noticed by v. Kobell (Ber. Ak. Munchen, Jan. 8, 1870, p. 49) 



as a Jithia manganese ore in an examination of a so-called Asbolan from Saalf eld. Occurs in fine 



also compact, botryoidal, H. =3. G. =3 -65 (V. Kobell) 3-14— 3.36 (Frenzel). Lustre 



dull to metallic. Color bluish-black. Streak blackish-gray. Composition : 1. 2. C. Winckler, 



J. pr. Chem., II. iv. 333. t $ / z. . 



