Third Supplement to Danas Mineralogy. 259 



Platinum [p. 12, and Suppl. i, n]. — Composition of the platinum of Borneo, by- 

 Max Booking of Bonn (Ann. Ch. u. Pharm., xcvi, 243): — Platinum 82-60, iridium 

 0-66, osmium 0-30, gold 0-20, iron 10-67, copper 013, iridosmine 3 80=98 36. It 

 occurs with grains of iridosmine, gold, chromic iron, magnetite. Among the plati- 

 num grains, there are some octahedrons of very regular form and also the cube. 



PYROMELANE, C. IT. Shepard, Am. J. Sci., [2], xxii, 96 — Found in grains or 

 kernels among the sands at the gold washings of McDonald Co., N. C. ; the grains 

 irregular and pitted, looking somewhat like those of chondrodite. H =6 5 ; G. = 

 3'87 ; color reddish-brown to nearly black ; translucent ; lustre resinous to resino- 

 vitreous. 



Composition undetermined, no analyses being given. Said to be " essentially a 

 titanate of alumina and iron, with only traces of glucina? and lime. It may also 

 contain zirconia." 



Pyrosclerite [p 291.] — The steatite-like mineral from Snarum occurring with 

 the Volknerite, partly resembling a talc and partly a mica, which has been analysed 

 by Hochstetter and Giratowski, is the subject of a note by Rammelsbeig (Pogg. 

 xcvii, 300), who has analysed a specimen named mica from the same place. The 

 analyses give — 





Si 



XI 



£e 



Mg 



n 



1. 



3203 



1252 



4-48 



37-52 



16-19 



2. 



30-U2 



13-2 



3 1 



37-9 



17 0 



3. 



34 88 



12-48 



5-81 



34-02 



13-68 



102-74, 

 1014, 



Hochstetter. 

 Giratowski. 

 Rammelsberg. 



for R. fi, Si, TP, 

 Si+Ad Si+6H, 

 [The Voigtite, 



The last (and the others nearly correspond) give the oxygen ratio 

 13 37 : 7 57 : 18 12 : 12 16 = 2 : 1 : 3 : 2, and afford the formula 2Mg r - 

 the formula deduced by Hart well for the Kyemmererite of Bissersk. 

 beyond, appears to be related to this compound.] 



Quartz ("p. 145, and Suppl. n.] — Capillary crystals, some an inch long, occur not 

 far from Walchow, Moravia. — Glocker, Jabrb k. k. geol. Reichs., 1855, 100. 



A singular compound structure in a crystal of quartz is described and figured by 

 Kenngott (Pogg. xcvii, 628). A single hexagonal prism terminates in 6 prisms 

 which coalesce across the centre so as to make a regular star of six rays. 



Quicksilver fp. 14.J — Near Cividale, not far from Gagliano, in Venetian Lom- 

 bardy, native quicksilver has been found in marl, connected with the " macigno," 

 regarded as a part of the eocene nummulitic formation. Quicksilver in drift de- 

 posits has been found at Sulbeck near Luneburg, at Illye west of Deva in Transyl- 

 vania, and at Montpelier. Near Eszbetek in Transylvania, and near Neunwkt in Ga- 

 licia, springs issue from the Carpathian Sandstone, which are said sometimes to bear 

 along globules of mercury, especially after thunder storms. — Jahrb. k. k. Geol. 

 Reichsanst., Nov. 1855, in Quart. J. Geol. Soc. xii, Misc. 8. 



Rhodonite [p. 167, and Suppl. n, Paisbergite.] — Under the name of Rhodonite, 

 R. P. Greg, Esq., has described some brilliant crystals from the Paisberg iron mine 

 near Phillipstadt in Sweden, which Dauber has referred to Paisbergite. Dauber's 

 measurements are given in Suppl. ii, under Paisbkrgith:. Greg also makes the form 

 triclinic, though near pyroxene. The planes 1 and I' (which are the analogues of 

 the fundamental prism of pyroxene, see Suppl. n) give the angle 87° 20' ; cleavage 

 highly perfect parallel to 7, less so parallel to I' ; also highly perfect parallel to O. 



Angles according to Greg, to which those obtained by Dauber and the correspond- 

 ing angles of pyroxene are added : — 



Greg. 



87° 20' 



93° 50' 

 110° 40' 

 136° 20' 

 138° 20' 

 148° 42' 

 142° 30' 



86° 35' 



Dauber. 



87° 38' 

 93° 28£' 

 111° 84' 

 136° 8£' 

 138° 

 148° 47' 

 142° 39^' 

 85° 24' 



In Pyroxene. 



87° 5' 

 100° 57' 

 100° 57' 

 133° 32£' 

 136° 27i' 

 144° 35' 

 144° 35' 



A 



-1' 







ii 



I 



) 



