252 Scientific Intelligence. 



This gives the formula Be 2 Si0 4 . Mn 2 Si0 4 , or equivalent to 

 phenacite + tephroite, and Brogger (ib., p. 37V) shows that in form 

 also it forms a transition from the rhombohedral phenacite to the 

 orthorhombic tephroite. 



Hintzeite is a new borate from Stassfurt, described by Milch 

 from Stassfurt. It occurs in small monoclinic crystals, colorless 

 or white, imbedded in pinnoite. Hardness = 4-5-5 ; sp. gravity 

 2*127. Analysis by Baurath gave : 



B.,0 3 MgO K 2 Na 2 CI H 2 



52-39 13-80 8-14 0*39 0'35 23-83=98-90. 



For this the formula KMg 2 B 9 16 . 8H 2 is calculated. — Zs. 

 Kryst., xviii, 478. 



Heintzite is described as a new borate by Luedecke. It oc- 

 curs in monoclinic crystals associated, like the above Hintzeite, 

 with pinnoite, and although the descriptions do not entirely 

 agree it can hardly be doubted that they are the same mineral. 

 There is a striking similarity in the angles given. Analysis gave : 



B 2 3 60-53 MgO 12-23 K 2 7-39 H 2 19-85 = 100. 



For this the formula is calculated H 2 KMgB u O 20 . 6H 2 0.— Ibid., 

 p. 481. 



Castanite is a hydrous ferric sulphate described by Darapsky 

 from the Sierra Gorda, S. America. It is found in prismatic 

 crystals of a chestnut-brown color. Hardness = 3; sp. gravity^ 

 2-18. Analysis gave : 



S0 3 33-80 Fe 2 3 33 92 H 2 30*76 barite 1-15 = 99-63. 



The formula is Fe 2 3 . 2S0 3 . 8H 2 0, or like that of amarantite 

 except that it contains one more molecule of water. — Jahrb. Min., 

 ii, 267, 1890. 



Falkenhatnite is a sulphantimonite of copper, from Joachims- 

 thal, allied to wittichenite. It is only known in a single specimen 

 in which it is associated with chalcopyrite and siderite. An 

 analysis after deducting a large amount of a carbonate of iron 

 and magnesium, also quartz, gave : 



Cu Fe Zn 



100. 



Assuming further the existence of chalcopyrite and deducting 

 this, the formula Cn 6 Sb 2 S 6 — 3Cu 2 S . Sb 2 S 3 is obtained. — Jahrb. 

 Geol. Reichs., xl, 433, 1890. 



14. Diamonds in Wisconsin. — The finding of a few diamonds 

 in the gold gravels of Plum creek in Rock Elm township, Pearce 

 county, Wisconsin, is noted by G. F. Kunz. The stones weigh- 

 ing ff, T 7 g- and -^ carat were specially examined. The sand con- 

 tains, besides quartz grains, magnetic and titanic iron, garnets, 

 monazite, etc. The diamonds are stated to have been found in 

 188'7 by G. H. Nichols of Minneapolis. 



15. Native Nickel of terrestrial origin. — A. Sella notes the 

 existence, in the auriferous sands of the stream Elvo near Biella, 



s 



Sb 



As 



Bi 



Cu 



Fe 



Zn 



26-21 



23 10 



4-77 



0-32 



39-51 



4-20 



1-89 



