74 Scientific Intelligence. 



analysis showed it to be a hydrous chromium sulphate containing 

 some aluminum and iron. 



Upon the redingtonite occurs another chromium sulphate con- 

 taining less water; it appears in rhombic tables of 78° and 102° 

 with cleavage parallel to the base, macropinacoid and prism. 

 Isomorphism is suggested with copiapite (which, however, is 

 monoclinic according to Linck). It is noted that redingtonite is 

 changed by heating into this second chromium sulphate. These 

 minerals, with also napalite, are described by Becker in Mono- 

 graph XIII, (U. S G. S.) on the quicksilver deposits of the Pacific 

 slope (see p. 68, of this number.) 



Napalite. A mineral resin occurring with pyrite and millerite 

 in vesicular quartz in the Phoenix mine, Mayacmas district, Napa 

 Co., California. It has a consistency like that of shoemaker's 

 wax ; the color is dark reddish brown and it shows a green fluo- 

 rescence by reflected light, which, however, disappears upon ex- 

 posure to the air. The hardness is 2, the specific gravity 1*02. 

 It is brittle, inelastic, with a conchoidal fracture; by the warmth 

 of the hand it can be so softened as to be moulded and drawn 

 into long threads. It becomes liquid at 46° and boils at 300° ; 

 at 130° a heavy colorless oil distils over, while a heavy dark red 

 oil is later obtained having a boiling point about 350°. Analysis 

 showed the composition to correspond to C 3 H 4 . 



Mes$elite. A hydrous phosphate of calcium and iron found 

 in a bituminous clay-slate near Messel in Hesse. It occurs in 

 small tabular crystals, often grouped in star-shaped forms. 

 They are colorless or pale brown, with hardness 3 to 3.5. From 

 the optical characters they are referred to the triclinic system. 

 An analysis gave 



P 2 3 FeO CaO MgO MnO H 2 msol. 

 37-72 1563 3111 1*45 tr. 12 15 l'40=99-46 



This leads to the formula (Ca, Fe) 3 P 2 8 -f-2^H 2 0, which brings it 

 near fairfieldite. Described by W. Muthmann in Zeitschr. Kryst., 

 xvii, 93, 1889. 



Raphisiderite. A name given by A. Scacchi to minute 

 acicular crystals of iron sesquioxide from Pianura and Fiano, 

 which have been examined by E. Scacchi and found to have a 

 rhombic section with an angle of about 72^°. It is not certain 

 that they are not hematite. — Att. Accad. Napoli f "Dec. 1, 1888. 



Cohenite. A name given by Weinschenk to crystals occurring 

 in the Magura, Arva, meteorite. They are indistinct in form but 

 are probably to be referred to the isometric system; they are 

 very brittle, have a tin-white color, hardness 5*5 to 6, and specific 

 gravity 6*977. An analysis gave 



Fe 39-78 Ni(Co) 3 57 C 6'65=100. 



This leads to the formula (Fe, Ni, Co) 3 C. — Aim. Mits. Wien, iv, 

 93, 1889. 



Warrenite. Mr. L. G. Eakins has informed the editors that he 

 has given the name Warrenite, after Mr. E. R. Warren of Crested 



