90 Scientific Intelligence. 



"rock milk" ; the occurrence examined was from the Diessener 

 valley near Horb on the Neckar. A similar form, also earthy and 

 made up of microscopic needles, from the Adams valley near 

 Briinn has been studied by O. Miigge. The conclusion reached by 

 him is that there is no reason for assuming the existence of a 

 new modification of CaC0 3 ; the peculiar characters being prob- 

 ably due to pseudomorphism after organic remains. — Lang, N. 

 Jahrb. Min., Beil. Bd., xxxviii, 121, 1914 ; Miigge, Centralbl. 

 Min., 673, 1914 ; Lang, ibid, '298, 1915. 



Hewettite, Metahewettite and Pascoite are hydrous cal- 

 cium vanadates described by Hillebrand, Merwin and Wright. 

 Hewettite was obtained by D. F. Hewitt, at the vanadium locality 

 of Minasragra, Peru. It occurs in deep red lumpy aggregates of 

 microscopic crystal needles ; it is derived from the oxidization of 

 the sulphide patronite. Specific gravity 2 - 55; melts easily to a 

 dark red liquid; slightly soluble in water. 



A similar red ore of vanadium, Metahewettite, has been found 

 in the Paradox valley, Montrose Co., Colo., and elsewhere over a 

 wide area extending into Utah. For these two minerals the same 

 composition, Ca0.3V s 5 .9H 5 is obtained, assuming the maximum 

 content of water at room temperatures; but both are found to be 

 very sensitive to atmospheric changes of humidity. The course 

 of progressive dehydration over sulphuric acid has been minutely 

 studied and the marked difference in this regard is the reason for 

 the difference in name given. 



Pascoite, also from Minasragra, occurs in clusters of crystal- 

 line (monoclinic ?) grains of a dark orange color. Hardness 2*5 ; 

 specific gravity 2 - 457. It melts to a deep red liquid and dissolves 

 easily in water. Analysis gave: 



V a 6 Mo0 3 CaO H 2 100 - H 2 + tmdet. 



64-6 103 12-6 13-8 7-8 [0-9] = 100. 



The calculated formula is 2Ca0.3V 2 B .ll(?)H 2 0. — Proc. Am. 

 Phil. Soc., liii, 31, 1914. 



Pintadoite and Uvanite are new vanadium minerals from 

 Utah described by Hess and Schaller. Pintadoite forms a thin 

 green efflorescence on the sandstone cliffs of the Canyon Pintado, 

 San Juan Co. An analysis (Schaller) gave : 



V 2 O s CaO H 2 



42-4 22-6 35-0 - 100. 



The calculated formula is 2CaO.V 2 6 .9H 2 0. 



Uvanite is similar to carnotite in appearance and occurrence, 

 but has a brownish yellow color; it has been found only at Temple 

 Rock, Emery Co. An analysis (Schaller) gave : 



V*0 5 P 2 5 As 2 5 U0 3 CaO MgO K 2 H 2 insol. 



37-70 0-06 0-05 39-60 1-73 0-04 0'30 18-28 1-24=99-00. 



After the deduction of impurities, the formula 2U0 3 .3V 2 6 .15H a O 

 is calculated. — Jour. Washington Acad. Sci., iv, 576, 1914. 



