MINBEALOOT. ^fj 



cinnabar. A complete scries of specimens shows that the form and 

 structure of antimony glance is kept throughout. The first change 

 seems to be into stiblite (antimony oxide), and progressively through 

 a mixture of the latter with metacinnabarite (amorphous cinnabar) 

 into nearly pure cinnabar. The change may have been effected by the 

 solvent action of calcium sulphide upon sulphide of mercurj' from its 

 solubility in the analogous sulphide of barium. The association of 

 gyjisum with the mineral is adduced in support of this view. H. B. 



Sandberger, Prof. F. Ueber den Clarit. [Clarite.] N. Jahrh. 

 Heft iv. pp. 382-388. 



The new mineral Clarite, from the Clara Mine, near Schapbach, in 

 the Black Forest of Baden [see Geological Record for 1874, 

 p. 248], contains copper, 46*29; sulphur, 32-92; arsenic, 17*74; 

 antimony, 1*09 ; iron, 0*83 ; zinc, trace ; = 98^87. Its composition is 

 therefore similar to that of some varieties of enargite ; but the com- 

 pound must be dimorphous, for clarite is now found to be monociinic, 

 not rhombic like enargite ; the two species also differ in colour, hard- 

 ness, &c. r. w. R. 



. [Mineralogical Xotes.] N. Jahrh. Heft vi. pp. 624-626. 



Describes a baryta-mica from the emerald -bearing mica-schist of 

 the Habachthal in Salzburg. The mineral crystallizes in the rhombic 

 system, and is optically uniaxial ; colour white ; sp. gr. 2*83. An 

 analysis is given showing that it agrees with the Oellacherite or baryta- 

 mica of Sterzing in Tyrol. It is notable that no soda is present. Also 

 refers to some nodules of brown iron-ore from Mexico, partly pseudo- 

 morjjhous after pyrites, and remarkable for containing platinum. 



F. W. R. 



. [Mineralogical Notes.] N. Jahrh. Heft. viii. pp. 853, 854. 



Refers to the occurrence of "Wapplcrite, Haidingerite, and Nickel- 

 g} mnite. Explains that he did not compare Luzonite with clarite, 

 because the crystallization of the former is unknown. [See Weisbach, 

 p. 263.] F. W. R. 



Scacchi, — . rCrvstallization of Aphthalose.] N. Jahrh. Heft vi. 

 pp. 620-022"; 3 figs. 



Letters maintaining that the Vesuvian Aphthalose (Jrcanite or 

 Glaserite) is rhombohcdral, and not rhombic as Yom Rath has asserted ; 

 the measurements of the latter are reconciled with the rhombohcdral 

 system by admitting Scacchi's polyhedrism. Vom Rath adds a note 

 arguing that, as the figures in these letters reseitible those of the twin- 

 forms of aragonite, they support his view of the orthorhombic character 

 of this species. F. W. R. 



Scharff, Dr. Friedrich. [Indian Quartz.] N. Jahrh. Heft vi. 

 pp. ()2r», 627. 



Com}) ares the occurrence in India with that at Oberstein ; and sug- 

 gests that the British Museum specimen, labelled " Aurungabad," was 

 obtained during the construction of the railway between Bombay and 



1875. ' « 



