MINERALOGY. 285 



cium and magnesium. An opaque, earthy, snow-white min- 

 eral, having a hardness equal to 3 and a specific gravity of 

 2.5. From the West Indies. 



Reddingite. A hydrous phosphate of manganese, related 

 to scorodite in composition, and closely similar in form. It 

 appears in minute orthorhombic octahedrons, of a rose-pink 

 color and a vitreous to sub-resinous lustre. Found rarely 

 with other manganesian phosphates at Branchville, Fairfield 

 County, Conn. ; described by G. J. Brush and E. S. Dana. 



JRhabdophane. A phosphate of didymium, erbium, and 

 other metals. It resembles sphalerite, and has formerly 

 passed for that species, but was recognized by the absorp- 

 tion-bands which it gave in the spectrum. From Cornwall, 

 England ; described by W. G. Lettsom. 



Steelite. A variety of mordenite, described by How as oc- 

 curring in the trap at Cape Split, thirteen miles from Cape 

 Blomidon, Nova Scotia. 



Stibianite. Supposed to be a hydrated oxide of antimony 

 formed from the decomposition of stibnite. It is a massive, 

 somewhat porous mineral, of a reddish-yellow color. From 

 Victoria, Australia ; described by E. Goldsmith. 



Stiltzite. A telluride of silver, isomorphous with dyscra- 

 site and chalcocite. Found in minute, highly modified crys- 

 tals upon a specimen of gold from Transylvania; described 

 by Schrauf. 



Szaboite. A silicate of iron and calcium, related to babing- 

 tonite. It occurs in small thin crystals belonging to the tri- 

 clinic system. The color is hair-brown to hyacinth-red, and 

 it is almost opaque. Found in the Aranyer Mountain, Tran- 

 sylvania; described by A. Koch. 



Taznite. A chloroarsenate and chloroantimonate of bis- 

 muth found at Tazna, Bolivia; described by J. Domeyko. 



Totaigite. A mineral of uncertain character, related to ser- 

 pentine, and probably produced by the alteration of pyroxene. 

 From Totaig, Ross-shire, Scotland ; described M. F. Heddle. 



Triploidite. A hydrous phosphate of manganese and iron, 

 related to triplite. It is found occasionally in distinct crys- 

 tals belonging to the monoclinic system, and similar in form 

 to those of waomerite : more o-enerallv it has a fibrous to co- 

 lumnar structure. The color is yellowish to reddish brown, 

 occasionally hyacinth-red ; it is transparent, and has a vitre- 



