lIiiiiksi'feTa new Anhydrous Sulphato- Carbonate. 241 



here described. In particular I refer to crystals which I have 

 seen credited to Colorado and to Nevada. 



The crystals here analysed were found with salt, Thenardite, 

 tincal, etc., at the works of the San Bernardino Borax Co., in 

 San Bernardino County, California. 



The density of this new California mineral is 2.562. Its 

 hardness, 3.-3.5. It is readily soluble in water. Effervesces 

 with acids. It affords, when dissolved in water, an abundant 

 precipitate of barium sulphate when barium chloride is added to 

 the solution. On addition of silver nitrate, to a fresh solution, 

 chloride of silver is precipitated, showing that chlorine is also 

 present. Gentle ignition developes no appreciable loss in the 

 weight of the mineral. 



The crystals are transparent to semi-opaque, with a white 

 waxy color inclining to yellow. Surfaces never highly polished 

 or very smooth. 



The definite formula deduced from Mr. Mackintosh's analysis, 

 taken together with the form, warrants me in announcing these 

 crystals as a new mineral species. I therefore propose for it 

 the name of Hanksite, after Prof. Henry G. Hanks, of Califor- 

 nia, than whom no man has done more to give to the world a 

 correct knowledge of the minerals of the great States of our 

 Pacific coast. 



Newark, N. J., May 23, 1885. 



