348 Palache and Warren — KrohnMte, JVatrochalcite. 



Of the remaining minerals listed on the first page as occur- 

 ring in this material there is little to note of special interest. 

 Brochantite is sparingly present in acicular crystals implanted 

 on or surrounded by krohnkite. Atacaraite is in green and 

 deep blue-black crystals of ordinary prismatic and tabular 

 habits ; also in crystals elongated parallel to the brachyaxis 

 with nearly equal development of the forms m, e, r and n. 

 Chalcanthite is in the form of granular crusts, copiapite and 

 botryogen in granular masses of no distinct form and sideron- 

 atrite in yellow needles. Halite in small cubes was present on 

 one specimen of blodite and gypsum is shown in a coarse 

 granular form saturated with finely divided hematite and also 

 in aborescent crystallizations of snow-white color, closely resem- 

 bling cave-formations of calcite. 



Cambridge, June, 1908. 



