276 Copper Minerals from Arizona. 



flat nail-head crystals of caleite, also transparent, measuring 35 

 mm. in width. 



In some instances, groups of these malachite crystals pearly 

 25 mm. across, penetrate the pellucid caleite, forming one of 

 the most beautiful of mineral combinations, a malachite coun- 

 terpart to the native copper in caleite from Lake Superior. 



Malachite from the Copper Queen mine, forms thick crusts 

 and seams, geodes and cavities over one foot across, and entirely 

 made up of fine acicular, velvety crystals — these often two to 

 four mm. long — the whole surface presenting the rich sheen of 

 a green plush velvet. No locality has furnished finer specimens 

 of this form. 



Azurite. 



Azurite from the Clifton mines, Graham County, Arizona, 

 and also from the Longfellow mine, occurs in beautiful groups 

 from 1 to 12 mm. in diameter, and of a dark blue color. One 

 form of the larger crystals is 0. I 2 . I. 



One spherical group radiating from a centre in all directions, 

 consists of crystals 20 mm. long and 7 mm. thick, partially 

 altered to malachite on the surface. Indeed, this mineral is 

 here found in all stages of transition, some entire groups in 

 large crystals being completely altered to malachite. Perhaps 

 the finest group of azurite ever found on this continent is in- 

 cluded here, measuring 25 cm. in height and 7.5 to 15 cm. 

 across. It is covered on both sides with brilliant dark blue 

 crystals from 5 to 12 mm. long. Very interesting perfect 

 spheres of azurite are found here, composed of small crystals, 

 and associated with beautiful spheres of malachite, pseudomorph 

 after azurite. 



Azurite coated with malachite was observed, and beautiful 

 groups of perfect spheres 15 mm. in diameter, and of a rich 

 Berlin blue color. Azurite from the Copper Queen mine is 

 usually in the form of small crystals from .5 mm. to 5 mm. across, 

 in delicate druses, or in compact mammillary masses about 12 

 mm. thick, or in radiations. 



Chrysocolla. 

 This mineral is found of a beautiful turquoise-blue or green- 



