5 ("Mexico II"); the 7-cm cluster of proustite crystals from Chanarcillo, Chile; the finest extant specimen of spangolite
from Bisbee, Arizona; and others almost as well known.
And finally there were specimens of superbly well crystallized atacamite, paratacamite, connellite, claringbullite, spangolite
, and other very rare secondary chlorides--23 species in all (see Graeme, 1993).
Terry told me that only the guanacoite's prismatic crystal habit distinguishes it visually from spangolite
, which can have the same color and cleavage.
Copper species collectors swooned over a spangolite
(correction: THE spangolite
!) in their display.
The only known South American spangolite
was collected in 1996 at th e Rosalia mine, far to the east of Inca de Oro.
Probably the most interesting specimens are those found in silicified wood, associated with volborthite, several arsenates and, in places, connellite and spangolite. The acicular variety is also widespread, particularly at the Gambatesa mine.
Fine specimens of spangolite
, brochantite, creedite, cyanotrichite, fluorite, linarite, tsumebite and wulfenite have been recovered.
The browser today may be surprised to notice that the collection, while in general overwhelmingly skewed toward old localities in Europe and the eastern United States, possesses also great strength in classic Bisbee, Arizona, material: generous numbers of very fine azurite, pseudomorphous malachite, cuprite and calcite specimens, and what is surely one of the world's best two or three miniatures of spangolite
. Apparently this Bisbee plethora is a result of an early connection between Benjamin Silliman Jr.
Colorful specimens of grass-green brochantite, often associated with the very rare spangolite
from the Blanchard mine and nearby Mex-Tex mine, are highly sought after by mineral collectors from around the world.
A case in point is the type specimen of spangolite
(a copper aluminum sulfate hydroxide chloride hydrate).
A fine spangolite
was among the specimens given to the British Museum.