MBRC-1 Spherical  Plectonema boryanum Cubic and octahedral [42, 43] UTEX 485 Platelet Pseudomonas aeruginosa --  Pseudomonas aeruginosa Crystalline and [12,14] needle-like Pseudomonas fluorescens Spherical  Pseudomonas putida Spherical  NCIM 2650 Pseudomonas Hexagonal,  stutzeri AG259 equilateral triangle, crystalline silver, and monoclinic silver sulfide acanthite
Rhodobacter sphaeroides Spherical  Rhodopseudomonas capsulata Nanoplate and [15, 49] spherical Rhodopseudomonas palustris Crystalline,  face-centered cubic Serratia nematodiphila spherical, and  crystalline Shewanella algae elemental  Shewanella algae --  strain BRY Shewanella putrefaciens Fine-grained  (Gs-15) crystal Thermoanaerobacter Octahedral [13, 54] ethanolicus TOR-39
3] solution showed that some peaks could be indexed to acanthite
and silver-3 C.
Daniel showed me some mind-bendingly fine specimens of acanthite
and wire silver which have just come from the Hongda mine, Linqqiu County, Datong Prefecture, Shanxi Province: sharp, lustrous metallic gray acanthite
crystals to 2 cm form stately stacks to 7 cm, and wonderful thick silver wires rise from matrix of massive acanthite
; this matrix is adorned, in a few cases, by gemmy 1.
Although individual crystals in a new lot of specimens offered by Horst still are small (to 2 mm or so), they are of a brighter red, and look somehow much more promising for the future: the proustite occurs as solid druse coverages over gray acanthite
, and very nice matrix thumbnails and miniatures could be had in Munich for 40 to 120 euros.
But the basic equations (Bakewell, 1984) for the patio processing of acanthite
were as follows:
In the first decade of the 20th century, the Las Chispas mine near Arizpe in Sonora produced some of Mexico's largest and best specimens of polybasite crystals, large clusters of "poker chip" stephanite crystals, fine acanthite
crystal clusters and a few very fine pyrargyrite specimens.
Assay results for the holes are still pending, however the sections have coarse grain galena, sphalerite and rare ruby silver as well as electrum and acanthite
, which is usually an indication of promising metal grades.
Since the turn of the century, fantastic specimens of wulfenite, calcite, amethyst, pyrargyrite, acanthite
, galena, gypsum--the list goes on and on--have made their way to collections across the globe.
Within the structure of the quartz vein, narrow high grade zones with visible acanthite
(silver sulfide) and gold contain up to 1,485 g/t Ag and 61.
The history of Guanajuato can be traced to a group of Spanish mule skinners who found silver there in 1548, Mining began in 1558 at the San Juan de Rayas mine, which since then has produced large numbers of superb specimens of acanthite
, polybasite and other silver minerals.
The locality is the Uchucchacua mine, Oyon Province, Lima Department, already famous for its acanthite
, silver, proustite and "arsenpolybasite" specimens.
At El Pino silver occurs as Acanthite
(Ag2S) and electrum, a natural alloy of gold and silver (Au,Ag).
pseudomorphs after thick native silver wires to about 1 cm long rise from calcite druses, together with small crystals of acanthite
paramorphous after argentite.
Mineral associations are commonly argentite, acanthite
, native silver, sphalerite, galena, chalcopyrite and pyrite.
Now, precisely because of the brightness, tin-whiteness, and thinness of these silver wires, and because of the acanthite
matrix, some people inevitably have been thinking about the fake silver specimens Don Edwards once made by roasting acanthite
in his kitchen.