Acanthite ps Argentite
Posted by: macadmin on 05.14.2020 | Filed under:

Acanthite ps Argentite

Specimen # 100399
Mineral: Acanthite ps Argentite
Location: Acanthite ps Argentite, Imiter Mine, Djebel Saghro, Ouarzazate Province, Morocco
Size: 6.3 x 4.1 x 2.8 cm


Detailed Description

The only matrix specimen in the lot, this is very unusual for Imiter acanthites – it features two prominent acanthite crystals (pseudomorphs after argentite) on greyish quartz, with minor galena and smaller acanthites. The largest acanthite crystal measures 1.7 cm. There is a growth-hollow on the left hand side of the large acanthite, and some minor quartz on its right-hand side – neither is damage. Great matrix acanthite!

About These Acanthites

Well-crystallized acanthite has never been common and most of the known localities for crystals are historic, making it difficult, and usually expensive, to obtain fine specimens. The finds at Imiter (Africa’s largest silver mine) in recent years have placed Imiter among the world’s best localities for crystallized acanthite. Although these crystals formed as argentite, argentite is not stable below 179C, at which point it changes to monoclinic ¬†acanthite. The specimens are acanthite pseudomorphs after argentite, retaining the isometric crystal form of the original argentite crystals. I assembled this lot of acanthites over a period of about two years. Most of these specimens, from the 2008 find, remained in Morocco until 2013.

Additional information

Dimensions 63 × 41 × 28 cm