List Of Minerals Recognized By The International Mineralogical Association (A)
__TOC__ A Aa – Ak #Abellaite (IMA2014-111) 5.BE o o(IUPAC: sodium dilead hydro dicarbonate) #Abelsonite (IMA1975-013) 10.CA.2

(IUPAC: a nickel porphyrine derivative) # Abenakiite-(Ce) (IMA1991-054) 9.CK.1

o# Abernathyite (natroautunite: 19 ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Acanthite - Chispas Mine, Arizpe, Sonora, Mexico
Acanthite is a form of silver sulfide with the chemical formula Ag2S. It crystallizes in the monoclinic system and is the stable form of silver sulfide below . Argentite is the stable form above that temperature. As argentite cools below that temperature its cubic form is distorted to the monoclinic form of acanthite. Below 173 °C acanthite forms directly. Acanthite is the only stable form in normal air temperature. Occurrence Acanthite is a common silver mineral in moderately low-temperature hydrothermal veins and in zones of supergene enrichment. It occurs in association with native silver, pyrargyrite, proustite, polybasite, stephanite, aguilarite, galena, chalcopyrite, sphalerite, calcite and quartz. Acanthite was first described in 1855 for an occurrence in the Jáchymov (St Joachimsthal) District, Krušné Hory Mts ( Erzgebirge), Karlovy Vary Region, Bohemia, Czech Republic. The name is from the Greek "akantha" meaning thorn or arrow, in reference to its crystal shap ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]