Unnamed Arsenic Sulfide (As2S5)
Image: <a href="//commons.wikimedia.org/w/index.php?title=User:Ppm61&action=edit&redlink=1" class="new" title="User:Ppm61 (page does not exist)">Зеленский Михаил Евгеньевич</a> (CC BY-SA 4.0)
Mineral NameUnnamed Arsenic Sulfide (As2S5)
Chemical FormulaAs2S5
Crystal Systemamorphous
Streak Coloryellow-orange
CleavageNone
Fractureconchoidal to uneven
Colorsorange, yellow, reddish-brown
Transparencytranslucent to opaque
Type LocalityMutnovsky volcano, Kamchatka
Mineral GroupSulfides
Usesscientific research, collector's item
Associated MineralsUnnamed ammonium arsenic iodide mineral (NH4As4O6I)
Rarityvery-rare
Description
An electron micrograph showing intricate, 'ice cream cone' shaped structures of an unnamed amorphous arsenic sulfide mineral, predominantly orange and yellow, formed as volcanic sublimates. Small colorless hexagonal crystals of another unnamed ammonium arsenic iodide mineral are also visible.
Geological Context
These minerals form as fumarolic incrustations through sublimation from volcanic gases and droplets of water at Mutnovsky volcano, Kamchatka. Their intricate forms are a result of growth from gradually increasing water droplets.
