A Geoscience Digital Image Library

TitleArsenopyrite from Deloro, Ontario, Canada
DescriptionThis specimen (13 cm across) contains lots of quartz. The darker parts of the sample are gray arsenopyrite (FeAsS) mixed with gold (and somewhat tarnished) pyrite (FeS2) and quartz (SiO2). Pyrite is an ore mineral for iron, and arsenopyrite is a major ore of arsenic. Quartz, typically is gangue (meaning it is a valueless mineral found with ore minerals). Arsenopyrite sometimes indicates the presence of gold, and so when it is present it gets miners excited. When struck or heated, arsenopyrite gives off a distinct garlic odor which alerts miners to its presence even if it is too fine grained to see.
LocationCanada. Near Deloro.
PhotographerDarla Sondrol. 2001-07-11.
CollectionUniversity of North Dakota Mineralogy Collection #228.
Key wordsarsenopyrite, Ontario, Canada
Tech details964 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number1130