Specimen #1006

Name: Siderite on Arsenopyrite

Type: Micromount

Locality: Homestake Mine, Lead District, Lawrence Co., South Dakota, USA

Favorite? N

Fluorescent? N

Size:

Weight:

Acquired: 2008-11-23

Source: Ian Heales Collection

Label: N

Comment: Arsenopyrite is an iron arsenic sulfide (FeAsS). It is a hard (Mohs 5.5-6) metallic, opaque, steel grey to silver white mineral with a relatively high specific gravity of 6.1.Arsenopyrite also can be associated with significant amounts of gold. Consequently it serves as an indicator of gold bearing reefs. Many arsenopyrite gold ores are refractory, i.e. the gold is not easily liberated from the mineral matrix.

Minerals: Arsenopyrite (FeAsS) Siderite (Fe⁺⁺CO₃)

There is one picture on file

M01006-01.jpg:

Siderite on Arsenopyrite, Homestake Mine, Lead District, Lawrence Co., South Dakota - FOV: 7.4 x 3.6 mm (12 stacked images)