The Arkenstone
Origin: Butte, Montana, U.S.A.
Sample size: 4.5 x 3 x 2.2 cm
Bright metallic silver crystals of tennantite to 4 mm in size scattered richly
about a bladed white
barite
matrix
Origin: San Genaro mine, Huancavelica Department, Peru
Sample size: 7 x 5 x 3 cm
Specimen with slender scalenohedral (rare), yellowish to dark red colour-zoned
crystals to 1.5 cm with a large 1.5 cm octahedral tennantite crystal covered
by dark green
duftite(?).
Origin: Tsumeb mine, Tsumeb, Namibia
Ex. Prosper Williams Collection
Sample size: 6 x 4 x 4 cm
Dozens of tetrahedra to 1-2mm. These crystals are rimmed with perhaps a
different mineral, possibly
chalcocite. The cores are a brilliant silver, while the rims are a
brassy
chalcocite colour and the outer rim is a dull, pitted, black or dark
grey. There are numerous minute clusters of
quartz
about the matrix.
Origin: Leonard mine, Silver Bow Co., Montana, United States
Ex. Kidwell collection
Sample size: 6 x 3 x 3 cm
