Bournonite (“cogwheel”) on matrixFinding a fine quality "cogwheel" such as this on matrix from Machacamarca is not common, and the photos honestly do not do this piece justice as it is much more eye catching in person. This piece features a few attractive "cogwheel" twinned crystal groups of Bournonite with superb luster sitting atop a matrix of micro Pyrite, Quartz and Sphalerite. The "cogwheels" feature dozens of discreet, striated "cogs" that form the edge of the fairly thick

simply put

which was supposed to be an intermediary species between Ferberite and Hubnerite

and aesthetic to be sure

It's still a very showy specimen of this classic material

the color of the Brookites is a deep orange-red (best seen with backlighting) which contrasts wonderfully with the black "phantoms"

peach-yellow color crystals of this hard-to-find species on matrix

This piece is complete on all sides

The Henderson Mine is a MASSIVE commercial Molybdenum mining operation that runs 24 hours a day

metallic silvery sword shaped crystals of Stibnite forming a very aesthetic crystal “spray”

we will work with you to deliver in person

The piece comes from my father’s collection

This is a wonderful thumbnail specimen featuring a striking doubly-terminated 7 mm crystal of Brookite that is gracefully set among sharp