Lustrous, white flattened rhombohedrons of Calcite forming stacks to 5 x 2 mm are partly covered with brassy, modified cubes of Pyrite to 2.5 mm. This thumbnail is in excellent condition, with Ed Swoboda's original mounting. It was held back by Ed since the early 1970, and I purchased it in the early 1990s for my personal collection. No damage.
ex. Ed Swoboda specimen