Azurite and Malachite cast after Gypsum (rare)

Item Description

An outstanding and rare epimorph (type of pseudomorph) from this well-known Utah locale. Bright royal-blue azurite with an external malachite coating replaces the gypsum and the original gypsum dissolves away, leaving a hollow cast surrounded by the new minerals. The Apex Mine is known for this material, but it is very seldom available and only out of old collections. Older material from the 1950s or early 60s. Valued at $750-900 today, as that is what the rare comparables which turn up time to time sell for.