RHODOCHROSITE

ABOUT THE SPECIMEN

Full coverage of gemmy, rich, raspberry red rhodochrosite hosted atop a bed of manganite matrix. A majority of the crystals are formed as tightly bunched clusters of scalenohedra which are truncated to give the tops of the clusters an almost rounded look, while still showing sharp faces along the sides. Some tiny quartz growths are visible atop the crystals and around their bases. This particular growth style is both highly desirable and characteristic for the Hotazel Mine, which preceded the finds at the N'Chwaning Mines. Individual scalenohedra are also present throughout, and the excellent translucency makes it absolutely glow with backlighting! Although it was sold to us as having come from the N'Chwaning mines, we can, again, say that it's almost certainly older Hotazel material based on style. Some very minor nicks and edge wear are present, yet it feels like splitting hairs to mention, considering in how good of condition it is for this material. For a locality whose specimens frequently reach five- and six-figure range prices, this is an excellent and more affordable example.

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The Hotazel Mine produced rhodochrosite specimens during brief finds in the mid-to-late 1970s that remain distinct from the better-known N'Chwaning material. These crystals form as scalenohedral and occasionally truncated scalenohedral forms, typically reaching 1-1.5 cm in length, with colors ranging from cherry-red to salmon-pink depending on iron substitution in the structure. The specimens occur in vugs within massive manganese oxide ore, most commonly associated with hausmannite and manganite, occasionally with braunite and gypsum. What makes Hotazel rhodochrosite geologically significant is its connection to the ~2.4 billion-year-old Hotazel Formation - one of Earth's oldest major manganese accumulations, deposited during the Great Oxidation Event when atmospheric oxygen first rose to appreciable levels. The crystals formed much more recently through relatively shallow oxidation processes, but their host rocks record a critical transition in planetary history. For collectors, prime Hotazel specimens are considerably rarer than the subsequent N'Chwaning finds, with most material collected hastily by miners unfamiliar with specimen preservation. The characteristic luster and color saturation of 1970s Hotazel pieces, particularly those with hemispherical or mounded crystal aggregations, haven't been matched by later production from the field.