English: A classic thumbnail specimen of the famous pieces of fowlerite (a zinc-bearing variety of rhodonite) from the Franklin Mine. It's important to note that fowlerite was at one time a valid species, mostly because fine crystals of rhodonite were almost completely unheard of prior to the discovery of the crystals from Franklin. Typically, fowlerite will have a slightly different color than the actual rhodonite crystals, with more of a brownish overtone as opposed to the saturated pink hue we're used to seeing from Franklin. This piece features a sharp, well-formed, 9 mm crystal of fowlerite sitting aesthetically on calcite matrix. The fowlerite crystal has a rough "contact termination" on the top, so it's not 100% complete, but it's still a very nice example of this hard to find classic material. The calcite shows a glowing red fluorescence under UV light. From the collection of Frank Keutsch.