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Description
Epidote with well-formed prehnite sphereLocale: Imilchil, Midelt Province, Dra Tafilalet Region, Morocco Approx dimensions: 2. 5 x 1. 5 x 1. 25" Approx weight: 115g After some sleuthing on Mindat I was intrigued to discover the spherical formation on this specimen is prehnite. I actually didn't find one matching this specimen anywhere; all examples were translucent and not opaque. I suspect it could be a feldspar pseudomorph. Prehnite typically does not fluorescebut this one does. Prehnite
Locale: Imilchil, Midelt Province, Drâa-Tafilalet Region, Morocco
Approx dimensions: 2.5 x 1.5 x 1.25"
Approx weight: 115g
After some sleuthing on Mindat I was intrigued to discover the spherical formation on this specimen is prehnite. I actually didn't find one matching this specimen anywhere; all examples were translucent and not opaque. I suspect it could be a feldspar pseudomorph. Prehnite typically does not fluoresce—but this one does.
Prehnite and epidote commonly grow together because they have similar chemical requirements (both need calcium and aluminium, and often grow in hydrothermal environments). This is far from the version that comes to mind for most people. Prehnite is most frequently found as a translucent light green with a botryoidal habit, pierced by or growing alongside dark green crystals of epidote (like this). Instead this prehnite is an opaque sand-colored sphere formed of radiating crystals terminating in thin, rectangular ends. The sphere is fairly complete with one cleanly broken side revealing the radial growth pattern.
Epidote grows long slender prismatic crystals with saturated olive green color, though it can be more yellow, brown, or even so saturated it appears black. Radial growth forms are typical of the Imilchil region in Morocco. It’s common to find fans and bow-ties of epidote mixed in with individual crystals. This piece has several good bow-ties around the sphere. Epidote has a good luster which is apparent with the larger crystals on the specimen.
UV reactivity: the epidote is non-reactive but the prehnite sphere glows a light golden yellow in 365nm UV light.
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