Groutite In Manganese Nodule
Unknown Owner
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This is an OUTSTANDING specimen of crystallized groutite in huge crystals and in a rich quantity, as well. The cluster of crystals measures 3.5 x 3 cm and fills half of a hollow vug inside this manganese nodule (part remains packed with hardened kaolin clay). The overall specimen is important for the species, but also interesting for the environment, and how it shows the crystals formed inside a hollowed nodule of the manganese. It displays nicely (or upside down, as a rounded lump with a surprise inside). When I first saw this specimen I was sure it was perhaps manganite or some other species, as groutite seldom forms such large crystals, nor such rich masses.
Product details
Known provenance
| Date | Collector | Acquisition price |
|---|---|---|
| 08/2024 | Unknown Owner | Not disclosed |
| — | The Arkenstone | Not disclosed |
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Mineral guide
Learn about Manganese
Native manganese a rare native-element specimen prized by advanced collectors for its silvery luster, tiny grains, and provenance; misidentifications lower val…Regional guide
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