Sphenoidal Manganite
Sphenoidal Manganite
N'Chwaning II Mine, Kalahari Manganese Field, Northern Cape, South Africa
Size: 4.2 x 1.5 x 1.4 cm (Miniature)
The specimen has sphenoidal manganite on a small piece of manganese ore body. The manganite has a vertically stacked series of thin and shallow tabular pyramidal plates culminating in four sided shallow pyramidal terminations in a metallic grey black sheen with crystals to 0.7cm. This is one of the rarer forms of manganite from the locality.
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SKU:SAMS-267
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Mineral Sizing Guide
Understanding mineral sizes can help you choose the perfect specimen for your collection. Below is our guide to the standard size categories we use:
| Category |
Size |
Info |
| Thumbnail |
Up to 3 cm |
Thumbnails are small but well-formed mineral specimens that are perfect for display in thumbnail cases. |
| Miniature |
Up to 5 cm |
Great balance between size and detail - larger than thumbnails but still compact enough for easy storage and display. |
| Small-Cabinet |
Up to 9.4 cm |
Small-cabinet specimens offer larger crystal formations while still being easy to handle and display. |
| Cabinet |
Over 9.4 cm |
Ideal for prominent display pieces in a collection. Larger crystal formations and structure. |
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