A very interestingly shaped sample of the manganese oxide hollandite from Morocco. Manganese oxides are very difficult to distinguish from each other by sight; this sample has been analyzed in a laboratory.
A very interestingly shaped sample of the manganese oxide hollandite from Morocco. Manganese oxides are very difficult to distinguish from each other by sight; this sample has been analyzed in a laboratory.
| Weight | 299 g |
|---|---|
| Dimensions | 71 × 88 × 138 mm |
