Lustrous Malachite Pseudomorph after Azurite – Onganja Mine, Namibia (58mm)

The Pseudomorph

The sharp, blocky, and tabular shapes seen in the center of the piece are characteristic of Azurite’s monoclinic crystal system. While the mineral is now green (Malachite), the “skeleton” belongs to the original Azurite. This is what collectors call a “pseudo,” and Onganja is famous for producing some of the world’s best examples.

Texture & Color

• Velvety Texture: The surface appears to be a “fibrous” or “velvety” malachite, consisting of millions of tiny acicular (needle-like) crystals that give it that deep, matte forest-green look.

• Associated Minerals: The small, translucent white-to-clear crystals scattered across the top and sides are likely Calcite or Quartz, which provide a beautiful visual contrast to the dark green.

Product Description

Title: Lustrous Malachite Pseudomorph after Azurite – Onganja Mine, Namibia (58mm)

Description: Discover the fascinating chemistry of the Tsumeb-area mines with this striking Malachite pseudomorph from the historic Onganja Mine. This specimen features a bold, structural cluster of large Azurite crystals that have been completely replaced by rich, deep-green Malachite.

The replacement has perfectly preserved the sharp, tabular morphology of the original Azurite, creating a “crystal fossil” of incredible detail. The surface is coated in a fine, velvety druse that catches the light beautifully, accented by small, sparkling white Calcite crystals. A classic “must-have” for collectors of Namibian minerals or those fascinated by pseudomorphism.

• Locality: Onganja Mine, Seeis, Windhoek District, Namibia

• Size: 58mm (Cabinet Display Size)

• Type: Pseudomorph (Malachite after Azurite)

• Color: Deep Forest Green with White accents

Collector’s Note

Onganja is perhaps most famous for its giant Cuprites, but these Malachite-after-Azurite pieces are the “bread and butter” of a high-quality Namibian collection. Because they are no longer being mined in large quantities, specimens with this level of structural definition are becoming harder to find.