Several intensely emerald-green dioptase crystals sit on a finely drusy quartz matrix colored reddish to pink. The strong contrast between the lustrous green crystals and the warm-toned matrix defines the visual character of this specimen.
The dioptase crystals reach several millimeters in size and are freely distributed across the crystalline surface. This creates a three-dimensional display side on which the individual crystals stand out clearly from the pale to reddish-brown quartz matrix
Dioptase from N’tola Mine near Mindouli
N’tola Mine is located near Mindouli in the Pool Department of the Republic of the Congo. The locality is known for dioptase crystals on different types of matrix. Dioptase and quartz are documented from the mine.
The reddish coloration of the finely crystalline quartz matrix is probably caused by iron-bearing mineral components or staining. This visually distinguishes the specimen from many examples with predominantly pale matrix.
With dimensions of 6.9 × 5.0 × 4.0 cm and a weight of 120 g, this is a compact small cabinet specimen. Its particular appeal lies in the emerald-green dioptase crystals and their strong color contrast with the reddish quartz matrix.
| Feature | Description |
|---|---|
| Mineral | Dioptase |
| Associated Mineral / Matrix | Quartz |
| Locality | N’tola Mine, Mindouli, Pool Department, Republic of the Congo |
| Dimensions | 6.9 × 5.0 × 4.0 cm |
| Weight | 120 g |
| Size category | Small cabinet specimen |
| Color | Dioptase emerald green; quartz matrix white, pink to reddish brown |
| Luster | Vitreous on dioptase |
| Transparency | Translucent to locally transparent |
| Crystal Form | Short-prismatic dioptase crystals |
| Matrix | Finely drusy, reddish-colored quartz matrix |
| Morphology | Several freely positioned dioptase crystals on crystalline quartz |
| Special Feature | Emerald-green dioptase on contrasting reddish quartz matrix |
| Mineral | Dioptase |
|---|---|
| Color | Green |
| Size | Small cabinet specimen (5-7 cm) |
| Continent | Africa |
| Country | Republic of the Congo |
| Feature | Classic locality |
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