Crystalline Dioptase with Acicular Growth – 31mm

Crystalline Dioptase with Acicular Growth – 31mm

Locality: Republic of the Congo (DRC)

Dimensions: 31 mm x 27 mm

Mineralogical Profile

This specimen is a "best of both worlds" piece, combining large, blocky dioptase rhombohedra with a delicate, fibrous secondary mineral.

• Primary Mineral: Features sharp, intergrown Dioptase crystals with an intense vitreous luster. The crystals are unusually large for a 31mm specimen, showing deep emerald-green color with high translucency on the edges.

• Secondary Growth: A distinct, pale-green fibrous cluster (likely acicular Malachite) is nestled among the primary crystals. This "starburst" habit provides a fantastic textural contrast to the hard, geometric lines of the dioptase.

• Luster & Light Play: The blocky faces of the dioptase provide broad, mirror-like flashes, while the fibrous inclusion catches light in a soft, satin-like manner.

• Saturation: Exhibits the premier neon-teal saturation that collectors look for in Congolese specimens.

Technical Summary

• Mineral: Dioptase (CuSiO2​(OH)2​) with likely Malachite.

• Hardness: 5 (Dioptase) / 3.5–4 (Malachite).

• Crystal Habit: Rhombohedral crystals with a secondary acicular (needle-like) habit.

• Condition: Excellent preservation of the delicate fibrous structures.

Collector’s Appeal

This piece is a "specialty specimen." Collectors of mineral associations will particularly appreciate the fibrous growth, as it adds a layer of complexity beyond a standard dioptase cluster. It’s the kind of detail that makes a small specimen stand out in a competitive display.

Display Suggestion

To protect the delicate fibrous "needles," this 31mm piece should be displayed in a perky box or a glass-enclosed case. Use a macro-lens for your website photos to highlight that central fibrous cluster—it's a great selling point that proves the piece is a unique, natural occurrence.