Fine minerals & collector specimens
Avalon Crystals &Minerals

Thumbnail mineral specimen · One available

Reference: AC253

Dioptase with Fornacite · Thumbnail Specimen

N’tola Mine, Mindouli District, Republic of the Congo

£70

Minerals Dioptase with FornaciteDimensions Approximately 45 × 36 × 11 mmCrystal habit Intergrown blocky crystalsCondition Natural and unenhancedDisplay Bevelled glass base includedCertification card Avalon Crystals & Minerals specimen certification card included

About this Dioptase specimen

This Dioptase with Fornacite specimen forms a thin, irregular plate with a densely crystallised display face. Deep emerald-green crystals are packed closely together, with larger angular forms rising above smaller intergrown crystals. The outline narrows towards the top, giving the cluster a gently peaked silhouette.

Broad Dioptase faces alternate with finely textured surfaces and small recesses. Their glassy lustre produces bright reflections against the darker green interiors. Along thinner crystal edges the colour appears lighter and more translucent, while the deeper pockets between crystals remain almost black-green in the photographs.

The intergrowth is especially interesting across the centre of the specimen. Individual faces meet at different angles, creating a mosaic of flat reflective planes, stepped outlines and smaller crystal terminations. Some crystals project beyond the edge of the plate, so the side photographs help reveal the relief of a specimen that appears flatter from the front.

The recorded Fornacite association adds mineralogical interest alongside the dominant Dioptase. Fine associated growth can be examined between and around the larger crystals; the photographs show the differences in surface texture without obscuring the main crystal architecture. The appeal of this piece is its concentration of crystal detail across a relatively thin natural cluster.

The photographs show the exact specimen from several angles, allowing the main crystal face and the less reflective areas to be compared. This is a useful small specimen for studying how tightly intergrown crystals retain distinct faces within a continuous crystalline surface.

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