Cobaltoan Calcite with Green Mineral

Description

A long band of sparkling pink Cobaltoan Calcite crystals with vivid green mineral patches across a pale natural matrix.

This elongated 398 g Kolwezi specimen carries a band of pink Cobaltoan Calcite crystals across one side of its pale natural matrix. Sparkling crystal faces and scattered green mineral patches create strong colour contrast. The other side shows the thickness and texture of the host rock.

The green mineral has not been confirmed by analysis and is described by its appearance. The pink colour of Cobaltoan Calcite is associated with cobalt in the Calcite structure. The exact specimen shown in the photographs and video is the piece offered.

Locality: Kolwezi Mining District, Lualaba Province, Democratic Republic of the Congo.

Condition and photography: Natural contacts and matrix edges are visible. Please inspect every view for details. Colours can vary with lighting and screen settings. Handle from beneath the matrix and avoid acids.

The contrasting coatings described for this specimen contribute to its texture and outline. They draw attention to the relationship between the featured crystals and the material around them. Areas of exposed crystal and covered growth give different reflections, adding interest beyond the main colour without requiring an identification of every small coating from appearance alone.

Calcite is calcium carbonate, a mineral with an unusually wide range of crystal forms. It occurs in sedimentary rocks, mineral veins and many other geological settings. Although the composition remains broadly the same, differences in growth conditions can produce dramatically different outlines, from broad faces to slender or densely grouped crystals. This variety is part of its interest for a mineral collection.

Calcite has well-developed cleavage: it can split along particular planes in its crystal structure. Its natural growth faces and cleavage surfaces therefore deserve careful distinction. Transparent, translucent and more opaque examples all occur. The shape, arrangement and surface character of this piece are more informative than colour alone, especially when comparing specimens from different localities.

The recorded origin is Kolwezi Mining District, Lualaba Province, DR Congo. Within a collection of Calcite specimens, this locality gives the piece a geographical identity alongside its particular crystal habit and natural setting.

The specimen measures 120 × 60 × 50 mm, with a recorded weight of 398 g. The proportions give a useful guide to its place in a display, with the individual crystal arrangement and mineral association remaining the principal points of interest.

Calcite is relatively soft and has pronounced cleavage, so support the stable part of the specimen when moving it. Avoid pressure on thin plates or projecting points. A secure display helps preserve the delicate edges and the arrangement of growth described for this piece.