Natural Pink Cobaltoan Calcite Crystal Cluster on Matrix · 199 g · Collector Specimen

$99.57

Natural Cobaltoan Calcite crystal cluster on matrix weighing approximately 199 g and measuring around 7 × 5 cm. The specimen displays vivid pink cobalt-bearing Calcite crystals with attractive reflective surfaces, contrasted by darker and earthy matrix tones. Untreated and unpolished, with natural crystal growth, contact features and matrix irregularities preserved. A distinctive one-of-a-kind collector mineral specimen.

1 in stock

NGB Reference: NGB-000424 SKU: CL-CALC026MC-003-422 Category: Brand:
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This striking natural Pink Cobaltoan Calcite crystal cluster weighs approximately 199 grams and presents vivid pink Calcite crystals developed across a contrasting natural mineral matrix.

Measuring approximately 7 × 5 cm, the specimen combines strong colour with well-defined natural crystal growth, creating an attractive three-dimensional formation suitable for mineral collection or display.

Cobaltoan Calcite is a cobalt-bearing variety of Calcite, recognised for its characteristic pink to intense rose-pink coloration. The presence of cobalt within the Calcite structure is responsible for the distinctive colour that separates this material visually from more common white or colourless Calcite.

The crystal surface shows a lively vivid pink colour, accompanied by darker mineral accents and earthy matrix tones. These contrasting components provide visual depth and help emphasise the natural development of the pink Calcite across the specimen.

Under direct illumination, the crystal faces produce attractive reflective highlights and a delicate sparkle characteristic of well-developed Calcite surfaces. Differences in crystal orientation cause the specimen to reflect light differently from multiple viewing angles.

The piece remains in its natural crystal formation, preserving original crystal faces, matrix contacts, growth structures and surface textures. Small fissures, incomplete crystal edges, contact points, minor abrasions or irregularities may occur and are normal characteristics of an untreated mineral specimen.

At approximately 199 g, the specimen has substantial presence while remaining compact enough for cabinet display, desk presentation or inclusion within a curated mineral collection.

The combination of vivid pink colour, naturally contrasting matrix and expressive crystal growth makes this a distinctive individual collector piece.

This is a unique specimen, and the buyer will receive the exact natural formation shown in the product photographs.

With its vivid natural pink colour, contrasting matrix and sparkling crystal development, this 199 g Cobaltoan Calcite cluster offers strong collector appeal and distinctive visual character. Its combination of colour, crystal texture and natural matrix makes it an attractive specimen for a mineral collection, cabinet display or refined interior presentation.

Overall Score: 90/100

NGB Grade: Excellent

Quality Evaluation

Color19.0/20
Material Quality18.0/20
Natural Characteristics18.0/20
Shape, Symmetry & Polish17.0/20
Overall Appeal18.0/20

Evaluation Notes

This natural Cobaltoan Calcite cluster presents an **excellent overall collector-quality profile**, combining vivid pink colour with attractive crystal development and a well-balanced natural matrix. The cobalt-bearing Calcite shows strong visual contrast against the darker and earthy matrix components, giving the specimen good depth and three-dimensional character.

The crystal surfaces display appealing reflective sparkle and natural growth structure, while minor contact marks, cleavage-related features and matrix irregularities remain consistent with an untreated mineral specimen. The overall formation is visually coherent and retains strong natural authenticity.

The combination of **colour intensity, crystal development, matrix contrast, natural structure and overall presentation** supports an **excellent 90/100 assessment**.

Species

Calcite

Gemstone Variety

Calcite

Gemstone Sub-variety

Cobaltoan Calcite

Treatment

Unheated, Untreated

Color

Multicolor

Gemological Properties

Dimensions7 x 5 cm
TransparencyTransparent
Refractive Index1.486–1.658
Specific Gravity2.70–2.75
Hardness3 Mohs
Birefringence0.172
Crystal SystemTrigonal
DispersionLow; not normally a major diagnostic feature
LusterVitreous to pearly
Color Descriptionvivid pink with natural earthy and dark mineral accents
Transparency NotesTransparency varies across the natural crystal formation according to the dominant mineral and individual specimen.
Natural CharacteristicsCobaltoan Calcite may display: Natural crystal zoning Variations in pink colour intensity Internal fissures and cleavage-related features Growth lines and crystal-face irregularities Associated dark or earthy matrix minerals Small contact marks or incomplete crystal terminations Drusy or botryoidal crystal development These features are typical of natural crystal clusters and contribute to the specimen’s geological character.

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