Natural Yellow Brucite Crystal Cluster · 134.80 ct · Collector Specimen

$89.45

Natural Yellow Brucite crystal cluster from Pakistan weighing approximately 134.80 ct / 26.96 g and measuring around 48.3 × 31.5 × 18.6 mm. The specimen features a concentrated development of bright yellow to honey-yellow Brucite with attractive translucent crystal mass, strong luster and contrasting natural matrix. Untreated and unpolished, with original crystal growth, cleavage-related features and matrix contacts preserved.

1 in stock

NGB Reference: NGB-000415 SKU: CL-BRUC024CL-100-110 Category: Brand:
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This attractive natural Yellow Brucite crystal cluster weighs approximately 134.80 carats / 26.96 grams and features a concentrated development of bright yellow Brucite across a contrasting natural rock matrix.

Measuring approximately 48.3 × 31.5 × 18.6 mm, the specimen has a compact but visually expressive form, with the yellow Brucite forming the principal focal point of the cluster.

The Brucite displays a strong bright yellow to yellow colour, with individual crystal aggregates producing attractive reflective highlights across the surface. The concentration of yellow mineral growth against the darker and more neutral host rock creates strong natural contrast and gives the specimen considerable decorative appeal.

Brucite is a naturally occurring magnesium hydroxide mineral, Mg(OH)₂, typically formed in magnesium-rich geological environments. It is commonly associated with metamorphic alteration of ultramafic rocks and serpentinite-related deposits, and may also occur in certain hydrothermal environments.

Highly attractive yellow Brucite has gained particular attention among mineral collectors through important discoveries in Pakistan, where strongly coloured specimens have become recognised for their vivid yellow appearance. Yellow remains one of the most visually distinctive colour expressions of collector-quality Brucite.

The crystal development on this specimen is concentrated effectively across the matrix, allowing the yellow mineral growth to remain clearly visible while preserving sufficient host rock to provide geological context and structural contrast.

The specimen remains in its natural rough and unpolished condition. Original crystal surfaces, growth textures, matrix contacts and natural irregularities are preserved. Minor cleavage-related features, contact marks, edge irregularities or small fissures may occur and are normal characteristics of naturally formed Brucite.

Because natural rough mineral specimens have irregular shapes, the stated dimensions are approximate and depend on the selected measuring points. They are provided as a practical indication of the specimen’s overall size.

Unique Piece: Natural individual formation

With its bright yellow Brucite, compact proportions and strong contrast against the natural rock matrix, this 134.80 ct specimen offers an attractive combination of mineralogical interest and decorative character. Its concentrated crystal growth and vivid colour make it well suited to both a curated mineral collection and refined natural stone display.

Overall Score: 94/100

NGB Grade: Excellent

Quality Evaluation

Color19.0/20
Material Quality19.0/20
Natural Characteristics18.0/20
Shape, Symmetry & Polish19.0/20
Overall Appeal19.0/20

Evaluation Notes

This natural Yellow Brucite cluster presents an **excellent overall collector-quality profile**, combining vivid bright yellow to yellow colour with concentrated crystal development and strong contrast against the natural rock matrix. The colour saturation is a major strength of the specimen and gives the cluster immediate visual impact.

The Brucite shows attractive platy to fibrous growth, layered crystal textures and appealing reflective surfaces, while the distribution of the mineral across the matrix creates a well-balanced and highly decorative formation. Minor cleavage-related features, fine fissures, contact marks and edge irregularities are consistent with natural Brucite and do not significantly detract from the overall presentation.

The combination of **strong colour, concentrated crystal coverage, attractive growth structure, matrix contrast and overall aesthetic balance** supports an **excellent 94/100 assessment**.

Species

Brucite

Gemstone Variety

Brucite

Treatment

Unheated, Untreated

Origin

Pakistan

Color

Multicolor

Gemological Properties

Carat Weight134.80 ct
Dimensions48.3 × 31.5 × 18.6 mm
TransparencyTranslucent
ClarityN/A
Refractive Index1.560–1.590
Specific Gravity2.39
Hardness2.5–3 Mohs
Birefringence0.020–0.022
Crystal SystemTrigonal
LusterVitreous to pearly
Color DescriptionGood balanced yellow crystal and grey base, mainly yellow dependingon point of view
Transparency NotesTransparency varies across the natural crystal formation according to the dominant mineral and individual specimen.
Natural CharacteristicsNatural **platy to fibrous Brucite crystal growth** is concentrated across the contrasting rock matrix, showing visible growth textures, layered structures and variations in crystal thickness. The specimen displays a strong **bright yellow colour**, with subtle differences in saturation between individual crystal aggregates. Minor cleavage-related features, contact marks, fine fissures and natural edge irregularities may be present and are consistent with the soft, perfectly cleavable character of Brucite. The concentrated crystal coverage and strong colour contrast contribute significantly to the specimen’s collector and decorative appeal.

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