Vivianite Crystal Cluster in Matrix – São Gabriel da Cachoeira, Brazil – 0.59 lbs

A dramatic Vivianite crystal specimen from the São Gabriel da Cachoeira area of Amazonas, Brazil, featuring elongated blue-green crystals emerging from a richly textured iron-bearing matrix. Its tall architectural profile and intense color make this an exceptional display specimen from one of Brazil’s best-known vivianite-producing regions.

The formation is dominated by a substantial intergrown crystal group rising diagonally across the matrix. Broad bladed faces, strong lengthwise striations, stepped growth features, and glassy reflections give the crystals remarkable visual depth. In ordinary lighting they appear nearly black, navy blue, or forest green; under focused illumination, translucent sections reveal vivid emerald, teal, and electric blue-green color.

Smaller vivianite crystals and partial blades continue across the lower matrix and along both sides of the primary formation. Portions remain partly embedded, preserving the relationship between the crystals and their original growth environment. The contrasting matrix ranges from dark brown and charcoal to ochre and rusty orange, with earthy coatings, recessed pockets, and rounded iron-rich surface textures.

The reverse is predominantly natural matrix, displaying an intricate granular-to-botryoidal surface in brown, mustard, and orange tones. This heavily mineralized host creates a striking backdrop for the highly reflective vivianite.

Measuring approximately 3 × 1.5 × 5.5 inches and weighing 0.59 pounds, this tall specimen combines substantial crystal size, saturated color, brilliant luster, and strong natural contrast.

Specifications

Mineral: Vivianite

Formation: Large intergrown bladed vivianite crystals in natural iron-rich matrix

Locality: São Gabriel da Cachoeira area, Amazonas, Brazil

Weight: 0.59 lbs, approximately 268 grams

Dimensions: Approximately 3 × 1.5 × 5.5 inches

Color: Deep blue-green, emerald green, teal, navy blue, blue-black, rusty brown, ochre, and orange

Crystal Habit: Elongated prismatic-to-bladed crystals with parallel growth and pronounced longitudinal striations

Luster: Vitreous to highly reflective

Transparency: Translucent along thinner crystal sections and edges; otherwise dark and nearly opaque

Matrix: Earthy brown-to-ochre iron-rich material with granular, recessed, and rounded surface textures

Chemical Formula: Fe₃(PO₄)₂·8H₂O

Mineral Class: Hydrated iron phosphate

Crystal System: Monoclinic

Mohs Hardness: Approximately 1.5–2

Display Size: Tall cabinet specimen

Condition: Natural mineral specimen with inherent crystal contacts, cleavage features, incomplete or contacted terminations, surface deposits, matrix attachment, edge irregularities, and color variation associated with natural growth and extraction

Exact specimen shown

About Vivianite

Vivianite is a hydrated iron-phosphate mineral valued for its intense blue-to-green coloration and highly reflective bladed crystals. Fresh material may initially be pale or nearly colorless, but exposure to oxygen and light can gradually deepen its color through natural oxidation.

Because vivianite is soft, cleavage-prone, and light-sensitive, display this specimen away from direct sunlight and strong ultraviolet exposure. Handle it by the solid matrix, avoid water and chemical cleaners, and remove dust only with gentle air or an exceptionally soft, dry brush.

Collector Notes

• Large Brazilian vivianite crystal group
• Deep blue-green color with vivid emerald illumination
• Broad, reflective bladed faces
• Strong longitudinal striations
• Multiple intergrown and partially exposed crystals
• Dramatic contrast against rusty iron-rich matrix
• Tall 5.5-inch architectural profile
• Natural matrix preserved across the reverse
• Exact specimen pictured

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You will receive the exact specimen shown.
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