This exceptional association specimen features a vivid teal-blue pentagonite crystal cluster, coated with transparent chalcedony, perched on a softly textured chalcedony matrix, accompanied by translucent heulandite crystals. The pentagonite forms sharp, angular aggregates with excellent color saturation—an immediate focal point against the neutral, granular chalcedony background.
Elongated, bladed heulandite crystals radiate naturally from the matrix, adding dimensional contrast and confirming a multi-stage mineralization process. The overall composition feels unmistakably authentic, A perfect unaltered example of rare zeolite-related mineral formation.
Dimensions: 2.5” x 2” x 1”
Weight: 112g
Pentagonite is sometimes associated with clarity and focused intention, while heulandite is often linked to reflection and inner awareness. Many collectors simply appreciate the calm yet striking color contrast of this natural pairing.
Collector’s Notes
Pentagonite is a rare calcium silicate hydrate, known almost exclusively from select Indian localities, and is seldom encountered with strong color and intact crystal form. Specimens featuring pentagonite, especially when clearly visible under chalcedony overgrowth, in clean association with heulandite are especially desirable due to their limited availability and visual clarity. This piece is ideal for collectors focused on rare species, secondary silicates, and classic Indian associations.
Bright blue-green pentagonite crystal
Associated heulandite on chalcedony
Clear multi-mineral, multi-stage formation
Rare species with strong color expression
Chalcedony over rare Pentagonite
Primary minerals: Pentagonite, Heulandite
Matrix: Chalcedony
Crystal systems:
Pentagonite – Orthorhombic
Heulandite – Monoclinic
Chalcedony – Trigonal (cryptocrystalline)
Formation: Secondary mineralization in volcanic cavities with silica-rich fluids
This exceptional association specimen features a vivid teal-blue pentagonite crystal cluster, coated with transparent chalcedony, perched on a softly textured chalcedony matrix, accompanied by translucent heulandite crystals. The pentagonite forms sharp, angular aggregates with excellent color saturation—an immediate focal point against the neutral, granular chalcedony background.
Elongated, bladed heulandite crystals radiate naturally from the matrix, adding dimensional contrast and confirming a multi-stage mineralization process. The overall composition feels unmistakably authentic, A perfect unaltered example of rare zeolite-related mineral formation.
Dimensions: 2.5” x 2” x 1”
Weight: 112g
Pentagonite is sometimes associated with clarity and focused intention, while heulandite is often linked to reflection and inner awareness. Many collectors simply appreciate the calm yet striking color contrast of this natural pairing.
Collector’s Notes
Pentagonite is a rare calcium silicate hydrate, known almost exclusively from select Indian localities, and is seldom encountered with strong color and intact crystal form. Specimens featuring pentagonite, especially when clearly visible under chalcedony overgrowth, in clean association with heulandite are especially desirable due to their limited availability and visual clarity. This piece is ideal for collectors focused on rare species, secondary silicates, and classic Indian associations.
Bright blue-green pentagonite crystal
Associated heulandite on chalcedony
Clear multi-mineral, multi-stage formation
Rare species with strong color expression
Chalcedony over rare Pentagonite
Primary minerals: Pentagonite, Heulandite
Matrix: Chalcedony
Crystal systems:
Pentagonite – Orthorhombic
Heulandite – Monoclinic
Chalcedony – Trigonal (cryptocrystalline)
Formation: Secondary mineralization in volcanic cavities with silica-rich fluids
