AAA Grade Diamond Apophyllite on Blue Chalcedony — High Clarity Cluster with Internal Inclusions

AAA Grade Diamond Apophyllite on Blue Chalcedony — High Clarity Cluster with Internal Inclusions

This AAA grade apophyllite cluster is a high-lustre display specimen, featuring sharply terminated, transparent crystals with a classic “diamond” appearance, naturally set on a soft blue chalcedony base.

The apophyllite crystals show excellent clarity with well-defined geometric terminations and strong vitreous lustre. Several points display internal inclusions and natural veils, along with subtle light reflections that produce occasional rainbow flashes under direct light.

The underlying blue chalcedony provides both structural support and visual contrast, with its smooth, microcrystalline texture and soft translucent tone enhancing the overall composition of the piece.

Dark mineral inclusions are visible within parts of the cluster—likely iron or manganese-based minerals—adding depth and natural variation, and clearly indicating this is a natural, untreated formation.

Key Features

• Material: Apophyllite on Chalcedony

• Chemical Composition:

  - Apophyllite: KCa₄Si₈O₂₀(F,OH)·8H₂O

  - Chalcedony: SiO₂

• Colour: Clear to slightly green-tinted apophyllite with pale blue chalcedony base

• Crystal Habit: Tetragonal prismatic crystals with pyramidal terminations

• Formation: Secondary mineral growth within volcanic cavities

• Transparency: Transparent to translucent

• Lustre: Vitreous (glass-like)

• Feature Highlights:

  - High-clarity “diamond” terminations

  - Internal inclusions + natural veils

  - Subtle rainbow refractions under light

  - Contrasting blue chalcedony matrix

Dimensions

• Size: 4.5 cm x 3.4 cm

• Weight: 28 grams

Geological & Scientific Notes

Apophyllite is a hydrated potassium calcium silicate mineral that commonly forms in basaltic environments, particularly within gas cavities of volcanic rock. As mineral-rich fluids circulate through these voids, apophyllite crystallises into well-defined tetragonal structures.

The “diamond” appearance refers to the sharp, reflective terminations and high clarity of the crystal faces, which maximise light reflection and give a bright, glass-like finish.

The blue chalcedony base is a microcrystalline form of quartz that formed earlier, lining the cavity before apophyllite growth began. This indicates a multi-stage formation process where silica deposition was followed by later mineral crystallisation.

Visible inclusions within the apophyllite are natural and can include trapped mineral particles or fluid inclusions, offering insight into the crystal’s growth environment.

Rainbow flashes occur due to internal fractures or inclusions refracting light, not due to any treatment or enhancement.

Condition

• AAA grade clarity and crystal definition

• Multiple intact terminations

• Natural inclusions and internal features present

• Minor edge contacts consistent with natural growth

• No repairs or artificial enhancements observed

Care Instructions

• Handle with care — apophyllite is relatively fragile (Mohs ~4.5–5)

• Avoid knocks or pressure on crystal points

• Clean gently with a soft brush or dry cloth

• Avoid prolonged water exposure (hydrated mineral)

• Store separately to prevent damage to terminations