AAA Grade Diamond Apophyllite on Blue Chalcedony with Heulandite & Calcite

AAA Grade Diamond Apophyllite on Blue Chalcedony with Heulandite & Calcite

A high-grade multi-mineral specimen featuring sharp, reflective apophyllite crystals over a deep-toned blue chalcedony base, with contrasting heulandite and a well-formed calcite crystal.

This piece captures multiple stages of mineral formation in one — giving it both strong visual impact and real geological depth.

🔍 Key Features

• AAA grade “diamond” apophyllite with high clarity and mirror-like faces

• Deep blue chalcedony matrix creating natural contrast

• Distinct heulandite crystal (brown, wedge-shaped zeolite)

• Visible calcite crystal with blocky form

• Multi-layered crystal growth across the surface

• Strong sparkle, structure, and display presence

📏 Dimensions

• Weight: 122g

• Size: 8.5cm x 4.5cm

🧪 Geological & Scientific Notes

• Apophyllite – KCa₄Si₈O₂₀(F,OH)·8H₂O

Hydrated potassium calcium silicate known for its high lustre and well-defined crystal faces

• Chalcedony – SiO₂

Microcrystalline quartz forming the base layer before later mineral growth

• Heulandite – (Ca,Na)₂–₃Al₃(Al,Si)₂Si₁₃O₃₆·12H₂O

A zeolite mineral forming in low-temperature hydrothermal conditions

• Calcite – CaCO₃

Typically forms later, often appearing as blocky or slightly translucent crystals

👉 This specimen shows a multi-stage formation sequence, commonly seen in volcanic cavities (e.g. Deccan Traps, India)

💎 Why This Piece Stands Out

This is more than a display piece — it’s a natural formation timeline:

Chalcedony forms the base

Apophyllite crystallises over it

Heulandite develops in later conditions

Calcite forms during final mineral phases

👉 That’s what creates the contrast, texture, and layered structure you see here

⚠️ Transparency Note

• 100% natural, untreated

• Minor natural contacts consistent with formation

• Calcite identification based on crystal habit