Banded Fluorite Tower — Purple & Blue Zoning with Layered Growth Structure

Banded Fluorite Tower — Purple & Blue Zoning with Layered Growth Structure

This fluorite tower displays striking internal colour zoning, combining deep purples with soft blue-green tones in flowing, layered patterns.

The piece is cut and polished into a six-sided tower, enhancing the natural banding within the fluorite. Distinct colour transitions run through the structure, forming curved and angular zones that reflect changes in chemical conditions during crystal growth.

Fluorite is known for its ability to form in highly defined zones of colour due to trace elements and variations in radiation exposure during formation. This specimen shows clear examples of that process, with visible banding that moves through the piece rather than sitting in flat layers.

The polished finish allows light to pass through the semi-translucent body, highlighting internal structures, subtle inclusions, and variations in clarity.

Key Features

• Material: Fluorite

• Chemical Composition: CaF₂ (calcium fluoride)

• Colour: Purple, blue, and green zoning

• Crystal Habit: Originally cubic (polished into tower form)

• Formation: Hydrothermal mineral deposition in veins and cavities

• Transparency: Translucent

• Lustre: Vitreous (glass-like)

• Feature Highlights:

  - Strong natural colour zoning

  - Purple banding with blue-green transitions

  - Layered internal growth structure

  - Polished tower enhancing light transmission

Dimensions

• Height: 8.4 cm

• Width: 2.3 cm

• Weight: 68 grams

Geological & Scientific Notes

Fluorite forms in hydrothermal environments where mineral-rich fluids deposit calcium fluoride into veins and cavities within surrounding rock.

The colour zoning seen in this piece is caused by trace elements and natural irradiation affecting the crystal lattice during growth. Different conditions at different stages result in the layered bands of purple, blue, and green.

Unlike quartz, fluorite has perfect cleavage in multiple directions, which influences how it is cut and polished. The tower shape highlights the internal zoning while maintaining structural stability.

The curved and angled banding patterns reflect changes in growth direction and chemistry over time, making each piece geologically unique.

Condition

• Smooth polished finish

• Clear and well-defined colour zoning

• Minor natural inclusions visible internally

• Small natural imperfections consistent with fluorite structure

• No major chips or damage observed

Care Instructions

• Handle with care — fluorite is relatively soft (Mohs ~4)

• Avoid knocks or drops (perfect cleavage makes it prone to splitting)

• Clean with a soft dry cloth only

• Avoid water soaking and chemicals

• Store separately to prevent scratches