Labradorite Tower

Labradorite Tower — Feldspar with Blue-Green Labradorescence

This labradorite tower showcases classic feldspar structure with areas of blue-green labradorescence visible across the polished faces.

The body of the piece is composed of labradorite, a calcium-rich plagioclase feldspar. At certain angles under light, the surface displays flashes of colour—most notably blue and green—caused by internal structural layering within the crystal.

The tower cut enhances these optical effects by creating flat reflective faces, allowing light to interact with the internal lamellae (thin layers) responsible for the colour flashes.

The base tone appears grey to dark with subtle internal variation, while the labradorescence shifts depending on viewing angle and lighting conditions, giving the piece a dynamic, changing appearance.

Key Features

• Material: Labradorite (plagioclase feldspar)

• Chemical Composition: (Ca,Na)(Al,Si)₄O₈

• Colour: Grey base with blue-green optical flashes

• Crystal Habit: Triclinic (polished into tower form)

• Formation: Igneous rock crystallisation during slow cooling

• Transparency: Opaque to slightly translucent edges

• Lustre: Vitreous to pearly

• Feature Highlights:

  - Visible blue-green labradorescence

  - Light-reactive colour shifting

  - Polished tower enhancing reflectivity

  - Subtle internal structural layering

Dimensions

• Height: 9 cm

• Width: 2.6 cm

• Weight: 86 grams

Geological & Scientific Notes

Labradorite is a member of the plagioclase feldspar group, forming in igneous rocks as molten material cools and crystallises.

The optical effect known as labradorescence is caused by light interacting with microscopic layers (lamellae) inside the crystal structure. These layers have slightly different compositions, causing light to refract and reflect internally, producing flashes of colour.

The intensity and colour of the flash depend on the thickness and spacing of these internal layers, as well as the viewing angle. This is why labradorite appears to “light up” when moved under light rather than showing constant colour.

The tower cut is particularly effective for labradorite, as flat polished faces maximise the visibility of these optical effects.

Condition

• Smooth polished finish

• Areas of visible labradorescence

• Natural internal structure present

• Minor surface lines and inclusions consistent with feldspar

• No major chips or structural damage observed

Care Instructions

• Handle with care (Mohs ~6–6.5 but can chip on edges)

• Avoid knocks or drops

• Clean with a soft dry cloth

• Avoid harsh chemicals

• Store separately to prevent surface wear