Hackmanite Cabochon – Description

A hackmanite cabochon is a polished, domed gemstone crafted from hackmanite, a rare sulfur-rich variety of sodalite. What makes it extraordinary is its tenebrescence—also known as reversible photochromism. This means the stone can change color when exposed to ultraviolet (UV) light, then gradually return to its original hue in natural or indoor lighting.

Appearance

• Base Color: Typically soft violet, lilac, pale pink, light gray, or creamy white.

• UV Reaction: Can transform to deeper purple, pink, or magenta under UV light or sunlight.

• Finish: Smooth, domed top with a flat or slightly curved back, ideal for bezel settings.

• Clarity: Often opaque to translucent, with a waxy to vitreous luster.

Notable Features

• Tenebrescence: The defining trait—color shifts that can be repeated many times.

• Fluorescence: Glows bright orange or pink under UV light in many specimens.

• Hardness: Around 5.5–6 on the Mohs scale, suitable for pendants, earrings, or protected rings.

Origins

Common sources include:

• Afghanistan

• Myanmar (Burma)

• Canada (notably Quebec)

• Greenland

• Tanzania

Uses

• Jewelry cabochons (pendants, rings, earrings)

• Collector’s gemstones

• Metaphysical or healing purposes (linked to intuition and transformation)

Care Tips

• Avoid prolonged heat or harsh chemicals.

• Store away from direct sunlight to maintain color integrity.

• Clean gently with mild soap and water.