Rare UV Reactive Hackmanite Loose Stones from Afghanistan | Natural, Untreated

Natural Hackmanite Loose Stones — UV Reactive, Untreated, Afghanistan Origin

This listing features a curated parcel of genuine, earth-mined Hackmanite loose stones sourced directly from Afghanistan — one of the few known localities producing gem-quality material. Each stone is 100% natural with no treatment applied.

Hackmanite is a rare sulfur-bearing variety of sodalite known for its tenebrescence — a reversible color-change phenomenon where the stone shifts color upon exposure to UV or sunlight, then gradually returns to its original hue in the dark. The UV fluorescence on these stones is rated Strong, as visible in the UV photo: stones glow in vivid orange-red tones under shortwave UV light.

Stone Details

• Stone Name: Hackmanite (UV Reactive Sodalite variety)
• Origin: Afghanistan
• Classification: Semi-precious stone
• Category: Loose Stones | Faceted Gems
• Carat Weight Range: Under 1 carat to 1.01–3 carats
• Shapes Available: Cushion, Emerald Cut, Princess, Radiant
• Colors: Lavender, Purplish Pink, Blue, Purple, Light Pink
• Clarity: Included (I), Slightly Included (SI), Very Slightly Included (VS)
• Treatment: None — 100% natural, earth-mined
• Fluorescence Under UV: Strong (orange-red glow)
• Condition: Good (G)
• Rarity: Super Rare
• Authenticity: Genuine natural gemstone
• Birthstone: February (alternative birthstone)

What You See in the Photos

The daylight photo shows the parcel laid out on a gem tray — stones display a range of lavender, blue, purple, and purplish-pink tones in natural light. The UV photo shows the same stones under shortwave UV illumination, where they fluoresce in strong orange-yellow to red tones — a direct demonstration of the tenebrescent behavior Hackmanite is known for.

Frequently Asked Questions

Does Hackmanite permanently change color?

No. Hackmanite is tenebrescent — it shifts color when exposed to UV or sunlight, then reverts to its original color in darkness. This cycle is reversible and repeatable.

Is Hackmanite suitable for use in jewelry?

Yes, though it has a Mohs hardness of 5.5–6, making it best suited for pendants, earrings, and brooches rather than rings subject to daily abrasion.

What causes the strong UV fluorescence in Hackmanite?

The fluorescence is caused by sulfur-based color centers (F-centers) within the sodalite crystal structure, which absorb and re-emit UV energy as visible orange-red light.