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      $276.00
      Enchère actuelle
      14
      Enchères
      9d 9h 48m 28s
      01/03/2025 01:30 pm

      Rarest stone Hackmanite 7.20 Ct Natural Color Change Hackmanite From Afghan

      14
      2257
      15

      UGS
      Dimensions (mm)
      15.800 x 9.700 x 7.700mm
      Poids (cts)
      7.200
      Clarity
      SI
      Taper
      Faceted
      Couleurs

      About Hackmanite - History and Introduction

      Hackmanite is an exceptionally rare sulfur-rich variety of sodalite which exhibits tenebrescence (the ability of minerals to change color when exposed to sunlight). It was first discovered in Greenland in 1896 by L. C. Boergstroem, and was later named after Victor Axel Hackman (1866-1941), a Finnish geologist. However, it wasn't until recently (1991) that the first gem-quality hackmanite deposit was discovered in Quebec, Canada.

      Hackmanite appears pale to deep violet when first mined, but once exposed to sunlight, the color quickly fades to grayish or greenish-white. When placed back into a dark place or when exposed to short wave ultraviolet light, the violet color slowly returns. The change in color can be seen within seconds of being exposed to sunlight, but the return of the original color can sometimes take up to a week. The tenebrescence effect can be repeated indefinitely, but is detroyed by heating.

      The tenebrescence effect seen in hackmanite is the rarest of all gemstone optical phenomena. It is often confused with the 'color change' phenomenon, where materials can shift color under different types of light sources. Another term for tenebrescence is 'reversible photochromism'. A common example of reversible photochromism can be seen in everyday color-change eyeglass lenses. Color-change eyeglasses darken when exposed to sunlight and lighten up again when they are brought indoors. The effect is caused by a photochemical reaction to UV radiation and is known to occur in only a few rare materials.


      Fournisseur d'expédition Expédition vers Thailand Expédition dans le reste du monde
      Standard Shipping - Tracked $8.00 / 7 $15.00 / 21
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      Standard Shipping - Tracked bénéficie d'une remise de $10.00 sur les commandes contenant 2 ou plus d'articles
      Reste du monde
      Standard Shipping - Tracked bénéficie d'une remise de $20.00 sur les commandes contenant 2 ou plus d'articles
      FedEx $35.00 / 2 $35.00 / 4
      Thailand
      FedEx bénéficie d'une remise de $35.00 sur les commandes contenant 2 ou plus d'articles
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      FedEx bénéficie d'une remise de $40.00 sur les commandes contenant 2 ou plus d'articles

      natugems
      We deal in all kind of gemstones (Precious & Semi Precious) and also Rare gemstones.Collection Pieces, Fancy and different Cutting Exceptional Pieces are Available Here . All our stones are natural and top quality. NOTE ! Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.
      Bangrak , Thailand
      Vérifié
      2252

      Historique des enchères (14)

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      Audit

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      Les détails d'expédition

      Expédition:
      $15.00 21 les jours via Standard Shipping - Tracked
      Expédié depuis:
      Thailand

      Options de paiement

      • paypal

      Aperçu

      Type d'inscription : Standard
      Identifiant du produit : 1742749
      RRP estimé : $3,500.00
      Enchère de départ : $1
      Départs : 15th February 2025 01:30 pm PST
      Prend fin : 1st March 2025 01:30 pm PST
      * Tous les prix sont en USD