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      あなたはこのオークションに入札していません。

      $276.00
      現在の入札額
      14
      入札
      9d 9h 45m 48s
      01/03/2025 01:30 pm

      Rarest stone Hackmanite 7.20 Ct Natural Color Change Hackmanite From Afghan

      14
      2259
      15

      SKU
      寸法(mm)
      15.800 x 9.700 x 7.700mm
      重さ (CT)
      7.200
      Clarity
      SI
      タイプ
      Faceted

      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.


      配送業者 配送先Thailand その他の国への配送
      Standard Shipping - Tracked $8.00 / 7 $15.00 / 21
      :国
      Standard Shipping - Tracked 、 2以上のアイテムを含む注文で$10.00に割引されます
      世界のその他の地域
      Standard Shipping - Tracked 、 2以上のアイテムを含む注文で$20.00に割引されます
      FedEx $35.00 / 2 $35.00 / 4
      :国
      FedEx 、 2以上のアイテムを含む注文で$35.00に割引されます
      世界のその他の地域
      FedEx 、 2以上のアイテムを含む注文で$40.00に割引されます

      natugems
      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
      確認済み
      2252フィードバック

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      発送詳細

      配送:
      $15.00 21日 ( Standard Shipping - Tracked経由)
      発送元:
      Thailand

      支払いオプション

      • paypal

      概要

      リストタイプ : Standard
      製品番号 : 1742749
      推定希望小売価格 : $3,500.00
      入札の開始 : $1
      始まります : 15th February 2025 01:30 pm PST
      終わり : 1st March 2025 01:30 pm PST
      * すべての価格はUSDで表記されています