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      $321.00
      当前出价
      18
      出价
      7d 5h 8m 55s
      27/02/2025 01:42 pm

      Rarest stone Hackmanite 2.45 Ct Natural Color Change Hackmanite From Afghan

      18
      1788
      17

      存货单位
      尺寸(毫米)
      9.100 x 8.700 x 5.800mm
      重量 (cts)
      2.450
      Clarity
      SI
      类型
      Faceted
      颜色

      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


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      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.
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      送货细节

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      发货自:
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      概述

      列表类型 : Standard
      产品编号 : 1742753
      预计建议零售价 : $2,000.00
      起拍价 : $1
      开始 : 13th February 2025 01:42 pm PST
      结束 : 27th February 2025 01:42 pm PST
      * 所有价格均以:货币为单位