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$201.00
Reserve Not Met
Current Bid
7
Bids
07/12/2024 01:38 pm
7
1790
5

Rarest stone Hackmanite 1.35 Ct Natural Color Change Hackmanite From Afghan

SKU
Dimensions (mm)
8.600 x 6.300 x 5.000mm
Weight (cts)
1.350
Clarity
SI
Type
Faceted
Colours

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.
Bangrak, Thailand
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Bids History (7)

Reserve not met

2 years ago
$200.00
2 years ago
$150.00
2 years ago
$75.00
tony711j
Purchased from this seller previously
2 years ago
$54.00
tony711j
Purchased from this seller previously
2 years ago
$33.00
pietpaal
Purchased from this seller previously
2 years ago
$22.00
pietpaal
Purchased from this seller previously
2 years ago
$11.00

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Shipping Details

Shipping:
$15.00 21 days via Standard Shipping - Tracked
Ships from:
Thailand

Payment Options

  • paypal

Overview

Listing Type : Standard
Product ID : 1742751
Estimated RRP : $800.00
Starting Bid : $1
Starts : 23rd November 2024 01:38 pm PST
Ends : 7th December 2024 01:38 pm PST
* All prices are in USD