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$71.00
Current Bid
1
Bids
Closed
09/11/2023 01:57 am
1
704
3

44Crt Most Rarest Color Change Hackmanite iahh31

SKU
Dimensions (mm)
33.000 x 26.000 x 11.000mm
Weight (cts)
44.000
Treatment
No Treatment
Clarity
SI
Type
Rough, Specimen
Colours

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.

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FedEx $60.00 / 2 days $60.00 / 5 days
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Rest of the world
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DHL $60.00 / 2 days $60.00 / 5 days
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DHL is discounted to $60.00 on orders with 2 or more items
Rest of the world
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Express Shipping $10.00 / 15 days $10.00 / 10 days
Thailand
Express Shipping is discounted to $30.00 on orders with 10 or more items
Rest of the world
Express Shipping is discounted to $30.00 on orders with 10 or more items

iahgems
iahgems
We are best quality natural gemstones company in thailand we sell beautiful natural gemstones high quality and also beads and handicraft our office is in Bangkok Thailand .
Bangrak, Thailand
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  • shawkiddo
    shawkiddo
    Positive

    Such a lovely piece! Unique cut - a great addition to my collection. Swift shipping. A wonderful item at a great price from an excellent seller - thank you!

Bids History (1)
ptussey
Purchased from this seller previously
4 months ago
$70.00

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Shipping Details

Shipping:
$10.00 10 days via Express Shipping
Ships from:
Thailand

Payment Options

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This seller adds 10.00% tax to transactions in Thailand.

Overview

Listing Type : Standard
Product ID : 1767773
Starting Bid : $70
Starts : 3rd November 2023 01:35 am AEST
Ends : 9th November 2023 07:57 pm AEST
* All prices are in USD