67ct Hemimorphite blue untreated organic cabochon 38mm 67ct super rare

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Item Information

Dimensions (mm) 38 x 38 x 6.25mm
Weight (carats) 67 carats
No Treatment

Please note a piece of genuine 55ct Hemimorphite sold at Auction for $5000 plus hammer fee and sales tax.

This is the largest hemimorphite in our collection. We managed to find some of this rare gemstone on our last buying trip and we couldn’t quite believe our luck. Grab it as we won’t get it again!

Hemimorphite is a rare gem quality form of zinc silicate. Hemimorphite is very closely associated with Smithsonite, another rare collector’s gem. For many years, hemimorphite and smithsonite were both classed together another gemstone called calamine because of the similarity. In 1803 it was discovered to be two different minerals by mineralogist, James Smithson (of the Smithsonian Institute). Hemimorphite is a zinc silicate, whilst smithsonite is a zinc carbonate; zinc silicate Hemimorphite is considered to be rarer than Smithsonite. . The name ‘hemimorphite’ originates from the Greek words ‘hemi’ and ‘morph’, which respectively translate as ‘half-shape’. The name refers to its unusual hemimorphic crystal form, which means that the axial ends of crystals are asymmetrical. One end of each crystal is rather blunt, dominated by a pedion (a single face), while the other is pointed and pyramidal. Hemimorphite can be identified by its distinct composition and unique crystal structure. Hemimorphite can be composed of over fifty percent zinc. Gemmologically, it has a refractive index of 1.614 to 1.636 and a density or specific gravity of 3.30 to 3.50. Its hardness is 5 on the Mohs scale. Few deposits of Hemimorphite yield gemstone quality materials. Some of the most significant deposits are from Vieille Montagne, Belgium and Aachen, Germany, Mexico, Russia (Siberia), The Congo, Namibia, Madagascar and the United States, including Pennsylvania, Montana, Colorado and New Mexico. Hemimorphite can occur in various tones of blue, green and colorless. Most gemstones are blue to blue-green, and look similar to chrysocolla or turquoise. The most desirable color is sky to Swiss blue, which is reminiscent of Paraiba tourmaline. Hemimorphite often exhibits bands of blue with white streaks, and it may also be found interspersed by a dark matrix. Gem quality hemimorphite typically ranges from transparent to translucent in clarity. There is no known treatment for this gemstone - it is natural and organic.

Chemical Formula:    Zn4Si2O7(OH)2•H2O - Hydrous basic zinc silicate

Crystal Structure:     Orthorhombic; tabular

Color:

Blue, green, colorless

Hardness:

5 on the Mohs scale

Refractive Index:

1.614 to 1.636

Density:

3.30 to 3.50

Cleavage:

Perfect

Transparency: Transparent to opaque

Double Refraction    +0.022

Luster: Vitreous, adamantine

Fluorescence:  Weak

Closed

35 bids placed so far
$251.00 goodwitch
23rd Oct 2017 10:19am PDT
$250.00 barryvb
23rd Oct 2017 10:19am PDT
$201.00 barryvb
23rd Oct 2017 12:04am PDT
$200.00 goodwitch
23rd Oct 2017 12:04am PDT
$200.00 barryvb
23rd Oct 2017 12:04am PDT
$176.00 goodwitch
23rd Oct 2017 12:04am PDT
$175.00 barryvb
23rd Oct 2017 12:04am PDT
$156.00 goodwitch
23rd Oct 2017 12:03am PDT
$155.00 barryvb
23rd Oct 2017 12:03am PDT
$151.00 goodwitch
22nd Oct 2017 9:11pm PDT
$150.00 barryvb
22nd Oct 2017 9:11pm PDT
$126.00 barryvb
15th Sep 2017 8:19am PDT
$125.00 slovak
15th Sep 2017 8:19am PDT
$101.00 slovak
15th Sep 2017 8:19am PDT
$100.00 barryvb
15th Sep 2017 8:19am PDT
$61.00 slovak
15th Sep 2017 8:18am PDT
$60.00 barryvb
15th Sep 2017 8:17am PDT
$60.00 slovak
15th Sep 2017 8:17am PDT
$53.00 barryvb
15th Sep 2017 8:07am PDT
$52.00 slovak
15th Sep 2017 8:07am PDT
$41.00 slovak
15th Sep 2017 8:07am PDT
$40.00 barryvb
15th Sep 2017 8:07am PDT
$27.00 slovak
15th Sep 2017 8:07am PDT
$26.00 barryvb
15th Sep 2017 8:07am PDT
$25.00 slovak
14th Sep 2017 9:22am PDT
$24.00 jediknight
14th Sep 2017 9:22am PDT
$16.00 jediknight
14th Sep 2017 9:22am PDT
$15.00 slovak
14th Sep 2017 9:22am PDT
$11.00 jediknight
14th Sep 2017 9:21am PDT
$10.00 slovak
14th Sep 2017 9:21am PDT
$8.00 jediknight
14th Sep 2017 9:10am PDT
$7.00 nicoles79
14th Sep 2017 9:10am PDT
$3.00 nicoles79
7th Sep 2017 3:52am PDT
$2.00 karinarn
4th Sep 2017 2:50am PDT
$1.00 pampernickle
3rd Sep 2017 8:41pm PDT
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Pricing & Details

No reserve
Bid Increment $1.00
Starting Bid $1.00
Auction ID 692938
Watchers 14 watching
Viewed 460 times
Starts 3rd Sep 2017 7:00pm PDT
Ends 29th Oct 2017 7:00pm PDT

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