27.45 CTS PURPLE LABRADORITE POLISHED STONE. CANADA [STS1814]3

Item Information

Dimensions (mm) 27 x 22 x 20mm
Weight (carats) 27.45 carats
No Treatment
LABRADORITE PURPLE
A true purple in this stone is very rare. This stone does have a play of purple with other colours. 
well polished.
The weight and size is app

Labradorite  a feldspar mineral, is an intermediate to calcic member of the plagioclase series.. The streak is white, like most silicates. The refractive index ranges from 1.555 to 1.575. Twinning is common. As with all plagioclase members the crystal system is triclinic and three directions of cleavage are present two of which form nearly right angle prisms. It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites.

The geological type area for labradorite is Paul's Island near the town of Nain in Labrador, Canada. It occurs in large crystal masses in anorthosite and shows an iridescence or play of colors. The iridescence is the result of light refracting within lamellar intergrowths resulting from phase exsolution on cooling in the Boggild miscibility gap.

Gemstone varieties of labradorite exhibiting a high degree of iridescence are called spectrolite; moonstone and sunstone are also commonly used terms, and high-quality samples with good iridescent qualities are desired for jewelry.

 


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Pricing & Details

Bid Increment $1
Starting Bid $1
Auction ID 1141234
Watchers 10 watching
Viewed 217 times
Starts 1st Mar 2020 3:55pm PST
Ends 29th Mar 2020 4:55pm PDT

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