1.7ct green Thai tourmaline 1504093 (Reserve Price Reduced for quick sale

Item Information

Dimensions (mm) 7.4 x 5.5 x 5mm
Weight (carats) 1.7 carats
No Treatment
IF Green Tourmaline sourced from Thailand,   7.4x5.5mm 1.70ct baguette  Tourmaline  Untested for chromium content
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  • General

    Formula (repeating unit)(Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6 (BO3)3(Si,Al,B)6O18(OH,F)4 [1][2]
    Crystal systemTrigonal
    Crystal classDitrigonal pyramidal (3m) H-M symbol: (3m)
    ColorMost commonly black, but can range from colorless to brown, red, orange, yellow, green, blue, violet, pink, or hues in between; can be bi-colored, or even tri-colored; rarely can be neon green or electric blue
    Crystal habitParallel and elongated. Acicular prisms, sometimes radiating. Massive. Scattered grains (in granite).
    FractureUneven, small conchoidal, brittle
    Mohs scale hardness7–7.5
    LusterVitreous, sometimes resinous
    Diaphaneitytranslucent to opaque
    Specific gravity3.06 (+.20 -.06)[1]
    Polish lusterVitreous[1]
    Optical propertiesDouble refractive, uniaxial negative[1]
    Refractive indexnω=1.635–1.675 nε=1.610–1.650
    Birefringence-0.018 to −0.040; typically about .020 but in dark stones it may reach .040[1]
    Pleochroismtypically moderate to strong[1] Red Tourmaline: Definite; dark red, light red Green Tourmaline: Strong; dark green, yellow-green Brown Tourmaline: Definite; dark brown, light brown Blue Tourmaline: Strong; dark blue, light blue
    Ultraviolet fluorescencepink stones—inert to very weak red to violet in long and short wave[1]
    Absorption spectraa strong narrow band at 498 nm, and almost complete absorption of red down to 640nm in blue and green stones; red and pink stones show lines at 458 and 451nm as well as a broad band in the green spectrum[1]

    Tourmaline ( /ˈtʊərməliːn/ TOOR-mə-leen) is a crystalline boron silicate mineral compounded with elements such as aluminum, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors.

    $950.00 USD

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    Pricing & Details

    Auction ID 886083
    Watchers 0 watching
    Viewed 176 times
    Starts 20th Feb 2019 8:25am PST

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