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$20.00
Current Bid
7
Bids
Closed
07/10/2024 09:32 am
7
212
7

120.30 Carats Tourmaline Bunch

SKU
Dimensions (mm)
46.770 x 39.650 x 21.100mm
Weight (cts)
120.300
Type
Rough
Colours

CategoryCyclosilicateFormula
(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]IMA symbolTur[3]Crystal systemTrigonalCrystal classDitrigonal pyramidal (3m)
H-M symbol: (3m)Space groupR3m (no. 160)IdentificationColorMost commonly black, but can range from colorless to brown, red, orange, yellow, green, blue, violet, pink, or hues in-between. It can also be bi-colored, or even tri-colored. Rarely, it can be found as neon green or electric blue.Crystal habitParallel and elongated; acicular prisms, sometimes radiating; massive; scattered grains (in granite)CleavageIndistinctFractureUneven, small conchoidalTenacityBrittleMohs scale hardness7.0–7.5LusterVitreous, sometimes resinousStreakWhiteDiaphaneityTranslucent to opaqueSpecific gravity3.06+0.20–0.06[1]Density2.82–3.32Polish lusterVitreous[1]Optical propertiesDouble-refractive, uniaxial negative[1]Refractive indexnω = 1.635–1.675
nε = 1.610–1.650Birefringence−0.018 to −0.040; typically about −0.020 but in dark stones it may reach −0.040[1]Pleochroism

  • Typically moderate to strong[1]

  • Red: definite; dark red, light red

  • Green: strong; dark green, yellow-green

  • Brown: definite; dark brown, light brown

  • Blue: strong; dark blue, light blue

Dispersion0.017[1]UltravioletfluorescencePink stones; inert to very weak red to violet in long and short wave[1]Absorption spectraStrong narrow band at 498 nm, and almost complete absorption of red down to 640 nm in blue and green stones; red and pink stones show lines at 458 and 451 nm, as well as a broad band in the green spectrum[1]

Shipping provider Shipping to Thailand Shipping to rest of world
Standard Shipping - Tracked $18.00 / 15 days $18.00 / 23 days
Thailand
Standard Shipping - Tracked is discounted to $22.00 on orders with 2 or more items
Rest of the world
Standard Shipping - Tracked is discounted to $22.00 on orders with 2 or more items
DHL $28.00 / 8 days $28.00 / 8 days
Thailand
DHL is discounted to $38.00 on orders with 2 or more items
Rest of the world
DHL is discounted to $38.00 on orders with 2 or more items

gemstoneshunter
gemstoneshunter
Bangrak, Thailand
Verified
4716 Feedback

  • jopals
    jopals
    Positive

    Beautiful, happy to have it

  • fireflyz
    fireflyz
    Positive

    Beautiful stone! Thank you!

  • fireflyz
    fireflyz
    Positive

    Beautiful stone! Thank you!

Bids History (7)
jopals
Purchased from this seller previously
1 month ago
$19.00
1 month ago
Automated Bid
$18.00
1 month ago
$12.00
tomh1957
Purchased from this seller previously
1 month ago
Automated Bid
$11.00
tomh1957
Purchased from this seller previously
1 month ago
Automated Bid
$8.00
donamador
Purchased from this seller previously
1 month ago
$7.00
tomh1957
Purchased from this seller previously
1 month ago
$1.00

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Shipping Details

Shipping:
$18.00 23 days via Standard Shipping - Tracked
Ships from:
Thailand

Payment Options

  • paypal

Overview

Listing Type : Standard
Product ID : 2571809
Starting Bid : $1
Starts : 3rd October 2024 09:32 am PDT
Ends : 7th October 2024 09:32 am PDT
* All prices are in USD