SHOP 160,000+ BUY IT NOW GEMSTONES
OR TRY OUR AUCTIONS WITH NO BUYERS FEES
100% NATURAL GEMS & VERIFIED SELLERS
Video Player is loading.
Current Time 0:00
Duration -:-
Loaded: 0%
Stream Type LIVE
Remaining Time -:-
 
1x
    • Chapters
    • descriptions off, selected
    • captions off, selected
      b382131f-fb80-4028-8384-cc9eaa02e7fc.jpg
      31d6b217-7ca7-4052-8374-7655643286bf.jpg
      $99.00 USD
      Prijs

      Sphene, 2.2ct, are you Anke to make a ring with it?

      842
      1

      SKU
      SA2
      Afmetingen (mm)
      7.700 x 7.600 x 4.300mm
      Gewicht (cts)
      2.200
      Treatment
      No Treatment
      Shape
      Round
      Type
      Faceted
      Clarity
      VS
      Kleuren

      Titanite, or sphene (from the Greek sphenos (σφηνώ), meaning wedge), is a calcium titanium nesosilicate mineral, CaTiSiO5. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium.

      The International Mineralogical Association Commission on New Minerals and Mineral Names (CNMMN) adopted the name titanite and "discredited" the name sphene as of 1982, although commonly papers and books initially identify the mineral using both names. Sphene was the most commonly used name until the IMA decision, although both were well known. Some authorities think it is less confusing as the word is used to describe any chemical or crystal with oxidized titanium such as the rare earth titanate pyrochlores series and many of the minerals with the perovskite structure. The name sphene continues to be publishable in peer-reviewed scientific literature, e.g. a paper by Hayden et al. was published in early 2008 in the journal Contributions to Mineralogy and Petrology. Sphene persists as the informal name for titanite gemstones.

      Titanite, which is named for its titanium content, occurs as translucent to transparent, reddish brown, gray, yellow, green, or red monoclinic crystals. These crystals are typically sphenoid in habit and are often twinned. Possessing a subadamantine tending to slightly resinous luster, titanite has a hardness of 5.5 and a weak cleavage. Its specific gravity varies between 3.52 and 3.54. Titanite's refractive index is 1.885–1.990 to 1.915–2.050 with a strong birefringence of 0.105 to 0.135 (biaxial positive); under the microscope this leads to a distinctive high relief which combined with the common yellow-brown colour and lozenge-shape cross-section makes the mineral easy to identify. Transparent specimens are noted for their strong trichroism, the three colours presented being dependent on body colour. Owing to the quenching effect of iron, sphene exhibits no fluorescence under ultraviolet light. Some titanite has been found to be metamict, in consequence of structural damage due to radioactive decomposition of the often significant thorium content. When viewed in thin section with a petrographic microscope, pleochroic halos can be observed in minerals surrounding a titanite crystal.

      Titanite occurs as a common accessory mineral in intermediate and felsic igneous rocks and associated pegmatites. It also occurs in metamorphic rocks such as gneiss and schists and skarns. Source localities include: Pakistan; Italy; Russia; China; Brazil; Tujetsch, St. Gothard, Switzerland; Madagascar; Tyrol, Austria; Renfrew County, Ontario, Canada; Sanford, Maine, Gouverneur, Diana, Rossie, Fine, Pitcairn, Brewster, New York and California in the US.

      Titanite is a source of titanium dioxide, TiO2, used in pigments.

      As a gemstone, titanite is usually some shade of chartreuse, but can be brown or black. Hue depends on Fe content, with low Fe content causing green and yellow colours, and high Fe content causing brown or black hues. Zoning is typical in titanite. It is prized for its exceptional dispersive power (0.051, B to G interval) which exceeds that of diamond. Jewelry use of titanite is limited, both because the stone is uncommon in gem quality and is relatively soft.

      Titanite can also be used as a U-Pb geochronometer, specifically in metamorphic terranes.


      Shipping: For special requests such as express delivery please contact me. For lost stones the seller is not liable, therefore an additional insurance is recommended. Right of return within two weeks after receiving the shipment. Payment via PayPal, Credit Card, or Bank transfer is possible. For the shipping I generally use: Austrian Post or FedEx. Unfortunately from Austria only DHL "express" is possible.

      Please pay your stones in between 48 hours or contact me. Otherwise I need to cancel the deal.

      If there is anything you shouldn't be satisfied with please just let me now and we will find a way to solve every problem. My aim is to make you happy with beautiful stones of good quality, good communication is the easiest way to find a solution!



      Verzend provider Verzending naar Austria Verzending naar de rest van de wereld
      Standard Shipping - Tracked $12.00 / 3 $16.00 / 21
      Austria
      Standard Shipping - Tracked krijgt korting op $15.00 bij bestellingen met 3 of meer artikelen
      Rest van de wereld
      Standard Shipping - Tracked krijgt korting op $17.00 bij bestellingen met 3 of meer artikelen
      FedEx $27.00 / 2 $46.00 / 5
      Austria
      FedEx krijgt korting op $26.00 bij bestellingen met 2 of meer artikelen
      Rest van de wereld
      FedEx krijgt korting op $45.00 bij bestellingen met 2 of meer artikelen
      Express Shipping $36.00 / 2 $75.00 / 5
      Austria
      Express Shipping krijgt korting op $40.00 bij bestellingen met 3 of meer artikelen
      Rest van de wereld
      Express Shipping krijgt korting op $65.00 bij bestellingen met 3 of meer artikelen
      Registered Shipping $9.00 / 7 $16.00 / 21
      Austria
      Registered Shipping krijgt korting op $15.00 bij bestellingen met 3 of meer artikelen
      Rest van de wereld
      Registered Shipping krijgt korting op $15.00 bij bestellingen met 3 of meer artikelen
      Standard Shipping - Untracked $5.00 / 3 $13.00 / 28
      Austria
      Standard Shipping - Untracked krijgt korting op $15.00 bij bestellingen met 3 of meer artikelen
      Rest van de wereld
      Standard Shipping - Untracked krijgt korting op $13.00 bij bestellingen met 3 of meer artikelen

      stonehengejpd
      stonehengejpd
      Selling all kind of gems, great quality at affordable prices, based in the heart of Europe! In case you may have special wishes just let me know :-) If you shouldn´t be satisfied with an order please do not give a negative feedback just let me know and there is always a way to find a solution that everybody is happy!
      Graz , Austria
      Geverifieerd
      2899 feedback

      • golda1
        golda1
        Positief

        Great Seller, AAAAAAAAAAAAAAAAAAA+++++++++++++

      • marisha
        marisha
        Positief

        Beautiful stone! Excellent seller, will buy from here again.

      • graphicequaliser
        graphicequaliser
        Positief

        An exquisite gem and very clean. It arrived promptly too. Thank you.

      Audit

      Met het Gemstone Sheriff -programma kunnen onze leden een audit voor elk product aanvragen. Deze audit wordt uitgevoerd door een onafhankelijke Gemologist die de nauwkeurigheid van de artikelbeschrijving en afbeeldingen beoordeelt.

      Verzendgegevens

      Verzenden:
      $16.00 21 dagen via Standard Shipping - Tracked
      Schepen van:
      Austria

      Betalingsmogelijkheden

      • paypal
      • stripe
      • escrow
      Deze verkoper voegt 20.00% belasting toe aan transacties in Austria .

      Overzicht

      Vermeldingstype : Standard
      Product-ID : 2394922
      Begint : 4th February 2025 02:34 pm PST
      * Alle prijzen zijn in USD