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      You have not bid on this auction.

      $22.00
      Current Bid
      0
      Bids
      Closed
      24/05/2021 01:28 pm

      Sphene pair, 1.9ct, really beautiful stones with an awesome range of colour

      0
      210
      1

      SKU
      Dimensions (mm)
      6.600 x 4.000 x 3.600mm
      Weight (cts)
      1.900
      Clarity
      SI
      Treatment
      No Treatment
      Colours

      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 authoritiesthink 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[11] 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 five days or contact me. Otherwise I need to cancel the deal.

      If there is anything you aren´t 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 understand the others´ needs.

       


      Shipping provider Shipping to Austria Shipping to rest of world
      Standard Shipping - Tracked $12.00 / 3 days $16.00 / 21 days
      Austria
      Standard Shipping - Tracked is discounted to $15.00 on orders with 3 or more items
      Rest of the world
      Standard Shipping - Tracked is discounted to $17.00 on orders with 3 or more items
      FedEx $27.00 / 2 days $46.00 / 5 days
      Austria
      FedEx is discounted to $26.00 on orders with 2 or more items
      Rest of the world
      FedEx is discounted to $45.00 on orders with 2 or more items
      Express Shipping $36.00 / 2 days $75.00 / 5 days
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      Express Shipping is discounted to $40.00 on orders with 3 or more items
      Rest of the world
      Express Shipping is discounted to $65.00 on orders with 3 or more items
      Registered Shipping $9.00 / 7 days $16.00 / 21 days
      Austria
      Registered Shipping is discounted to $15.00 on orders with 3 or more items
      Rest of the world
      Registered Shipping is discounted to $15.00 on orders with 3 or more items
      Standard Shipping - Untracked $5.00 / 3 days $13.00 / 28 days
      Austria
      Standard Shipping - Untracked is discounted to $15.00 on orders with 3 or more items
      Rest of the world
      Standard Shipping - Untracked is discounted to $13.00 on orders with 3 or more items

      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
      Verified
      2899 Feedback

      • golda1
        golda1
        Positive

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

      • marisha
        marisha
        Positive

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

      • graphicequaliser
        graphicequaliser
        Positive

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

      Bids History (0)
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      Audit

      The Gemstone Sheriff program allows our members to request an audit on any product, which is completed by an independent Gemologist who assesses the accuracy of the item description and pictures.

      Shipping Details

      Shipping:
      $16.00 21 days via Standard Shipping - Tracked
      Ships from:
      Austria

      Payment Options

      • paypal
      • stripe
      • escrow
      This seller adds 20.00% tax to transactions in Austria.

      Overview

      Listing Type : Standard
      Product ID : 1466399
      Starting Bid : $22
      Starts : 26th April 2021 01:28 pm PDT
      Ends : 24th May 2021 01:28 pm PDT
      * All prices are in USD