<strike id="r3vnr"><pre id="r3vnr"></pre></strike>

<nav id="r3vnr"></nav>
<nav id="r3vnr"><listing id="r3vnr"></listing></nav>
    <form id="r3vnr"></form>

    1. <form id="r3vnr"></form>
        1. <nobr id="r3vnr"><legend id="r3vnr"></legend></nobr>
        2. <wbr id="r3vnr"><th id="r3vnr"></th></wbr>

          Sunstone Value, Price, and Jewelry Information

          Sunstone, Variety of Oligoclase from India By Ra'ike (Own work) [GFDL or CC-BY-SA-3.0], via Wikimedia Commons

          Sunstone

          Sunstone Value

          The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

          Sunstone Value via Gem Price Guide

          Accompanying value information:
          Not found
          Red, Green & Bicolored .10 to .99 carats 1 to 100 carats
          SI to clean to ,500/ct to ,000/ct
          Peach .5 to 20 carats
          SI to clean to /ct.
          Schiller 1 carat plus
          SI to clean to /ct
          Yellow 1 carat plus
          SI to clean to /ct
          Cabochons All sizes
          Red to /ct
          Schiller to /ct

          Sunstone Information

          Data Value
          Name Sunstone
          Is a Variety of Feldspar
          Crystallography Triclinic.
          Refractive Index 1.537-1.550
          Colors Red, green, yellow, and peach body colors.
          Hardness 6-6.5
          Wearability Poor
          Fracture Conchoidal, uneven, splintery
          Birefringence 0.007-0.011
          Cleavage Perfect two directions
          Absorption Spectrum Not diagnostic.
          Identifying Characteristics reddish or golden platelets with metallic luster
          Pleochroism None.
          Optics Biaxial (-). 2V?= 82°.
          Optic Sign Biaxial -
          Luster Vitreous.
          Specific Gravity 2.62-2.67
          Transparency Transparent.
          Phenomena Aventurescence, schiller.

          Comments

          This material contains hematite or goethite inclusions, which reflect light in parallel orientation and create a sparkling sheen in gold to brown color shades. Sunstone may be oligoclase or labradorite in composition and is much admired as a cabochon material among hobbyists. (Labradorite with aventurescence caused by copper inclusions is known as Oregon sunstone and is described in a separate gem listing). Very fine material is not abundant and is hard to obtain.

          Occurrence

          • New Mexico; New York; North Carolina: Maine; Pennsylvania; Virginia.
          • Lake Baikal, USSR; Bancroft area, Ontario, Canada.
          • Tvedestrand and Hitter?, Norway; as masses in quartz veins.
          • Lake Huron (Canada side): brownish to pink color.
          • Kangayam, India.
          • Harts Range, N. T. Australia: an untwinned microcline microperthite with aventurine-type reflections due to inclusions of thin, brownish-red hexagonal inclusions, in two sets at 90° angles. Properties are: a= 1.520; β= 1.525; γ= 1.527; birefringence = 0.007; S.G. = 2.57; hardness = 6-6.5; no UV fluorescence.

          Stone Sizes

          Cabochons from Norwegian and Indian material may reach 100 carats or more. Most available material cuts smaller stones, however. This is because the rough is usually badly shattered and cracked.

          Ready to learn how to identify gems on your own?

          Join our mailing list below to download a FREE gem ID checklist tutorial. See what’s inside…

          • Discover the 17 practical steps to gemstone identification (even if you’re just getting started with gemology)

          • Learn how you can use specific tools to gather data, make observations & arrive at an accurate ID

          • Explore a range of gemological tests… not only will you get familiar with the process but also time-saving shortcuts!

          182ty午夜免费