• <rt id="wzsil"></rt>
  • <cite id="wzsil"></cite>

    <tt id="wzsil"><noscript id="wzsil"></noscript></tt>
  • <rt id="wzsil"></rt>

    1. Augelite Value, Price, and Jewelry Information

      Colorless, triangle-cut augelite, 0.41-ct, 6.3 x 5.3 mm, Champion Mine, Mono Co., California. ? The Gem Trader. Used with permission.

      Augelite

      Soft and brittle, rare augelites are difficult to cut and unsuitable for wear. Faceted transparent pieces are only found in very complete gem and mineral collections.

      Augelite Information

      Data Value
      Name Augelite
      Colors Colorless, white, yellowish, pale blue, pale rose, pink, green.
      Crystallography ?Monoclinic. Crystals tabular and thick; prismatic; acicular. Also massive.
      Refractive Index 1.570-1.590
      Luster Vitreous. Pearly on cleavage surfaces.
      Hardness 4.5-5
      Fracture Uneven
      Specific Gravity 2.696-2.75
      Birefringence 0.014-0.020
      Cleavage Perfect 1 direction, good 1 direction
      Dispersion None.
      Luminescence Usually none, but green Peruvian material has shown light yellow fluorescence in SW, inert in LW.
      Luminescence Present Yes
      Luminescence Type Fluorescent, UV-Short
      Transparency Transparent.
      Absorption Spectrum Not diagnostic.
      Formula

      Al2PO4(OH)3

      Pleochroism

      None.

      Optics

      α = 1.574; β = 1.576; γ = 1.588.?White Mountain, California, material: α = 1.570; β = 1.574; γ = 1.590.?Biaxial (+), 2V ~ 50°.

      Optic Sign Biaxial +
      Etymology

      From the Greek word auge for “luster,” due to the mineral’s glassy appearance.

      Occurrence

      Granitic pegmatites and hydrothermal veins.

      Augelite, faceted and rough - California

      Augelite: California (~ 1.5, rough ? inch across). Photo ? Joel E. Arem, PhD, FGA. Used with permission.

      Comments

      Although new gem-quality finds of this phosphate mineral have appeared, augelites remain quite rare. Furthermore, facetable crystals are typically very small and very rarely transparent. With a hardness of 4.5-5, a brittle tenacity, and two planes of perfect and good cleavage, this gem poses some challenges to gem cutters and jewelry enthusiasts alike. Although it can occur in lovely pale greens, yellows, blues, and pinks, as well as colorless, and has a striking vitreous, glass-like luster, augelite has no dispersion or “fire” to catch the eye.

      This rough and cut set features a colorless, sharp augelite crystal on quartz and a colorless, round brilliant-cut augelite. 2.1 x 1.3 x 0.8 cm (crystal), 0.95-ct (gem), Champion Mine, Mono County, California, USA. ? Rob Lavinsky, www.iRocks.com. Used with permission.

      Identifying Characteristics

      Gem-quality light green augelites from a new find in Peru in 2006 have shown light yellow fluorescence under shortwave ultraviolet light. Gems from other sources have shown no fluorescence.

      step-cut augelite - Peru

      Yellowish green, rhomboid step-cut augelite, 1.04 cts, 7.2 x 4.3 mm, Ortega Mine, Ancash Dept., Peru. ? The Gem Trader. Used with permission.

      Synthetics

      Scientists have used synthetic augelites for research purposes. However, there is no known jewelry use for this lab-created material.

      Enhancements

      No known gem treatments or enhancements.

      Sources

      Long the only source for facetable augelites, crystals from the Champion Mine in Mono County, California could reach about one inch in size. This source is now depleted. New facetable material has come from Peru.

      Yukon Territory, Canada and Bolivia produce fine-quality crystal specimens.

      Other notable sources include the following:

      • United States: Palermo Mine, New Hampshire; Keystone, South Dakota (massive, non-gem).
      • Australia; Sweden; Uganda (massive).
      augelite crystals - Bolivia

      Lustrous augelites in a vug. The largest crystal is 1.3 cm in length. Machacamarca Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosi Department, Bolivia. ? Rob Lavinsky, www.iRocks.com. Used with permission.

      Stone Sizes

      Most existing faceted gems from the California material weigh less than one carat. Some weigh up to three carats. This rare mineral very rarely yields larger stones.

      Care

      Clean augelites only with a soft brush, mild detergent, and warm water. Consult our gemstone jewelry cleaning guide for more recommendations.

      Enter your email to access the Ultimate Opal Buying Guide for free!

      FREE

      THANK YOU!

       

      PLEASE CHECK YOUR EMAIL FOR THE E-BOOK

      Follow us on Facebook

      亚洲人日本人jlzzy