Gems & Gemology Vol XXV - Spring 1989 p.47 ( ). Rainbow lattice sunstones are known to have these stripes of flashes or speckles. It is a rare occurrence when Sunstone occurs in a Moonstone, let alone with the added presence of the other phenomena seen in this extraordinary gemstone - perfect parallel lines and equilateral triangles which are incredibly rare in nature. Iron oxide inclusions and exsolution lamellae in rainbow lattice sunstone (RLS) from Harts Range, Australia, are examined using optical and electron microscopy and single-crystal X-ray. The magnetite also predominantly forms triangles and even the lattice pattern has triangular terminations. The magnetite that has no alteration remains black with a metallic sheen. The magnetite inclusions in many cases have oxidized or altered through geophysical processes to give the iridescence or rainbow effect across the lattice patterning. Found in one isolated deposit in the Harts Range in Central Australia, the Utnerrengatye mine is the only known source of this precious gemstone.
These blades orientate (north/south) in different levels by a process known as lamellar twinning and also displays “Sagentic twinning”, which forms the lattice pattern. Rainbow Lattice Sunstone is a unique sunstone formed from the combination of irridescent laths and plates of Haematite and Magnetite in Moonstone. This forms as a very thin blades that occur in one plane at different levels (like pages in a book). Magnetite (Fe3O4) Iron Oxide which creates the lattice effect. This effect is called aventurescence, or Sunstone effect, and gives some of the gems their orange glow. Hematite (Fe2O3) - small, yellow to deep orange platelets which can be hexagonal shape and are generally in one plane within the Feldspar. Sold Out From 198.57/mo with View sample plans Guardian Oval Pillar Rainbow Lattice inspired by the highest vibration of your inner light ONE OF A KIND Rainbow Lattice Sunstone approx 2.02 carat (6) 1. With the advancement in technology over the last 3 decades, a recently conducted more in depth analysis has found the black blades and triangle inclusions in Rainbow Lattice to be magnetite.Ī paper with these results will be published soon by authors from the the Gemmological Institute, China University of Geosciences (Wuhan) and it will be published in The Journal of Gemmology by Gem-A. The geometric, iridescent lattice pattern changes as you roll the gem in your hand. Whilst the initial testing of the stones inclusions conducted in 1989 (see ) concluded that the inclusions were made up of ilmenite (for the black blades and triangles) and hematite (for the orange platelets). The inclusions (internal features) are referred to as: the result of crystalographically oriented exsolution crystals within the feldspar mass. Rainbow lattice sunstone, also known as rainbow lattice, is a type of orthoclase feldspar that exhibits a rare combination of aventurescence, adularescence, and a distinctive iridescence lattice pattern.
It is a type of feldspar which is predominantly Moonstone that is made up of 75% orthoclase and 25% albite. Rainbow Lattice is a very rare and unusual stone.
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