Arnold Cheong

Omphacite and Jadeite Jade

Jadeite and Omphacite are members of a large group of rock-forming minerals called pyroxenes, where Jadeite’s chemical formula is NaAlSi2O6, and Omphacite’s is (Ca,Na)(Mg,Fe2+,Al)Si2O6. Both minerals have different chemistry and/or structure. A matching colour pair of dark green oval cabochon [SAMPLE A] jade earring were submitted by customer. Spot reading Refractive Index of [SAMPLE A] both

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"B+C-Jade"

A green oval cabochon [Article 1] stone were submitted by customer as a “Type-A” Jadeite Jade. “Type-A” Jadeite Jade in trade is known as a jade with natural colour, and not undergone any treatment or modification through the impregnation with colourless or near colourless wax, resin, or any other agents. We performed a standard gemological testing, and

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“Energy” Stone

A weighted 119.051 cts uneven shaped stone with iridescent on its flat surfaces submitted as rare stone by a customer. Customer told that this stone is from meteorite and come with strong “Cosmic energy”. Random 2 spot were tested on [Specimen 1] with Raman spectroscopy, and result of the Raman spectrum matched closely with the RRUFF spectrum

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Hydrophane Ethiopian Opal

Opal is a hydrated amorphous form of silica (SiO2·nH2O) which its water content may range from 3 to 21% by weight, most of the opal from Wollo, Ethiopia, is hydrophane. The term hydrophane comes from the Greek words meaning “water-loving” and describes their ability to absorb water and change from opaque or semi-translucent to translucent

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