Download Opal Identification and Value Ebook by Downing, Paul B. (Hardcover)

Title	Opal Identification and Value
Size	1,425 KB
Classification	Opus 96 kHz
Pages	223 Pages
Durations	50 min 56 seconds
Released	2 years 4 months 0 day ago
File Name	opal-identification_F1udi.pdf
	opal-identification_r938D.mp3

Opal Identification and Value

Category: Teen & Young Adult, Biographies & Memoirs, Science Fiction & Fantasy
Author: Tara Sivec
Publisher: The Associated Press, Lisa Phifer
Published: 2019-04-02
Writer: Mike Kim
Language: Korean, Chinese (Simplified), Portuguese
Format: Kindle Edition, Audible Audiobook

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Opal - New World Encyclopedia - Opal is a mineraloid that can form or replace fossils. The resulting fossils, though not of any extra scientific interest, appeal to collectors because of the stones' myriad combinations of beautiful hues. Coloration can range the full spectrum from white to black and almost everything in between.

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Opal Quality Factors | Types of Opal | GIA - Opal Quality Factors. This large Australian light opal cabochon weighs 117.85 carats. Small play-of-color flashes of orange and green predominate in a pinfire pattern, with spots of a more muted

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Opal - Wikipedia - Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals.

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