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Learn about opal, the October birthstone that displays all the colors of the rainbow. Find out how opal forms, interacts with light, and is valued for its play-of-color, pattern, and quality factors.
- Overview
GIA Education. Elevate your career in gems and jewelry by...
- Buyer's Guide
Opal is the product of seasonal rains that drenched dry...
- Research
Opal’s shifting play of kaleidoscopic colors is unlike any...
- Photos & Videos
Opal’s shifting play of kaleidoscopic colors is unlike any...
- Opal Quality Factors
Opal has relatively low density compared to many other...
- Opal History and Lore
Even today, opal invokes a feeling of magic and mystery. -...
- Overview
Learn about the different types of opal, their physical properties, and how they display play-of-color. See pictures of opal in various colors and forms, from black to pink, from common to precious. Find out how to care for opal as a gemstone and where to buy it.
20 de dic. de 2023 · OPAL ist die Lernplattform der TU Dresden und anderen sächsischen Hochschulen, die zeit- und ortsunabhängiges Lernen und Arbeiten für Studierende und Lehrende ermöglicht. Um OPAL zu nutzen, benötigen Sie ein gültiges Login des Rechenzentrums (ZIH) und ein ZIH-Login oder ein ZIH-Gästebuch.
Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals.
OPAL, die Lernplattform zum Lehren und Lernen für Lehrkräfte und Studierende der sächsischen Universitäten, Hochschulen und Berufsakademien.
OPAL es la Oficina Presupuesto de la Asamblea Legislativa, encargada de analizar el efecto económico de las medidas ante la consideración de los legisladores. En su portal, ofrece informes, herramientas y datos sobre el presupuesto, las finanzas, los impuestos y la economía de la Isla.
OPAL es una empresa francesa que diseña y distribuye gafas para niños y adolescentes, especialmente monturas. También ofrece servicios y licencias para el segmento adulto y el deportivo.