![]() ![]() Ģ512 relations: A Treasure's Trove, Aachen Cathedral, A’erbasayi Formation, Abbas ibn Firnas, Abelsonite, Abiogenesis, Abiogenic petroleum origin, Abiy Ahmed, Aboriginal sites of Victoria, Abtweiler, Acamarachi, Acanthite, Accelerometer, Achaea (ancient region), Acheson process, Achiam, Achomawi, Acicular (crystal habit), Acoustic resonance spectroscopy, Acousto-optic programmable dispersive filter, Adalbert Stifter, Adam Black (Australian politician), Adamite, Adelaide Lead, Victoria, Adelong, New South Wales, Adenanthos obovatus, Admiralty mining district, Admontite, Adsorption Method for Sampling of Dioxins and Furans, Adularescence, Adventures of Captain Marvel, Aegina Treasure, Aeolis quadrangle, Aequorivita sublithincola, Agate, Agnew, Western Australia, Agua Fria, California, Aguas Calientes caldera, Aguilarite, Aguiliri, Aheylite, Air-gap flash, Ait Ourir, Ajax (cleaning product), Ajoite, Alabama, Alabandite, Alag-Erdene, Khövsgöl, Alchemy Boulders, Alexander III Equestrian (Fabergé egg). Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. ![]()
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