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Substitution of iron and other tri-valent elements for aluminium result in the color variations. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.4. Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue colored quartz containing abundant dumortierite inclusions.
Quartzite can have a grainy, glassy, sandpaper-like surface 'Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. [1] [2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.
Carnelian intaglio with a Ptolemaic queen, Hellenistic artwork, Cabinet des Médailles, BnF Museum, Paris. There is a Neo-Assyrian seal made of carnelian in the Western Asiatic Seals collection of the British Museum that shows Ishtar-Gula as a star goddess. She is holding a ring of royal authority and is seated on a throne.
Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the ...
Doctors explain which blood type is more susceptible to norovirus, also known as the 24-hour flu and stomach bug. Plus, how one gene mutation helps protect from it.
The name 'chalumeau' is used by European organ-builders to denote an eight-foot short-resonator organ stop used for color effects. This was first encountered in the organ of the Frauenkirche at Dresden and was built by celebrated organ builder Gottfried Silbermann between 1732 and 1736. Silbermann was so pleased with the sound of this new ...
The next time you're at a shelter, consider the dogs that need help the most. They need love! Like Ollie, a German Shepherd mix who seems to have "lost all hope" about finding a forever home.
Possible Electoral Vote Counts. When you vote, you don’t elect the president: You tell your state’s electoral-college electors how to vote. In most states, all electors vote with the state’s popular opinion.
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