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In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms or molecules in a crystalline liquid or solid.

1
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It's subliming (aided in this case by decomposition) and re-depositing. Substances that turn directly from solid to vapor (e.g. naphthalene, water ice) are said to sublime, rather than evaporate. The …
answered Jul 11 '17 by DrMoishe Pippik
3
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As @Ivan Neretin states, it depends. For example, potassium sulfate and aluminum sulfate form "alum", with a single crystal structure. Tartaric acid (and its salts) occur in different forms, and eve …
answered Jan 19 '16 by DrMoishe Pippik
2
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First, in evaporation, the solvent is separated into its components, leaving the impurities (solute) behind. Fractional distillation can be used to separate the components of the solvent, though azeot …
answered Sep 6 '16 by DrMoishe Pippik
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First, your question involves inorganic chemistry, not organic, unless you're talking about the unmentioned gelling agent. Second: Impurities serve as a source of nucleation, and stirring increases c …
answered Oct 26 '17 by DrMoishe Pippik
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No, there is no "exact mimic" crystal, but the crystal habit can alter the crystal form. Consider that the environment in the uniform inside of a substance is different from that along its boundaries; …
answered May 3 '15 by DrMoishe Pippik
6
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Apatite is the chemical name for the mineral found in bone and teeth. It is occasionally found in the form of large crystals, such as this: BTW, just as bone is made of the mineral apatite, there a …
answered May 10 '15 by DrMoishe Pippik
3
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Hopper crystals, that is, the "staircase" form, develop when a crystal forms so rapidly that material is used up before the interior finishes. Table salt, $\ce{NaCl}$, also forms nice hopper crystals …
answered Jul 27 '17 by DrMoishe Pippik
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Native silver crystals can be found in cubic, octahedral, or dodecahedral forms. As you mention, silver often is found with gold, copper and other metals, and with gold, tends to hexagonal stacking, r …
answered Sep 9 '18 by DrMoishe Pippik
4
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Good quality quartz crystals for use in resonators can be found in nature, such as in Minas Gerais, Brazil. They can also be produced by crystallization in a hydrothermal process, simulating in the au …
answered Jun 5 '15 by DrMoishe Pippik
2
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Given proper conditions, any element could have multiple allotropes For example, under sufficient pressure, hydrogen has a metallic phase, which may have been observed at Harvard recently. The extrem …
answered Jul 5 '16 by DrMoishe Pippik
6
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As @Ivan Neretin states, the crystal structure determines how much water can be accommodated. For example, $\ce{CuSO4}$, cupric sulfate or copper(II) sulfate, may be found as a mineral with three, fiv …
answered Oct 6 '16 by DrMoishe Pippik
4
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If cooling is rapid enough, then crystals don't have time to form, so the substance may be amorphous or glassy (though there may be some localized structure). For example, there are metallic glasses …
answered Jan 18 '16 by DrMoishe Pippik
2
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To get directional emission from a molecular substance, just make it into a LASER. Actually, the predecessor to the LASER, the first MASER, was based on microwave emission from ammonia. A $\ce{CO2}$ L …
answered Aug 31 '18 by DrMoishe Pippik
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The main influence on resonant frequency of a crystal is mechanical: the mass of the crystal and the restoring force of elasticity cause the crystal to vibrate at a specific frequency when disturbed. …
answered Jan 3 '16 by DrMoishe Pippik