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Relation between symmetry of a reciprocal vector and lattice planes perpendicular to it

What is the relation the symmetry of a reciprocal vector and lattice planes perpendicular to it? Are the two symmetries equivalent? The meaning of symmetry in reciprocal space is unclear. If you are ...
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is it possible to make crystals of multiple organic compounds that form a homogenous mass under normal conditions

Some chemicals, organic or not, naturally separate when crystallized. For example, mixed dextro- and levo- forms of tartaric acid ("racemic acid") were separated by Louis Pasteur by the ...

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