X rays and crystal structure . Quartz isthus referred to three equal axes making equalangles with each other, just as is calcite. Quartz, * See W. H. Bragg, Proc. Roy. Soc, A,
mp-6930: SiO2 (Trigonal, P3_221, 154)
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Cristal de roche (Quartz) minéral, structure cristalline. Onyx, améthyste et agate gemstone sont toutes les variétés de quartz. Montré que les atomes de sphères de couleur (S Photo Stock - Alamy
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