1.A homogenous solid formed by a repeating, three-dimensional pattern of atoms, ions, or molecules and having fixed distances between constituent parts.
2.The unit cell of such a pattern.
2.A mineral, especially a transparent form of quartz, having a crystalline structure, often characterized by external planar faces.
A crystal chandelier sparkling in the light and crystal glasses being readied for sparkling wine.
Looking forward to an elegant evening.