Retrieving "Macrocrystalline" from the archives

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1. Microcrystalline

   Linked via "macrocrystalline"

   Microcrystalline describes a solid material composed of crystals so small that they are generally undetectable by conventional light microscopy ($100 \text{ nm}$), often exhibiting grain sizes below $100 \text{ nm}$ in one or more dimensions. Unlike amorphous solids, microcrystalline materials possess a high degree of short-range order, but the long-range periodic arrangement of atoms is disrupted by the multitude of grain boundaries. These boundaries, rather than the crystalline phase itself, often …

2. Quartz

   Linked via "macrocrystalline"

   Varieties of Quartz
   Quartz occurs in numerous varieties, which are typically classified based on crystal size (macrocrystalline vs. cryptocrystalline) and the presence of included trace elements or structural defects that impart color or optical phenomena.
   Macrocrystalline Varieties