1) Cave formations 2) Glass objects 3) Many cave formations 4) Snowflakes 5) Sugar grains 6) Watch parts 7) Watch-face covers 
Formations of small irregular solid material often composed of calcium, uric acid and phosphate. ... (27 Sep 1997) ... 
a clear mineral formation made of flat sides
Most minerals that grow without interruption will form crystals. Crystals are mainly symmetrical solids bound by a flat (or planar) face. The crystal shape is formed according to the internal arrangement of the atoms.
A crystal, as it pertains to gems, is a hard type of mineral that has the atoms arranged in a perfectly ordered pattern that can extend in any direction. Several crystals in a rock is known as crystalline.