Corundum is definitely hexagonal
Sapphire typically has a hexagonal crystal structure, with aluminum oxide (Al2O3) forming a dense, closely packed arrangement of oxygen and aluminum ions. This crystal structure contributes to sapphire's hardness and durability, making it a popular choice for jewelry and industrial applications.
No, quartz crystals are not cubic. They are hexagonal prisms with a six sided pyramid on the top.
a center faced cubic hexagonal closed pack structure focused in the minds eye is time travel or invention of the tartis.
phase
A corundum is composed of aluminum oxide with traces of impurities, such as iron, titanium, and chromium. It crystalizes in the trigonal system with a hexagonal prism structure. It is one of the hardest minerals, second only to diamond.
face centre cubic crystal has eight atoms in each corner and one atom in the centre of cubic unit cell.while hexagonal close packed structuree has only six atoms in corners but no in the centre of cubic cell
Solid oxygen has a cubic crystalline structure. Solid nitrogen has a hexagonal crystalline structure.
Swaggar
Ice can exist in various crystalline forms, including Ice Ih (hexagonal), Ice II (tetragonal), Ice III (cubic), Ice V (cubic), Ice VI (tetragonal), Ice VII (cubic), and Ice XI (hexagonal). The structure of ice varies depending on pressure and temperature conditions.
Corundum.
Quartz is a crystalline mineral that typically forms in a hexagonal crystal system. Its most common form, known as alpha quartz, exhibits a six-sided prism shape with a hexagonal cross-section. However, quartz can also exhibit other forms and variations, but its fundamental crystal structure is hexagonal.
A hexagonal lattice is a type of lattice structure that has six-fold rotational symmetry and consists of repeating hexagonal units. This lattice has properties such as high packing efficiency and isotropy, meaning that it looks the same in all directions. One key difference between a hexagonal lattice and other types of lattice structures, such as square or cubic lattices, is the arrangement of atoms or particles. In a hexagonal lattice, the units are arranged in a hexagonal pattern, while in other lattices, the units are arranged in square or cubic patterns. This difference in arrangement affects the overall symmetry and properties of the lattice structure.