GEOLOGY

Detailed explanation-1: -The rhombohedral lattice is also known as trigonal, and has no angles equal to 90°, but all sides are of equal length (a = b = c), thus requiring only by one lattice parameter, and all three angles are equal ( = = ).

Detailed explanation-2: -The Isometric System The first and simplest crystal system is the isometric or cubic system. It has three axes, all of which are the same length. The three axes in the isometric system all intersect at 90º to each other.

Detailed explanation-3: -Orthorhombic: Three mutually perpendicular axes of different perpendicular axes of different lengths.

Detailed explanation-4: -In orthorhombic crystal system all angles are 90 degrees but the three edge lengths are not equal.

Detailed explanation-5: -monoclinic system, one of the structural categories to which crystalline solids can be assigned. Crystals in this system are referred to three axes of unequal lengths-say, a, b, and c-of which a is perpendicular to b and c, but b and c are not perpendicular to each other.