The basic crystal system where three axes of equal length intersect at 90-degree angles is called the Cubic system.

Here's why:

* Equal Axes: All three axes (a, b, and c) are of the same length.

* Right Angles: The axes intersect at 90-degree angles (α = β = γ = 90°).

This combination of equal axes and right angles leads to highly symmetrical crystals with cubic or box-like shapes. Some common examples of minerals that crystallize in the cubic system include:

* Halite (NaCl) - Table salt

* Diamond (C)

* Fluorite (CaF2)

* Pyrite (FeS2)