A hexagonal system has a 6th axis of symmetry or a 6th axis of reversal, which is the C axis of the crystal's upright crystal axis. The other three horizontal crystal axes are at an angle of 1200 to each other. The shaft angle α = β = 900, γ = 1,200, and the axis unit a = b ≠c. Representative minerals: emerald emerald, chrome-plated emerald beryl.
The ochre night pearl is elliptical and opaque. The sphere has small pits left behind after natural burning. It is uneven and is the standard trace of collision with stones or gravel when it falls from the sky to the earth. Meteorite Diamond Night Pearl Stone is fine and crystal clear. The beads are crystal clear, dazzling and hard.
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