Crystallizes In System

Connects a rock, mineral or other geological material to the crystal system in which it crystallizes, such as the cubic, tetragonal, orthorhombic, hexagonal, trigonal, monoclinic or triclinic system. The inverse reading, Crystal System Of Material, names the same link from the crystal system toward each material grouped under it. This relation gives the crystal system already recorded as an enum fact on each material a durable entity identity; it does not replace that enum fact, which keeps classifying every material exactly as before.