Solarian Crystals
Source Player Core pg. 276
A solarian crystal is a special gemstone grown from the coronal ejections of stars and used to enhance the power of a solarian's attacks. There are two forms of solarian crystals: core crystals and orbital crystals. Core crystals offer the most basic and essential benefits: a weapon potency crystal adds a bonus to the solar weapon's attack rolls, and the striking crystal adds extra weapon damage dice. Orbital crystals grant more varied effects—typically powers that take effect each time the weapon is used.
A solarian can add a solarian crystal to their solar weapon or solar flare by spending an Interact action, and it remains until they remove it with another Interact action. A solarian's solar weapon and solar flare can have one weapon potency and one striking crystal each, plus a number of orbital crystals equal to the value of the weapon potency crystal they're using with their weapon or flare.
Solarian crystal abilities must be activated following the rules for activating items.