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An abandoned Kalandan outpost was built on an artificial planet composed primarily of a diburnium-osmium alloy. Attempts to cut through the surface with hand phasers had little effect. (TOS: "That Which Survives")
Kelvans used a material similar to diburnium, though much denser, in security applications. Prison door bars and a Kelvan field projector casing were fashioned from the substance. Spock doubted if phaser fire could disturb its molecular structure. (TOS: "By Any Other Name")