Special material descriptions exactly the same??

[Spindoc]

Was scrolling through special materials section of d20pfsrd and came across 2 materials who have the exact same description and functionality? Can anyone clarify?

Geranite
Horacalcum
http://www.d20pfsrd.com/equipment---final/special-materials#top

[My Self]

Geranite is 3rd party. Probably the same thing under a different name for copyright reasons.

[Liz Courts]

Duplicate thread, go here.