Originally Posted by
Complete Arcane
Spellglyph (Su): A spellglyph is an arcane diagram that substitutes for a specific spell's verbal and material components (if any). When a geometer casts a prepared spell in conjunction with a spellglyph scribed for that spell, he can cast the spell as if it were affected by the Silent Spell feat. The spellglyph replaces any material components (other than a focus) normally required by the spell. A geometer chooses at the time of casting whether to use a spellglyph. An expended spellglyph disappears, just like any other material component. Spellglyphs are normally scribed on parchment, much like scrolls. Preparing a spellglyph requires 1 hour and the use of rare inks costing 25 gp per spell level. If the spell normally requires an expensive material component (with a value of more than 1 gp), exotic inks and treatments of equal cost must be used in the preparation of the spellglyph.