D20:Quarterstaff Weapon

A quarterstaff is a double weapon. You can fight with it as if fighting with two weapons, but if you do, you incur all the normal attack penalties associated with fighting with two weapons, just as if you were using a one-handed weapon and a light weapon. A creature wielding a quarterstaff in one hand can?t use it as a double weapon?only one end of the weapon can be used in any given round.
The quarterstaff is a special monk weapon. This designation gives a monk wielding a quarterstaff special options.

Quarterstaff Material Enhancements

Material	Average	Masterwork1	Hardness	hp	Special
Wood	—	600 gp	5	10	?
Adamantine	?	n/a	n/a	n/a	?
Crystal, Deep	?	1,000 gp	10	30	Psionic
Crystal, Mundane	?	{{{mccost|600 gp}}}	8	25	No rusting, not metal
Darkwood	?	640 gp	5	10	1/2 weight
Iron, Cold	n/a	n/a	n/a	n/a	?
Mithral	?	n/a	n/a	n/a	?
Silver, Alchemical	n/a	n/a	n/a	n/a	?
Masterwork weapons have a +1 enhancement bonus on attack rolls. The SRD gives neither this value nor a means to accurately determine it.

Magical/Psionic Weapon Enhancements

Bonus Value	Additional Cost1	Hardness Increase2	Additional hp2
+1	+Template:formatnum: -- template expr: 40 50 gp	+2	+10
+2	+Template:formatnum: -- template expr: 160 50 gp	+4	+20
+3	+Template:formatnum: -- template expr: 360 50 gp	+6	+30
+4	+Template:formatnum: -- template expr: 640 50 gp	+8	+40
+5	+Template:formatnum: -- template expr: 1000 50 gp	+10	+50
+6	+Template:formatnum: -- template expr: 1440 50 gp3	+12	+60
+7	+Template:formatnum: -- template expr: 1960 50 gp3	+14	+70
+8	+Template:formatnum: -- template expr: 2560 50 gp3	+16	+80
+9	+Template:formatnum: -- template expr: 3240 50 gp3	+18	+90
+10	+Template:formatnum: -- template expr: 4000 50 gp3	+20	+100
+11 or more	+ bonus × bonus × Template:formatnum: -- template expr: 400 50 gp	+ enhancement bonus × 2	+ enhancement bonus × 10
Increase total cost for magical enhancement by 2,000 gp for cold iron weapons. This is the extra cost of enchanting only one head. Calculate the extra cost as if each head were a separate weapon. Unlike the additional cost, the increase the weapon's hardness and hit points are only gained from its enhancement bonus, not its special abilities. If the weapon has a magical bonus greater than +5 or a special ability worth more than +5, the weapon is epic. Multiply magic cost by 10.

• Weapon Qualities
  
• Magic Items: Weapons
  
• Wikipedia: Quarterstaff
  

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System Reference Document -> Equipment (SRD) -> Weapon Descriptions