Philosopher's Stone

The Philosopher's Stone is a major part of the Equivalent Exchange mod. It is used in many recipes and has many features that make it one of the most useful items in Tekkit.

Philosopher's Stones are instrumental in the creation of Nova Catalysts, one of the most notable explosive items in Tekkit.

Transforming
Press "V" to charge the Philosopher's Stone, and Shift + V to lower the charge. While holding the Philosopher's Stone, right click grass to change it into sand, cobblestone into stone, and leaves or wood to change it from oak to snow then snow to birch and vice versa. If you have a sutible source of EMC in your inventory (coal seems to work best for this), press "R" while targeting a mob and holding the Stone to transform it into other mobs.

Fuel
Charcoal

Coal

Alchemical Coal

Mobius Fuel

Aeternalis Fuel

Treasures
Iron

Gold

Diamond

Other
Interdiction Torch

Transmutation Tablet

Realtime Transmutation
The Philospher's Stone not only gives the power to change a handful of items into others, but it can also transform the very environment. Right Clicking will transmute certain blocks into others; Shift + Right Click will change blocks as well (They change back to their previous form when clicked again):

This effect costs no EMC. Transmuting large areas at once can incur a cooldown on the effect.

Various keys affect the Philosopher's Stone's effects.

R: Fires a projectile outwards. If it hits a mob, it will transform it into another random mob of that disposition, Peaceful or Aggressive. This effect costs 1 fuel (glowstone dust, redstone dust, etc.) Mobs added by other mods will turn into a slime or sheep randomly regardless of that mobs disposition. Sometimes, there is a bug that even when a mob is hit by this projectile, nothing happens.

C: Opens a Crafting Table. Due to some changes by Mojang, there is a bug making the Philosopher's Stone jump out of your table into your inventory or worse, disappear.

V: Charges the stone for a larger realtime transmutation area (You can reset it by using it in a crafting recipe). Shift-V lowers the charge level.

G: Change the realtime transmutation shape from cube (default 3 dimensional cube), panel (2 dimensional cube, best if you only want to transmute a surface and no blocks behind it), and line (which is a 3x3x? cube, where ? depends on the charge level, best to transmute the walls of a tunnel or similar).

C+X: Opens an enchanting table which allows you to customize the level and specific enchantments for the specific items. Costs no EMC to use this feature (bug?).

Video Tutorials
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