Trees

None of the Calculator trees occur naturally, they can only be made. There are currently four trees, each of a different tier with Diamond being the highest. As of version 1.8.5 the trees start with nothing on their leaves and you must wait for them to grow, once picked they will grow back. In earlier versions none of the drops from trees regrow, their saplings had to be made again and replanted.

Tree harvesting can be automated with Assimilators.

Amethyst

Used with Hunger Modules. Created using a Large Amethyst and any vanilla sapling (Note: Some mod saplings may work) in a Scientific Calculator. Yields hunger points when right clicked with a Hunger Module or if the logs/leaves are placed in a Hunger Processor. Alternate crafting method is Amethyst Leaves and Amethyst Log in a Scientific Calculator.

Tanzanite

Used with Health Modules. Created by using a Large Tanzanite, Atomic Binding, and any vanilla sapling in an Atomic Calculator. Yields health points when right clicked with a Health Module or if the logs/leaves are placed in a Health Processor. Alternate crafting method is Tanzanite Leaves, Atomic Binding, and Tanzanite Log in an Atomic Calculator.

Pear

See the Sickle. Created by using an Amethyst Sapling, End Stone, and Tanzanite Sapling in an Atomic Calculator. Yields Pears or Rotten Pears when right clicked with a Sickle. Rotten Pears can be used as a replacement for Slime Balls in any recipe. There is no alternate crafting method.

Diamond

See the Sickle. Created by using a Pear Sapling, two End Diamonds, and an End Stone in a Flawless Calculator. The sapling must be planted on an End Diamond Block. Yields Flawless Diamonds or Weakened Diamonds when right clicked with a sickle. There is no alternate crafting method.