Gravity Affected Redstone Block

This idea is to add three new blocks to the game.

They are Redstone Gravel, Redstone Sand, and Redstone Red Send.

Redstone Gravel is crafted from Four Gravel and Five Redstone blocks in a checkerboard pattern, and four or five are produced per recipe.

As a block, Redstone Gravel is always active and cannot be turned off, and powers adjacent redstone components in exactly the same way as a Redstone Block would.

Unlike a Redstone Block,  Redstone Gravel Blocks are gravity-affected.  If the block below it is removed, it changes from a block to a Falling Block Entity, and falls until it lands on the next available block, at which point the Falling Block Entity changes itself into a Block.

Redstone Sand and Redstone Red Sand are crafted similarly and function identically, with the only difference being that they look different.