Fulgurite

Fulgurites are natural glass tubes or crusts that are formed when lightning strikes the ground. The word fulgurite comes from the Latin word fulgur, which means lightning. The shape of a fulgurite mimics the path of the lightning bolt as it disperses into the ground.
Source

Built-in Fulgurites

Lightning bolt glass comes with 2 fulgurites. One for converting Sand -> Glass and another for converting Red Sand -> Orange Stained Glass. You can find the code here

Custom Fulgurites

Lightning Bolt Glass supports data-driven Fulgurites letting you create your own!

1. Create a folder in the <pack>/data/<namespace> path in your datapack called fulgurite. This is where you will be placing all your fulgurite JSONs.
2. Create a JSON file. This can be called anything as long as it ends with ".json"
3. Using the JSON Schema below create your own fulgurite.
4. Now run /reload in-game for the changes to apply. You can use /summon lightning_bolt ~ ~ ~ to test if it works.

Schema

Name	Type	Description
type	Types	Type of fulgurite to generate
predicate	Block Predicate	The block to test for
block	Block	The block to place

Types

"minecraft:root_system"

If predicate passes create a root system using block with placement_attempts, column_max_height, and radius.

Additional Properties

Name	Type	Default	Description
placement_attempts	Integer	20	The number of times to attempt to place this block.
column_max_height	Integer	100	The max height of the root system.
radius	Integer	3	The radius of the root system.

"minecraft:replace_single_block"

If predicate passes replace a single block where the lightning hit with block. This is the legacy behavior for fulgurites.

Block Predicate

Name	Type	Description
tag	String	A block tag to match.
blocks	List	A list of block ID's to match.
state	Object	A map of each Property-Value that must match
nbt	String	NBT data to match.

Block

Name	Type	Description
Name	String	ID of the block.
Properties	Object	A map of all Property-Value to set.