Lava Bucket

A lava bucket is a bucket filled with lava.

Obtaining
Lava source blocks can be collected and replaced using a bucket, in much the same way as water can.

Usage
A lava bucket can be used as an efficient fuel. It has the longest burning value of 1000 seconds, compared to 800 seconds for a coal block (a lava bucket smelts 100 items, and a coal block smelts 80). After smelting starts, the lava bucket turns into an empty bucket.

Lava buckets can be used to break end portal blocks by placing the lava on the side of a block corresponding to a side of an end portal block.

Trading
Journeyman-level Armorer villagers buy a lava bucket for one emerald as part of their trade.

Journeyman-level Armorer villagers have a 40% chance of offering to buy a lava bucket for 1 emerald.

Cauldrons
In the Bedrock and PlayStation 4 editions, lava bucket can be placed inside cauldrons (empty the bucket) and will hurt entity if the entity stands inside the cauldron, unless the entity is fire immune, though water flow on it or waterlogged it will not emptied or extinguish lava cauldron.

Block data
In Bedrock Edition, buckets use data value to determine contents. Once used, each data value is set to 0 (Empty Bucket). If no data value is provided, data value is 0.