The Firefly and Serenity Database

HTX-20 ("Satan's Snowflake") is the scientific name given to the crystalline compound used throughout the 'Verse as a highly specialized explosive; commonly for mining.

The compound is extremely volatile when exposed to liquids and temperatures exceeding 100°C, or when simply jostled.

In 2517, the crew of Serenity were tasked by Badger to deliver crates of HTX-20 to the mining operation on the planet of Aberdeen.