Sulfur


 * "A sulfuric solid formed when Boomgrock blood is exposed to air."

Sulfur is an ore that is only dropped by the Boomgrock in Dillon's Rolling Western: The Last Ranger. These items look like a  chuncky yellow powder  substance that were within the grocks body. Though it is dangerous to battle Boomgrocks, it isn't worth as much.

Trivia

 * Sulfur is the 16th element in the periodic table (with the symbol S); A crystalline non-metal with the same appearence, a chuncky yellow powder.
 * Giving that Sulfur was the blood of the Boomgrock means that inside the grock is a temperature of 444.6 °C, where sulfur is at its liquid state.