Recognized as an element by H. Cavendish at London, UK.
Colorless, odorless gas, insoluble in water. Burns in air,
forms explosive mixtures with air. Used for making ammonia, cyclohexane,
methanol, etc. Proposed as a future fuel to replace petroleum. Reactions
between cosmic radiation and gases in the upper atmosphere produce most of
the world's natural tritium (3H) and is not found in any
natural mineral due to the short half-life.
The presence of hydrogen in minerals is detected by using the closed-tube test and
observing the formation of colorless drops of water (H2O) on
the walls of the tube when the sample is heated.
Emsley, J., 1991; THE ELEMENTS : Sec. Ed.,
Clarendon Press, Oxford, 251 p.