Gelignite
From Tardis Wiki, the free Doctor Who reference
Gelignite is an explosive material invented by Alfred Nobel in 1875. More stable than his earlier creation dynamite, gelignite is easily mouldable and safer to handle.
Ernie Clements kept a store of gelignite which he used for fishing. It had started to "sweat", or exude nitroglycerine, making it extremely unstable. The Doctor used a box of this explosive to destroy the Osirian war rocket being created by Sutekh's servitors. Sarah was able to detonate the box by shooting it with a rifle. (DW: Pyramids of Mars)
In the real world, gelignite is much more stable than dynamite. It doesn't sweat and can't be exploded without a detonator, so it is possible that Clements really used dynamite.
