It had a mark 6 re-entry vehicle with penetration aids. The stated yield was approximately 6 MT. This was the largest warhead in our arsenal to have been fielded in significant numbers. The remaining 52 were retired shortly after this event. For the purpose of comparison a UGM-93 trident was armed with eight mark 4 RV each rated at 100 kT.
Launch weight of the LGM-25c, titan II, was 330,000 lbs. The greater portion of this mass was nitrogen tetroxide and Aerozine. Liquid under pressure the fuel vaporized when the tank was punctured. Mixing it with the atmosphere introduces an oxidizer. This was a large conventional detonation with resultant NASTY fire.
The RV itself was uranium. It was ejected from the silo before it could be set on fire. Yes, it burns, no you do not want to inhale uranium oxides either.
Even so, environmentally the results were milder than a shuttle launch.
Obsolescent then, maybe, yet it remains NASA's bad boy. There have been few significant changes. First, they are produced on a separate assembly line dedicated to civilian usage. The second, improved guidance and avionics. Third, the introduction of side mounted solid fuel boosters.
Hopefully this is more than anyone wanted to know.
Dan