Scientists have found more than 50 small fragments of a meteor that exploded over Russia's Ural Mountains, and preliminary tests are turning up information about its contents.

However, local residents seem more interested in the black market value of the fragments. As they search for their own pieces of the space rock, sales offers already are filling the internet, and police are warning all purchasers to prepare for possible fraud.

The meteor — which injured nearly 1,500 people and caused widespread property damage in Chelyabinsk city on Friday — was the largest recorded meteor to hurtle through Earth's atmosphere in more than a century. Health officials said 46 of the injured remain hospitalized.

A circular hole can be seen in the ice of Chebarkul Lake where a meteor reportedly struck the lake near Chelyabinsk, about 1500 kilometres east of Moscow.A circular hole can be seen in the ice of Chebarkul Lake where a meteor reportedly struck the lake near Chelyabinsk, about 1500 kilometres east of Moscow. (Associated Press)

Viktor Grokhovsky, who led the expedition from Urals Federal University, said Monday that 53 fragments confirmed to have come from space have been plucked from the ice-covered Chebarkul Lake. He said they are less than a centimetre in size, about 10 per cent iron, and belong to the chondrite type, the most common variation of meteorites found on Earth.

Friday's meteor left a six-metre-wide hole in the ice covering the lake. Divers inspecting it have found nothing at the bottom, but Grokhovsky said a fragment as large as 50-60 centimetres could eventually be found there.

Meanwhile, workers in the city remained busy replacing acres of windows shattered by a powerful shockwave caused by the meteor's strike, which NASA said released 500 kilotons of energy, the power equivalent to more than 30 Hiroshima bombs.

The local governor estimated the damage at 1 billion rubles ($33 million Cdn) and said he hopes the federal government will provide at least half that amount.

Meteor, meteoroid, or meteorite?

Small pieces of space debris — usually parts of comets or asteroids — that are on a collision course with the Earth are called meteoroids. When meteoroids enter the Earth's atmosphere and burn up in a flash of light, they are called meteors (or "shooting stars"). If they survive the frictional heating and strike the surface of the Earth, they are called meteorites.

Lidiya Rykhlova, head of the astronomy department at the Moscow-based Institute for Space Research, said experts have drafted a program that envisages building new powerful telescopes, including space-based ones, to warn against potentially dangerous asteroids, comets and other threats. The 10-year program would cost 58 billion rubles ($1.9 billion).

That huge price tag has raised many eyebrows, drawing a sarcastic post from Alexei Navalny, an anti-corruption crusader and opposition leader. "You'd better fix roads in Chelyabinsk. Holes on them cause more damage than 100 meteorites," he said.

Rykhklova, speaking to online Gazeta.ru, dismissed Navalny's sarcasm, saying the Chelyabinsk fireball highlighted the need for quick creation of such an early warning system.