One scientist said it could have been a "random small piece of rock, probably from the asteroid belt".
Mr Wintringham's wife Marion told the inquest the climb was "very straightforward" and the piece of rock looked "safe".
BBC: Ben Wintringham's abseil death in Morocco an 'accident'
"We are just about to take a piece of rock and, maybe, etch it into the first wheel, " Patrick Chung, a partner at venture-capital firm New Enterprise Associates.
It might sound like something straight out of a Harry Potter movie, but a mysterious piece of rock salvaged from a 400-year-old wreck might turn out to be a legendary Viking "Sunstone" -- an ancient solar compass.
ENGADGET: Alt-week 3.9.13: Sunstones, knotted vortices and a zero-g robot
Shelves and coffee tables display trinkets picked up around the world an ivory elephant from India, a piece of volcanic rock from Pantelleria.
They'd balance a spoon-shaped piece of magnetic rock on any flat surface, and since it was magnetic, the handle would swivel to align itself with the Earth's magnetic poles.
Once a piece of space-rock enters our atmosphere, it becomes known as a meteor.
CNN: Meteor shows why it is crucial to keep an eye on the sky
His skin flushed from pale blue to beige to a dappled grey, taking on the tone of every piece of coral and rock he encountered.
The second sample is a piece of dolomite (a rock made of calcium magnesium carbonate).
In 1908 a comparatively tiny piece of space-borne rock, 30-50 metres across, exploded above Tunguska, a remote part of Siberia.
Three isolated concrete arches, the remnants of a piece of Soviet planning, stand eerily against a rock face.
And the final piece of artwork will be a sculpture of lambs on a rock created by Angela Hunter.
As observed in a popular video that de Waal showed in his TED talk, after receiving the first piece of cucumber, the capuchin monkey gives the experimenter a rock as expected.
Many, who saw the 10-piece band in concert, walked away feeling they had just seen the future of rock 'n' roll.
They worked to create an extraordinarily original piece over the course of just a few days, striking a delicate middle ground between rock and jazz.
As I explained in my piece on the Melvan, part of the fervor surrounding the Melvan is due to some curious graffiti of rock group KISS drawn by the late Nirvana frontman Kurt Cobain.
On Sunday we begin with We The Undersigned, aka WtU. They are a Liverpool based collective that play a high energy mix of Reggae, Rock, Funk, Jazz and Hip Hop, topped with a four piece brass section.
We've gone into thorough detail about how pro guitar works on the software side of Rock Band 3, for better and for worse (you can check out that impressions piece here), so for this review we're largely going to focus on how the hardware feels.
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