CAPE CANAVERAL, Florida (Reuters) - NASA's Mars rover Curiosity, dispatched to learn if the planet ever had ingredients for life, drilled its first bit of powder from inside a potentially water-formed ancient rock, scientists said on Wednesday.

The robotic geology station, which landed inside a giant impact basin on August 6 for a two-year mission, transferred about a tablespoon of rock powder from its drill into a scoop, pictures relayed by the rover Wednesday showed.

"We're all very happy to get this confirmation and relieved that the drilling was a complete success," Curiosity engineer Scott McCloskey of NASA's Jet Propulsion Laboratory in Pasadena, California, told reporters on a conference call.

On February 8, the rover used its powerful drill, the first instrument of its type to be sent to Mars, to bore inside a flat, veined piece of bedrock, which appears to contain minerals formed by flowing water.

The sample, retrieved from at least 2 inches beneath the surface of the rock, will be sieved and portions of it processed inside two onboard science instruments.

The gray powder is strikingly different than the ubiquitous red dust that covers the planet's surface, a result of oxidation from solar ultraviolet radiation.

"Having a rock-drilling capability on a rover is a significant advancement," said Louise Jandura, chief engineer for Curiosity's sample system.

"It allows us to go beyond the surface layer of the rock, unlocking a kind of time capsule of evidence about the state of Mars going back 3 or 4 billion years," Jandura told reporters.

The drill is the last of Curiosity's 10 science instruments to be tested since the rover landed inside Gale Crater, located near the planet's equator.

The site was selected because of a three-mile (5-km) high mound of what appears to be layered sediments rising from the crater's floor.

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NASA Mars rover ready to eat, analyze rock powder