NASA has shared a stunning image of a field of finely-marked turquoise sand dunes smeared across the floor of a Martian crater.

The eye-catching snap, captured by the Mars Reconnaissance Orbiter, shows an accumulation of ‘barchan’ (or crescent-shaped) sand dunes on the Lyot Crater –a large crater in the Vastitas Borealis region of the Red Planet.

Just to the south of the group of barchan dunes lies a large dune with a stranger and more complex structure, depicted in a striking blue shade in the enhanced color image. According to NASA, this formation is made of finer material and may have “a different composition than the surrounding” dunes.

The blue patch appears marked and dimpled in more refined ridges than the wider area nearby.

Once in a blue dune…On the floor of the Lyot Crater on Mars lies a field of dunes. One particular dune, seen in this January view, appears turquoise blue in enhanced color & is made of a different composition than the surrounding dune field. Take a look: https://t.co/zeVqWJHO1ipic.twitter.com/PlMNFI4VQr — NASA (@NASA) June 21, 2018

Mars is currently under the grip of a massive dust storm that has turned the landscape blood red. The colossal storm has now encircled the entire planet.

Red alert.The dust storm on #Mars now encircles the planet. See the change in light on the surface through @MarsCuriosity’s eyes: https://t.co/MNn1xpneNVpic.twitter.com/NZpBlDfpA9 — NASA JPL (@NASAJPL) June 20, 2018

READ MORE: Lost Opportunity?: NASA rover threatened by intense Martian dust storm

Earlier this month, NASA’s Opportunity rover was knocked offline due to lack of solar power as a result of the massive storm. The Curiosity Rover is still functioning on the opposite side of the planet but is facing deteriorating visibility.

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