Lost Planet:

[beecee]

https://phys.org/news/2018-04-diamond-sky-lost-planet.html

Study: Diamond from the sky may have come from 'lost planet'

April 17, 2018 by Frank Jordans

Fragments of a meteorite that fell to Earth about a decade ago provide compelling evidence of a lost planet that once roamed our solar system, according to a study published Tuesday.

Researchers from Switzerland, France and Germany examined diamonds found inside the Almahata Sitta meteorite and concluded they were most likely formed by a proto-planet at least 4.55 billion years ago.

Read more at: https://phys.org/news/2018-04-diamond-sky-lost-planet.html#jCp

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the paper:

https://www.nature.com/articles/s41467-018-03808-6

A large planetary body inferred from diamond inclusions in a ureilite meteorite:

Abstract

Planetary formation models show that terrestrial planets are formed by the accretion of tens of Moon- to Mars-sized planetary embryos through energetic giant impacts. However, relics of these large proto-planets are yet to be found. Ureilites are one of the main families of achondritic meteorites and their parent body is believed to have been catastrophically disrupted by an impact during the first 10 million years of the solar system. Here we studied a section of the Almahata Sitta ureilite using transmission electron microscopy, where large diamonds were formed at high pressure inside the parent body. We discovered chromite, phosphate, and (Fe,Ni)-sulfide inclusions embedded in diamond. The composition and morphology of the inclusions can only be explained if the formation pressure was higher than 20 GPa. Such pressures suggest that the ureilite parent body was a Mercury- to Mars-sized planetary embryo.

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If this is validated, could this have been the planetary size body hypothesised to have collided with a young still partly molten Earth, resulting in the formation of our Moon? 

[mathematic]

Have such diamonds been found on earth?  If not, the moon formation body probably (if it existed) was something else.

[Airbrush]

On ‎4‎/‎17‎/‎2018 at 1:56 PM, beecee said:

If this is validated, could this have been the planetary size body hypothesised to have collided with a young still partly molten Earth, resulting in the formation of our Moon? 

Yes, it says it was a moon to mars-sized object.