File:Erg Chech 002 — 1,857g End Cuts (50866137773).jpg
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[edit]DescriptionErg Chech 002 — 1,857g End Cuts (50866137773).jpg |
Among life-long meteorite hunters, this is the most unusual discovery of late. It is almost entirely made up of crystals, with 60% of them being quartz. We’ve never seen more than trace amounts of quartz before. It must have formed deep in a planetary-sized body with lots of water. The slow cooling deep underground formed crystals upon crystals, some several cm long. The oxygen-isotope line does not match to any other meteorite (i.e., not Mars, moon or Vesta). Isotope dating research is ongoing; I can’t wait to see what they find. Dr. Tony Irving of UW: " Erg Chech 002: A Unique Sodic Achondrite Perhaps From a Destroyed Ancient Planet: “Sodium-rich mafic (Mg-Fe-rich) igneous rocks are rare, even on planet Earth. In May 2020 a very different sort of plutonic igneous achondrite was found in the Erg Chech sand sea located in far southern Algeria near the mutual borders with Mali and Mauritania. This unique unbrecciated achondrite is composed predominantly of a gabbroic lithology (composed mainly of pigeonite and sodic plagioclase), but it is striking because of the sporadic presence of large (up to 9 cm) megacrysts (more accurately xenocrysts) of various sorts of green to yellow-green pyroxene (augite, orthopyroxene, pigeonite), which exhibit embayed shapes and compositionally-different reaction rims against the dominant groundmass. Based on the available data (but with much more to be revealed from further studies) we believe that this achondrite may be derived ultimately from a previously unsampled differentiated, planet-like parent body, possibly one that suffered collisional destruction and dispersion of its crustal rocks early in solar system history. The specimens now under study may have been ejected more recently from remnants of that catastrophic event, which were fortuitously captured into orbit within the main asteroid belt between Mars and Jupiter.” It looks incredible in polarized light, where each crystal orientation can be visualized distinctly. There is even an art site dedicated to this beauty. I am listed in the Met Bull for table&code=72475 Erg Chech 002 |
Date | |
Source | Erg Chech 002 — 1,857g End Cuts |
Author | Steve Jurvetson from Los Altos, USA |
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This image was originally posted to Flickr by jurvetson at https://flickr.com/photos/44124348109@N01/50866137773. It was reviewed on 10 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 May 2021
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Camera manufacturer | Canon |
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Camera model | Canon EOS 5D Mark IV |
Exposure time | 1/20 sec (0.05) |
F-number | f/14 |
ISO speed rating | 1,250 |
Date and time of data generation | 11:56, 24 August 2020 |
Lens focal length | 100 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
File change date and time | 11:56, 24 August 2020 |
Y and C positioning | Centered |
Exposure Program | Aperture priority |
Exif version | 2.3 |
Date and time of digitizing | 11:56, 24 August 2020 |
Meaning of each component |
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APEX shutter speed | 4.375 |
APEX aperture | 7.625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 2.8284271210653 APEX (f/2.67) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
DateTime subseconds | 000 |
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DateTimeDigitized subseconds | 000 |
Supported Flashpix version | 1 |
Color space | sRGB |
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Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Lens used | Canon EF 100mm f/2.8L Macro IS USM |