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A chondrule (from Ancient Greek χόνδρος chondros, grain) is a round grain found in a chondrite. Chondrules form as molten or partially molten droplets in space before being accreted to their parent asteroids .
Ordinary chondrites are by far the most common type of meteorite to fall to Earth: about 80% of all meteorites and over 90% of chondrites are ordinary chondrites. [11] They contain abundant chondrules, sparse matrix (10–15% of the rock), few refractory inclusions, and variable amounts of Fe–Ni metal and troilite (FeS). Their chondrules are ...
The chondrule size is only about 0.15 mm on average. They are all of petrologic type 3. Famous CO chondrite falls: Ornans; ... Origins of earth and life. Bletchley ...
It has a sculpted and dimpled outer surface due to the melting it experienced while plunging through Earth’s atmosphere, and its interior, consisting of dense forms of iron and nickel, is speckled with chondrules. [2] It was discovered in May 2015 by Australian prospector, David Hole, while searching for gold [3] using a metal detector.
This reveals a dark matrix embedded throughout with mm-sized, lighter-colored chondrules, tiny stony spherules found only in meteorites and not in earth rock (thus it is a chondritic meteorite). Also seen are white inclusions, up to several cm in size, ranging in shape from spherical to highly irregular or "amoeboidal."
Dusty matrix material is uncommon and refractory inclusions are very rare. Chemically, enstatite chondrites are very low in refractory lithophile elements. Their oxygen isotopic compositions are intermediate between ordinary and carbonaceous chondrites, and are similar to rocks found on the Earth and Moon.
The Sutter's Mill meteorite is a carbonaceous chondrite which entered the Earth's atmosphere and broke up at about 07:51 Pacific Time on April 22, 2012, with fragments landing in the United States. [ 6 ] [ 7 ] The name comes from Sutter's Mill , a California Gold Rush site, near which some pieces were recovered.
Primitive achondrites are a subdivision of meteorites.They are classified on the same rank (historically called "Class") and lying between chondrites and achondrites.They are called primitive because they are achondrites that have retained much of their original chondritic properties.