One could make a slight correction for the undercounting of stony meteorites ( e . g ., the percentage of irons would decrease by a 0.2 % ), but this was not done.
22.
The "'Ensisheim meteorite "'is a stony meteorite observed to fall on November 7, 1492 in a wheat field outside the walled town of Ensisheim in then Alsace, Further Austria ( now France ).
23.
If this account is accurate, it would rule out the Black Stone being an agate, a basalt lava or a stony meteorite, though it would be compatible with it being glass or pumice.
24.
For some of the less-studied stony meteorite falls, it is not known whether the object is chondritic; thus the number of meteorites that can be so grouped is 4 % lower than shown above.
25.
In 1795, a large stony meteorite was observed during its fall to Earth at a cottage near a meteor shower over L'Aigle in northern France that had peppered the town with thousands of meteorite fragments.
26.
Animation shows progressive growth over 4550 million years ( Myr ) of the lead isotope ratios for two stony meteorites ( Nuevo Laredo and Forest City ) from initial lead isotope ratios matching those of the Canyon Diablo iron meteorite.
27.
Collisions between ejecta escaping Earth's gravity and asteroids would have left impact heating signatures in stony meteorites; analysis based on assuming the existence of this effect has been used to date the impact event to 4.47 billion years ago, in agreement with the date obtained by other means.
28.
Many of the rocky bodies are apparently made of crude material that is thought to be the same primitive stuff that occasionally falls to Earth in the form of the stony meteorites known as chondrites, which contain lots of primitive silicate rock, as is found widely on Earth.
29.
Stony meteorites are then traditionally divided into two other categories : chondrites ( groups of meteorites that have undergone little change since their parent bodies originally formed and are characterized by the presence of chondrules ), and achondrites ( groups of meteorites that have a complex origin involving asteroidal or planetary differentiation ).
