Just because a rock contains circular or spherical features does not mean that the feature is a chondrule or that the rock is a chondritic meteorite. Many terrestrial rocks contain circular features such as amygdules, rounded pebbles, and fossils. I have seen spherules in cavities in rocks that I suspect are insect eggs. Terrestrial rocks do not contain chondrules.
All the photos below were sent to me by persons who wanted to know if the rock was a meteorite. None of them are meteorites. None has a fusion crust.
Several of the rocks depicted below are amygdaloidal basalts.
Chondritic meteorites contain spherical chondrules. Chondrules are rarely greater than 1 mm in diameter. Here are some meteorites with large chondrules. All of these photos are of sawn faces.
- Erg Chech 003
- Gujba – The round things are iron-nickel metal
- Northwest Africa 10256
- Northwest Africa 13543
- Northwest Africa 801
This is the only meteorite of which I am aware that has large “round things” in it.