from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mixture of clay minerals and iron oxides formed by alteration of olivine
from The Century Dictionary and Cyclopedia
- n. A silicate of iron, calcium, and magnesium found in the augite-andesite of Carmelo Bay, California. It is probably an alteration-product of olivin.
Sorry, no etymologies found.
This heating occurred only when the meteorite fell toward Earth, so the iddingsite and whatever it enclosed had to be there prior to the journey.
What he says is the inevitable conclusion: The microbes died and became encased within the iddingsite while on Mars.
Nobody has a foolproof chemical method for telling what microfossils are terrestrial and which are extraterrestrial, so McKay has offered two other defenses of his conclusion: The microfossils in two additional Mars meteorites now being studied are encased in the mineral iddingsite in a way that could have occurred on Mars but not later on Earth.
Even more significant, the iddingsite near the outer zone of the meteorite had been altered by the crust that formed there as the red-hot meteorite sped into the earth’s atmosphere.