iddingsite

iddingsite

[′id·iŋ‚zīt]
(mineralogy)
A reddish-brown mixture of silicates, forming patches in basic igneous rocks.
Mentioned in ?
References in periodicals archive ?
Composition measurements of the Y000593 spherules show that they are significantly enriched in carbon compared to the nearby surrounding iddingsite layers.
Moreover, its phenocrystal unity is a compound of plagioclase, kaersutite, iddingsite olivine minerals.
2 Olivine or iddingsite Most probably collected porphyritic basalt as a pebble Item no.
Olivine occurs in nearly ail cumulates as sub- to anhedral grains, and is partly altered to serpentine or iddingsite.
The lherzolite is composed of olivine (mostly altered to iddingsite and serpentine) enclosed by blurry clinopyroxene oikocrysts.
Analyzing 10 samples of the meteorite by radioactive dating, the team found that the iddingsite formed between 274 and 655 million years ago.