What are vivianite and greigite, and how do their detections inside Mars's Cheyava Falls sample contribute to the case for ancient microbial life?
What are vivianite and greigite? Vivianite Vivianite is a hydrated iron phosphate — basically a mineral made of iron, phosphorus, oxygen, and water locked in its structure 1 24 . It is quite soft you could scratch it with a fingernail , with a Mohs hardness of only 1.5–2, and...
4000