Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
magnetic form of iron sulfide,Fe 2+Fe3+2S 4, analogous tomagnetite , produced bymicroorganisms and found in lakesediments ; Note: half the iron ions areferrous and halfferric .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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These mineral crystals were identified as magnetite, pyrrhotite, and greigite.
The Case for Mars Robert Zubrin 1996
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This evidence includes the oxygen isotope ratio data, the presence of greigite within the carbonates, and the presence of organic molecules—all would be destroyed or degraded if heated to 450°C.
The Case for Mars Robert Zubrin 1996
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These mineral crystals were identified as magnetite, pyrrhotite, and greigite.
The Case for Mars Robert Zubrin 1996
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This evidence includes the oxygen isotope ratio data, the presence of greigite within the carbonates, and the presence of organic molecules—all would be destroyed or degraded if heated to 450°C.
The Case for Mars Robert Zubrin 1996
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Magnetosomes are composed of single-domain magnetic nanocrystals of magnetite or greigite (35 nm to 120 nm long) embedded in biological membranes.
PLoS ONE Alerts: New Articles Jean-Baptiste Rioux et al. 2010
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Magnetosomes are composed of single-domain magnetic nanocrystals of magnetite or greigite (35 nm to 120 nm long) embedded in biological membranes.
PLoS ONE Alerts: New Articles Jean-Baptiste Rioux et al. 2010
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Thomas-Keprta’s doubts fell away as she positively identified minute grains of the mineral greigite, which, in the size range she discovered, is more often than not produced by bacteria, at least here on Earth.
The Case for Mars Robert Zubrin 1996
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Thomas-Keprta’s doubts fell away as she positively identified minute grains of the mineral greigite, which, in the size range she discovered, is more often than not produced by bacteria, at least here on Earth.
The Case for Mars Robert Zubrin 1996
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