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Table 2
Typical mineral composition of chondrites, mass-densities ϱ of components, mass-fractions Xmin of minerals, and mass-fractions Xel of the elements that release heat by radioactive decays (data for Xmin from Yomogida & Matsui 1983).
| H-chondrite | L-chondrite | H-chondrite | L-chondrite | ||||||
| Species | Composition | ϱ | Xmin | Composition | ϱ | Xmin | Element | Xel | Xel |
| g cm-3 | g cm-3 | ||||||||
|
|
|||||||||
| Olivine | Fo80Fa20 | 3.51 | 0.37 | Fo75Fa25 | 3.58 | 0.49 | Al | 9.10 × 10-3 | 8.95 × 10-3 |
| Orthopyroxene | En83Fs17 | 3.25 | 0.25 | En78Fs22 | 3.27 | 0.23 | Fe | 2.93 × 10-1 | 2.26 × 10-1 |
| Clinopyroxene | En49Fs6Wo45 | 3.09 | 0.05 | En48Fs8Wo44 | 3.10 | 0.06 | K | 7.07 × 10-4 | 7.07 × 10-4 |
| Plagioclase | Ab82Or6An12 | 2.64 | 0.08 | Ab84Or6An10 | 2.64 | 0.08 | Th | 5.16 × 10-8 | 5.72 × 10-8 |
| Nickel-iron | Irn92Nkl8 | 7.90 | 0.20 | Irn87Nkl13 | 7.95 | 0.09 | U | 2.86 × 10-8 | 3.17 × 10-8 |
| Troilite | Tr | 4.91 | 0.05 | Tr | 4.91 | 0.05 | |||
| Average = ϱbulk | 3.78 | 3.59 | |||||||
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