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Mae ffelsbar (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8) yn fwyn tectosilicad sydd yn ffurfio cymaint â 60% o gramen y Ddaear.
Enghraifft o'r canlynol | mineral group |
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Math | tectosilicates |
Ffeiliau perthnasol ar Gomin Wicimedia |
Mae'r enw ffelsbar yn dod o'r geiriau Almaeneg Feld, "maes", a Spath, "craig heb fwynau".
Ceir ffelsbar hefyd ar y blaned Mawrth.
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