| NOUN | substance | felspar, feldspar | any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium |
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| Meaning | Any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium. | |
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| Synonym | feldspar | |
| Narrower | moonstone | A transparent or translucent gemstone with a pearly luster |
| orthoclase | A white or colored monoclinic feldspar | |
| plagioclase, oligoclase | Any of a series of triclinic feldspars that form rocks | |
| Broader | spar | Any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable |
| Substances | silicon, Si, atomic number 14 | A tetravalent nonmetallic element |
| Spanish | feldespato | |
| Catalan | feldspat | |
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