| NOUN | substance | realgar | a rare soft orange mineral consisting of arsenic sulphide |
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| Meaning | A rare soft orange mineral consisting of arsenic sulphide; an important ore of arsenic. | |
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| Broader | mineral | Solid homogeneous inorganic substances occurring in nature having a definite chemical composition |
| Substances | arsenic, As, atomic number 33 | A very poisonous metallic element that has three allotropic forms |