The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; th…
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a member, substance or component part.
Same as Hematite.
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a member, substance or component part.
An important ore of iron, the sesquioxide, so called because of the red color of the powder. It occurs in splendent rhombohedral crystals, and in mas…
oewn 2023
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Open English WordNet identifies the related term as a member, substance or component part.
An oxide of iron (Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and…
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a member, substance or component part.