Magnetite
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The most strongly magnetic mineral found in nature, magnetite is an iron oxide (Fe3O4) and an important ore of iron. It crystallizes in the cubic system as octahedral, dodecahedral, or massive forms and is opaque with a metallic luster, a black color, a black streak, and no cleavage. Its Mohs hardness ranges from 5.5 to 6.5 and its specific gravity from 5.17 to 5.18. Naturally magnetized specimens, called lodestone, served as an early form of compass, and magnetite's magnetism remains its most distinctive diagnostic property. Its octahedral crystals, black streak, and absence of cleavage complete a straightforward identification. It is a major constituent of banded iron formations, which supply much of the world's iron ore.
地球で最も磁性の強い天然鉱物で、黒色である。易磁性があり、磁石に容易に引き付けられる。
| 晶系 | Cubic (Isometric) |
| 鉱物分類 | 04 Oxides and Hydroxides |
| モース硬度 | 5.5-6.5 |
| 比重 | 5.17-5.18 |
| 色 | Black |
| 光沢 | Metallic |
| 条痕色 | Black |
| 劈開 | None |
| 断口 | Conchoidal to uneven |
| 透明度 | Opaque |
| 結晶習性 | Octahedral, dodecahedral, massive |
モース硬度
| モース硬度 | Reference Mineral |
|---|---|
| 1 | Talc |
| 2 | Gypsum |
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase |
| 7 | Quartz |
| 8 | Topaz |
| 9 | Corundum |
| 10 | Diamond |
晶系
| 特性 | Value |
|---|---|
| 晶系 | Cubic (Isometric) |
| Axial Relationships | a = b = c, α = β = γ = 90° |