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.
地球上磁性最强的天然矿物，呈黑色。具有强磁性，易被磁铁吸引。
| 晶系 | Cubic (Isometric) |
| 矿物分类 | 04 Oxides and Hydroxides |
| 莫氏硬度 | 5.5-6.5 |
| 比重 | 5.17-5.18 |
| 颜色 | Black |
| 光泽 | Metallic |
| 条痕色 | Black |
| 解理 | None |
| 断口 | Conchoidal to uneven |
| 透明度 | Opaque |
| 晶体习性 | Octahedral, dodecahedral, massive |
莫氏硬度
| 莫氏硬度 | 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° |