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.
지구에서 가장 자성이 강한 천연 광물로, 검은색이며 쉽게 자석에 끌린다.
| 결정계 | Cubic (Isometric) |
| 광물 분류 | 04 Oxides and Hydroxides |
| 모스 경도 | 5.5-6.5 |
| 비중 | 5.17-5.18 |
| 색상 | Black |
| 광택 | Metallic |
| 조흔색 | Black |
| 벽개 | None |
| 단구 | Conchoidal to uneven |
| 투명도 | Opaque |
| 결정 습성 | Octahedral, dodecahedral, massive |
모스 경도
| 모스 경도 | Reference Mineral |
|---|---|
| 1 | Talc |
| 2 | Gypsum |
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase |
| 7 | Quartz |
| 8 | Topaz |
| 9 | Corundum |
| 10 | Diamond |
결정계
| 특성 | Value |
|---|---|
| 결정계 | Cubic (Isometric) |
| Axial Relationships | a = b = c, α = β = γ = 90° |