Magnetit
| Magnetit | |
|---|---|
 Magnetit dan pirit dari Piedmont, Italia | |
| Umum | |
| Kategori | Mineral oksida Spinel group Spinel structural group |
| Rumus (unit berulang) | iron(II,III) oxide, Fe2+Fe3+2O4 |
| Klasifikasi Strunz | 04.BB.05 |
| Sistem kristal | Isometrik Heksoktahedral |
| Grup ruang | Isometric 4/m 3 2/m |
| Sel unit | a = 8.397 Å; Z=8 |
| Identifikasi | |
| Warna | Hitam, abu-abu sedikit coklat jika direfleksikan pada matahari |
| Perawakan | Oktahedral, granular halus sampai besar |
| Bentuk kembaran | On {Ill} as both twin and composition plane, the spinel law, as contact twins |
| Belahan | Indistinct, parting on {Ill}, very good |
| Fraktur | Uneven |
| Sifat dalam | Rapuh |
| Kekerasan dalam skala Mohs | 5.5–6.5 |
| Kilau | Logam |
| Gores | Hita, |
| Diafaneitas | Opaque |
| Berat jenis | 5.17–5.18 |
| Kelarutan | Larut perlahan pada asam klorida |
| Referensi | [1][2][3][4] |
| Variasi utama | |
| Lodestone | Magnetic with definite north and south poles |
Magnetit adalah mineral dan satu dari tiga besi oksida paling umum di alam. Rumus kimianya Fe3O4. Magnetit adalah mineral yang paling memiliki sifat magnet di antara semua mineral alam di bumi.[5] Magnetit jenis khusus yang disebut lodestone dapat menarik sejumlah kecil besi, hal ini yang membuat orang zaman kuno pertama kali menemukan sifat-sifat magnetisme.
Referensi
[sunting | sunting sumber]- ^ "Handbook of Mineralogy" (PDF). Diarsipkan dari versi asli (PDF) tanggal 2015-09-24. Diakses tanggal 2016-01-20.
- ^ Mindat.org Mindat.org
- ^ Webmineral data
- ^ Hurlbut, Cornelius S.; Klein, Cornelis (1985). Manual of Mineralogy (edisi ke-20th). Wiley. ISBN 0-471-80580-7.
- ^ Harrison, R. J.; Dunin-Borkowski, RE; Putnis, A (2002). "Direct imaging of nanoscale magnetic interactions in minerals" (free-download pdf). Proceedings of the National Academy of Sciences. 99 (26): 16556–16561. Bibcode:2002PNAS...9916556H. doi:10.1073/pnas.262514499. PMC 139182
. PMID 12482930.
Bacaan lanjut
[sunting | sunting sumber]- Lowenstam, Heinz A.; Weiner, Stephen (1989). On Biomineralization. USA: Oxford University Press. ISBN 0-19-504977-2.
- Chang, Shih-Bin Robin; Kirschvink, Joseph Lynn (1989). "Magnetofossils, the Magnetization of Sediments, and the Evolution of Magnetite Biomineralization" (PDF). Annual Review of Earth and Planetary Sciences. 17: 169–195. Bibcode:1989AREPS..17..169C. doi:10.1146/annurev.ea.17.050189.001125.
Pranala luar
[sunting | sunting sumber]- Mineral galleries
- Bio-magnetics
- History of Magnetite Mining in the NJ Highlands
- Magnetite mining in New Zealand Diarsipkan 2012-11-19 di Wayback Machine. Accessed 25-Mar-09