Titanium is often present, and occasionally the mineral contains magnesium, nickel, &c. It is always strongly magnetic. Magnetite crystallizes in the cubic system, usually in octahedra, less commonly in rhombic dodecahedra, and not infrequently in twins of the spinel type (fig.
dodecahedra הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד