Transparency Crystals are translucent and rarely transparent. Crystal Habit is typically in flattened tabular crystals with rare rhombohedral terminations. Also found in lamellar and fibrous aggregates and as foliated masses. Brucite has been known to pseudomorph crystals of periclase . Cleavage is perfect in one direction, basal.
Fracture is uneven.
Streak is white. Associated Minerals are calcite , wollastonite , nepheline , talc , aragonite , serpentine , chromite , dolomite , magnesite , periclase and other magnesium minerals.