Monthly Archives: June 2019

                    Grandidierite is an extremely rare mineral and gem that was first discovered in 1902 in southern Madagascar. Formula: (Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2 Colour: Bluish green, greenish blue Lustre: Vitreous, Pearly Hardness: 7½ Specific Gravity: 2.98 – 2.99 Crystal System: Orthorhombic          This gemstone was named in honor of French explorer Alfred Grandidier who studied the natural history […]