1) Beautiful stone 2) Cubic mineral 3) Cut mineral 4) Decorative stone 5) Gemstone 6) Gemstone mineral 7) Jewel mineral 8) Jewel 9) Magnesia 10) Magnesium mineral 11) Magnesium oxide 12) Mineral gemstone 13) Mineral 14) Mineral jewel 15) Polished mineral 16) Polished jewel 17) Precious stone 18) Precious gemstone 1) Magnesia 
Periclase occurs naturally in contact metamorphic rocks and is a major component of most basic refractory bricks. It is a cubic form of magnesium oxide (MgO). It was first described in 1840 and named from the Greek περικλάω (to break around) in allusion to its cleavage. The type locality is Monte Somma, Somma-Vesuvius Complex, Naples Provi...
• (n.) Alt. of Periclasite
magnesium oxide mineral (MgO) that occurs as colourless to grayish, glassy, rounded grains in marble and in some dolomitic limestones, where it ... [1 related articles]
Magnesium oxide
[n] - a white solid mineral that occurs naturally as periclase
periclase A colorless, gray, green, or yellow magnesium oxide mineral.
Natural magnesia in nodular form, formed by heating.
magnesia noun a white solid mineral that occurs naturally as periclase; a source of magnesium