1) Luminescent mineral 2) Magnesium mineral 
Hydromagnesite is a hydrated magnesium carbonate mineral with the formula Mg5(CO3)4(OH)2·4H2O. It generally occurs associated with the weathering products of magnesium containing minerals such as serpentine or brucite. It occurs as incrustations and vein or fracture fillings in ultramafic rocks and serpentinites. It occurs in hydrothermally alter...
• (n.) A hydrous carbonate of magnesia occurring in white, early, amorphous masses.
Hy`dro·mag'ne·site (hī`dro*măg'ne*sīt) noun [ Hydro- , 1 + magnesite .] (Min.) A hydrous carbonate of magnesia occurring in white, earthy, amorphous masses. 
Hydromagnesite is a hydrous carbonate of magnesia occurring in white, earthy, amorphous masses.
Magnesium carbonate, basic