mineral on coffee tumbler

a few days ago I bought this tumbler accidentally (long sory,,cih!) and forced in Plaza Indonesia entertainment X'nter (EX) ..its really expensive for a tumbler!! well,for me it is.. its $14 WOW!!! for a tumbler?? i can get a pair of shoe for that money..*sigh!
well,it is what it is..Look now,the tumbler was sitting pretty on my messy desk at the office
he seems so happy..let he stay for a while,shall we?lol