2009 الموسوعة العلمية للصخور والمعادن kfas معدن الكلسيت علوم الأرض والجيولوجيا تُعد مجموعة الكَلسيت مجموعة معادن هامة تتشكل نمطياً في كتل كبيرة أو في بلورات سداسية لؤلؤية . وتتشكل عندما يتحد مركّب كربونات (كربون وأكسجين ...

Calcium. The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant metal in the earth's crust. The metal is trimorphic, harder than sodium, but softer than well as beryllium and aluminium, and unlike the alkaline metals, it doesn't cause skinburns. It is less chemically reactive than alkaline metals and than the other alkalineearth ...

Define trimming diagnostic cast. trimming diagnostic cast synonyms, trimming diagnostic cast pronunciation, trimming diagnostic cast translation, English dictionary definition of trimming diagnostic cast. a group of actors: the cast for the play was chosen; mold or pattern; a tinge; to throw forcefully: cast the first stone Not to be confused ...