We assume you are converting between milligram and gram. You can view more details on each measurement unit: milligrams or gram. The SI base unit for mass is the kilogram. 1 kilogram is equal to 1000000 milligrams, or 1000 gram.
Copper, in spiritual alchemy, represents experiences with love, sympathy and affection. The world would be a harsh, bleak land without the refining influence of copper. There would be no appreciation of beauty, no knowledge of harmony; none of the softer shading of life that soothe the sting of adversity.
Trevelyan may be correct concerning the significance of symbolism in the prehistoric use of copper, but wrong in her belief that symbolism superseded or excluded utility. Cultural difference (motif and form) associated with implements created for identical use is exemplified in copper projectile points.