http://www.potsaa.com/lead-crystal/

What is the difference between crystal and lead crystal regularly?
I looked online crystal ball, which was described as Lead crystal. I have some little balls of quartz crystal, and I heard glass lead crystal and stuff, so I just wondered making it "crystal lead?" The one I saw online was clear
The "lead crystal term is used to describe glass containing a high proportion of lead oxide. Lead oxide is added to increase the refractive index of the glass which results in a glass which is very bright and clear. It has some drawbacks such as lead glass is softer than the glass of regular soda and if it scratches easily, so it should never be put in a washing machine the chemicals used for cleaning the surface deteriorate very quickly and turn .. Cloudy It is unfortunate that the lead glass is called "crystal", which is very confusing because the glass is not crystalline. Hope that substance helps a little.
Diamond Bottlenecks – Lead crystal tone bars for lap guitar