COVER CONTENT G Lass Glass Isa transparent material that can be melted down and molded into solid shapes. tis made from sand, soda ash, and limestone, but other minerals ike silica and barium can be added to manipulate ts color, durability, and thickness, Glass with low mineral count is non-porous, which makes glass dishwasher safe and heat resistant. CRYSTAL Crystal glass a transparent material made ‘with the same Ingredients as glass, but with added lead-oxide or metal-oxide.