This 15" Strand of 13mm x 10mm flat puff beads is gray marble from the Marble Canyon of Arizona. It is varying shades of gray with hints of pink.: The lepidolite beads are 14mm round flattened puffs. They are a deep purple with paler inclusions. It is in the mica family called lithium which is the lightest metal. It is the mineral in the drug lithium used for its calming effects. It is also called the Peace Stone.