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Agate is a microcrystalline variety of silica, found in various types of rocks, although mostly volcanic.
Chrysoprase is gemstone variety of chalcedony, classified as cyrpto-crystalline. The name is derived from Greek:chrysos, meaning 'gold and prasinon, meaning 'green.'
Pyrite is a mineral that is an iron sulfide, more commonly known as fool’s gold. It is mostly found in coal mines. Name is derived from Greek: purites, meaning ‘of fire.’
Please note that due to the nature of vintage materials, slight variations in tone and color may occur.
Due to the aberrant nature of minerals, each piece of gem/mineral is unique.