And one last time, with the help of the glossary found in SOUTHWEST INDIAN SILVER FROM THE DONEGHY COLLECTION, here is a guide to some of the important terms found in silverwork in general, and Southwest Indian silverwork in particular.(Illustrating photos are shown above the corresponding term.)
SHEET SILVER--silver formed into a flat sheet of uniform thickness, normally by mechanical means. Commercially produced sheet silver has been available in the Southwest since 1929.
SILVER--well, duh. Seriously, early silverwork (pre-1910, generally) was made from melted coins, which were normally around 90% silver and 10% copper. When laws were enacted making it illegal to destroy American currency, traders substituted silver ingots or slugs, which were a higher purity of silver. (Still looking to see when those laws were passed.)
TURQUOISE--the generally blue or blue-green mineral that is the most commonly used stone in Southwest Indian jewelry and silverwork.