Labradorite is a plagioclase feldspar with sub-vitreous luster, known for iridescent plays of color within the specimen called “labradorescence.” First found on Canada’s Labrador Peninsula, most specimens seen today come from Madagascar.
Chemical composition: (Ca,Na)[Al(Al,Si)Si2O8]; Hardness: 6-6.5
Moonstone is an orthoclase feldspar with an opalescent or pearly luster referred to as adularescence. The moonlight effect of this stone is caused by alternating layers of orthoclase and albite. Moonstone is the most popular gemstone from the feldspar group, the greatest source of moonstone is in Sri Lanka.
Hardness: 6
Silver was known as Argentum in ancient Rome, thus its abbreviation as Ag. It is a member of the copper group.
Chemical composition: Ag; Hardness: 2.5-3