Composition: Calcium magnesium iron silicate hydroxide
Nomenclature: Named after the Greek word "nephriticus" which means "kidney stone" because of its historical use as a remedy for kidney disease.
Industrial Uses: Gemstones, ornamental stones, carvings.
Additional Notes: A variety of the mineral actinolite. One of two minerals frequently referred to as "jade" (the other mineral being jadeite).
New Caledonia : Scott 473 : 30 francs : 17 Mar 1982
Anorthosite (feldspar); Nephrite (jade); Serpentine
New Zealand : Scott 755 : 1 cent : 1 Dec 1982