achondrite — a stony meteorite that does not contain chondrules …
achroite — variety of elbaite; see achroite in ‘Classification’ …
actinolite — species of mineral; see actinolite in ‘Classification’ …
adamite — species of mineral; data; faceted specimens exist …
adularescence — an optical phenomenon, best described as a milky, bluish luster or glow originating from below the surface of the gemstone …
aegirine — species of mineral; data; faceted specimens exist …
aeschynite-(Y) — species of mineral; data; faceted specimens exist …
afghanite — species of mineral; see afghanite in ‘Classification’ …
agate — variety of chalcedony, quartz; see agate in ‘Classification’ …
alabandite — species of mineral; data; faceted specimens exist …
albite — species of mineral; see albite in ‘Classification’ …
alexandrite — variety of chrysoberyl; see alexandrite in ‘Classification’ …
allanite-(Ce) — species of mineral; data; faceted specimens exist …
almandine — species of mineral; see almandine in ‘Classification’ …
amazonite — variety of microcline; see amazonite in ‘Classification’ …
amblygonite — species of mineral; see amblygonite in ‘Classification’ …
amethyst — variety of quartz; see amethyst in ‘Classification’ …
ametrine — variety of quartz; see ametrine in ‘Classification’ …
amphiboles — an extensive and complex group of minerals …
analcime — species of mineral; data; faceted specimens exist …
