anatase — species of mineral; data; faceted specimens exist …
andalusite — species of mineral; see andalusite in ‘Classification’ …
andesine — variety of albite; data; see andesine in ‘Classification’ …
andradite — species of mineral; see andradite in ‘Classification’ …
angelite — variety of anhydrite; see angelite in ‘Classification’ …
anglesite — species of mineral; data; faceted specimens exist …
anhydrite — species of mineral; see anhydrite in ‘Classification’ …
anorthite — species of mineral; see anorthite in ‘Classification’ …
anorthite-albite series — a series between anorthite and albite; see anorthite-albite series in ‘Classification’ …
anorthosite — an intrusive igneous rock …
anthophyllite — species of mineral; data; constituent of nuummite …
antigorite — species of mineral; see antigorite in ‘Classification’ …
aquamarine — variety of beryl; see aquamarine in ‘Classification’ …
aragonite — species of mineral; see aragonite in ‘Classification’ …
arfvedsonite — species of mineral; data; faceted specimens exist …
argillite — a fine-grained sedimentary rock composed predominantly of indurated clay particles …
aventurine — a rock; see aventurine in ‘Classification’ …
axinite-(Fe) — species of mineral; see axinite-(Fe) in ‘Classification’ …
axinite-(Mg) — species of mineral; see axinite-(Mg) in ‘Classification’ …
