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"A"

Gemstone	Crystal System	Density	Hardness	Refractive index	Treatments
Achroite	trigonal	3.06	7.0-7.5	1.624-1.644	none known
Actinolite	monolinic	3.00	5-6	1.602-1.655	none known
Adamite	orthorhombic	4.32-4.68	3.5	1.710-1.768	none known
Agate	microcrystalline	2.66	6.5-7.0	1.544-1.553	dying
Afghanite	hexagonal	2.55-2.65	5.5-6.0	1.523-1.529	one known
Ajoite	triclinic	2.96	3.5	1.550-1.641	none known
Alexandrite	orthorhombic	3.72	8.5	1.746-1.755	none known
Allanite	monoclinic	3.40-4.20	6-7	1.640-1.828	none known
Albite	triclinic	2.57-2.77	6.0-7.0	1.527-1.590	none known
Amazonite	triclinic	2.56	7.0-7.5	1.522-1.530	none known
Amber	amorphous	1.08	2.0-2.5	1.54	heating, oiling, reconstitution
Amblygonite	triclinic	2.9-3.11	5.5-6.0	1.578-1.636	none known
Amethyst	hexagonal	2.66	7	1.544-1.553	heating alters to citrine
Ametrine	hexagonal	2.66	7	1.544-1.553	none known
Ammolite	Aggregate	2.60-2.85	4.5-5.5	1.520-1.680	Opticon, Coating
Anatase	tetragonal	3.82-3.97	5.5-6.0	2.488-2.564	none known
Andalusite	orthorhombic	3.2	7.5	1.63-1.64	none known
Andesine	triclinic	2.66	6.0-6.5	1.542-1.562	diffused
Apatite	hexagonal	3.2	5	1.63-1.64	heat
Apophyllite	tetragonal	2.40	4.5-5.0	1.535-1.537	none known
Aquamarine	hexagonal	2.72	7.5-8.0	1.577-1.583	heat
Axinite	Triclinic	3.28	6.5-7.0	1.674-1.706	none known
Azurite	monoclinic	3.7-3.8	3.5-4.0	1.730-1.838	none known

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