Blue Gemstones

TRANGSUCVN.COM 2014-06-15 990 lượt xem

Blue Gemstones

Gemstone	Crystal System	Density	Hardness	Refractive index	Treatments
Agate	microcrystalline	2.66	6.5-7.0	1.544-1.553	dying
Aquamarine	hexagonal	2.72	7.5-8.0	1.577-1.583	heat
Apatite	hexagonal	3.2	5	1.63-1.64	heat
Azurite	monoclinic	3.7-3.8	3.5-4.0	1.730-1.838	none
Benitoite	hexagonal	3.64	6.0-6.5	1.757-1.804	none
Chrysocolla	microcrystalline	2.00-2.24	2-4	1.54	none
Corundum	trigonal	4.00	9.0	1.762-1.770	heat
Diamond	cubic	3.52	10	2.417	radiation, drilling, fracture filling
Lapis Lazuli	various	2.75	5.50	1.500	none
Moonstone	monoclinic	2.56	6.0-6.5	1.518-1.526	none
Sapphire	hexagonal	4.00	9	1.762-1.770	heat, fracture filling
Spinel	cubic	3.60	8	1.718	none
Tanzanite	orthorhombic	3.30	6.0-7.0	1.690-1.700	heat
Topaz	orthorhombic	3.53	8.0	1.619-1.627	blue is irradiated
Tourmaline	trigonal	3.06	7.0-7.5	1.624-1.644	heat
Turquoise	triclinic	2.73	5.0-6.0	1.610-1.650	dying, sealing
Zircon	tetragonal	4.00	6.50	1.810-1.815	none