Metal clay heating tests.
Shop Talk Gem Info
Gemstone Properties
Name | Structure | Hardness | Specific Gravity | Refractive index | Doubly Refracting (bi-refraction) |
Abalone | 2.5 | 1.3 | none | ||
Achroite (Tourmaline) | 7.5 | 3.06 | 1.62 - 1.6 | 0.018 | |
Agate ( Chalcedony) | 7 | 2.61 | 1.53 - 1.5 | 0.004 | |
Alexandrite | 8.5 | 3.73 | 1.741 - 1. | ||
Almandine ( Garnet ) | 7.5 | 4 | 1.76 - 1.8 | None | |
Amber | 2.5 | 1.08 | 1.54 - 1.5 | Not Availa | |
Amethyst ( Quartz) | 7 | 2.65 | 1.54 - 1.5 | 0.009 | |
Ammolite | Orthorhombic | 4 | 2.8 | 1.52 - 1.6 | |
Andalusite | 7.5 | 3.16 | 1.63 - 1.6 | 0.01 | |
Andradite Garnet | 6.5 | 3.85 | 1.85 - 1.8 | None | |
Apatite | 5 | 3.2 | 1.63- 1.64 | 0.003 | |
Aquamarine ( Beryl ) | 7.5 | 2.69 | 1.57 - 1.5 | 0.006 | |
Aventurine ( Quartz ) | 7 | 2.65 | 1.54 - 1.5 | 0.009 | |
Azurite | Monoclinic | 3.5 | 3.77 | 1.73 - 1.8 | 0.11 |
Benitoite | Hexagonal | 6.5 | 3.67 | 1.76 - 1.8 | 0.047 |
Bloodstone ( Chalcedony ) | 7 | 2.61 | 1.53 - 1.5 | 0.004 | |
Brown Quartz ( Smokey Quartz ) | 7 | 2.65 | 1.54 - 1.5 | 0.009 | |
Calcite | 3 | 2.71 | 1.48 - 1.6 | 0.172 | |
Carnelian ( Chalcedony ) | 7 | 2.61 | 1.53 - 1.5 | 0.004 | |
Cassiterite | 6.5 | 6.95 | 2.00 - 2.1 | 0.1 | |
Celestine | 3.5 | 3.98 | 1.62 - 1.6 | 0.01 | |
Cerussite | 3.5 | 6.51 | 1.80 - 2.0 | 0.274 | |
Chalcedony | 7 | 2.61 | 1.53 - 1.5 | 0.004 | |
Chatoyant Quartz | 7 | 2.65 | 1.54 - 1.5 | 0.009 | |
Chrysoberyl | 8.5 | 3.71 | 1.74 - 1.7 | 0.009 | |
Chrysocolla | 2 | 2.2 | 1.57 - 1.6 | 0.03 | |
Chrysoprase (Chalcedony) | 7 | 2.61 | 1.53 - 1.5 | 0.004 | |
Citrine ( Quartz ) | 7 | 2.65 | 1.54 - 1.5 | 0.009 | |
Coral | 3 | 2.68 | 1.49 - 1.6 | Not Availa | |
Danburite | 7 | 3 | 1.63 - 1.6 | 0.006 | |
Diamond | Cubic | 10 | 3.52 | 2.42 | None |
Diopside | 5.5 | 3.29 | 1.66 - 1.7 | 0.029 | |
Dioptase | 5 | 3.31 | 1.67 - 1.7 | 0.053 | |
Dravite ( Tourmaline) | 7.5 | 3.06 | 1.61 - 1.6 | 0.018 | |
Emerald ( Beryl ) | 7.5 | 2.71 | 1.57 - 1.5 | 0.006 | |
Enstatite | 5.5 | 3.27 | 1.66 - 1.6 | 0.01 | |
Epidote | 6.5 | 3.4 | 1.74 - 1.7 | 0.035 | |
Euclase | Monoclinic | 7.5 | 3.09 - 3.1 | 1.65 - 1.6 | 0.019 |
Fire Agate (Chalcedony) | Trigonal | 7 | 2.61 | 1.53 - 1.5 | 0.004 |
Fluorite | Cubic | 4 | 3.18 | 1.43 | None |
Gold | Cubic | 2.5 | 19.3 | None | None |
Goshenite (Beryl) | Hexagonal | 7.5 | 2.8 | 1.58 - 1.5 | 0.008 |
Grossular Garnet (Tsavorite Garnet) | Cubic | 7 | 3.49 | 1.69 - 1.7 | none |
Gypsum | Monoclinic | 2 | 2.32 | 1.52 - 1.5 | 0.01 |
Heliodor ( Beryl ) | Hexagonal | 7.5 | 2.8 | 1.57 - 1.5 | 0.005 |
Hematite | Trigonal | 6.5 | 5.2 | 2.94 - 3.2 | 0.28 |
Hessonite (Grossular Garnet) | Cubic | 7.25 | 3.65 | 1.73 - 1.7 | none |
Imperial Topaz | |||||
Indicolite ( Tourmaline) | Trigonal | 7.5 | 3.06 | 1.62 - 1.6 | 0.018 |
Iolite | Orthorhombic | 7 | 2.63 | 1.53 - 1.5 | 0.01 |
Ivory | Amorphous | 2.5 | 1.9 | 1.53 - 1.5 | not availa |
Jadeite | Monoclinic | 7 | 3.33 | 1.66 - 1.6 | 0.012 |
Jasper (Chalcedony) | Trigonal | 7 | 2.61 | 1.53 - 1.5 | 0.004 |
Jet | Amorphous | 2.5 | 1.33 | 1.64 - 1.6 | not availb |
Kornerupine | Orthorhombic | 6.5 | 3.32 | 1.66 - 1.6 | 0.013 |
Kunzite | Monoclinic | 7 | 3.18 | 1.66 - 1.6 | 0.015 |
Kyanite | Triclinic | 5 or | 3.68 | 1.71 - 1.7 | 0.017 |
Labradorite | Triclinic | 6 | 2.7 | 1.56 - 1.5 | 0.01 |
Lapis Lazuli ( Lazurite) | various | 5.5 | 2.8 | 1.5 | none |
Lazulite | Monoclinic | 5.5 | 3.1 | 1.61 - 1.6 | 0.031 |
Malachite | Monoclinic | 4 | 3.8 | 1.85 | 0.025 |
Meerschaum | Monoclinic | 2.5 | 1.5 | 1.51 - 1.5 | none |
Microcline | Triclinic | 6 | 2.56 | 1.52 - 1.5 | 0.008 |
Milky Quartz | Trigonal | 7 | 2.65 | 1.54 - 1.5 | 0.009 |
Moonstone | Monoclinic | 6 | 2.57 | 1.52 - 1.5 | 0.005 |
Morganite ( Beryl) | Hexagonal | 7.5 | 2.8 | 1.58 - 1.5 | 0.008 |
Nephrite ( Jade) | Monoclinic | 6.5 | 2.96 | 1.61 - 1.6 | 0.027 |
Obsidian | Amorphous | 5 | 2.35 | 1.48 - 1.5 | none |
Oligoclase | Triclinic | 6 | 2.64 | 1.54 - 1.5 | 0.007 |
Onyx | Trigonal | 7 | 2.61 | 1.53 - 1.5 | 0.004 |
Opal | Amorphous | 6 | 2.1 | 1.37 - 1.4 | none |
Orthoclase | Monoclinic | 6 | 2.56 | 1.51 - 1.5 | 0.005 |
Padparasha ( Corundum) | Trigonal | 9 | 4 | 1.76 - 1.7 | 0.008 |
Pearl | Orthorhombic | 3 | 2.71 | 1.53 - 1.6 | not availb |
Peridot | Orthorhombic | 6.5 | 3.34 | 1.64 - 1.6 | 0.036 |
Pink Topaz ( Mercury Myst Vapor ) | |||||
Plasma ( Chalcedony) | Trigonal | 7 | 2.61 | 1.53 - 1.5 | 0.004 |
Prase ( Chalcedony ) | Trigonal | 7 | 2.61 | 1.53 - 1.5 | 0.004 |
Prehnite | Orthorhombic | 6 | 2.87 | 1.61 - 1.6 | 0.016 |
Pyrite | Cubic | 6 | 4.9 | none | none |
Pyrope ( Garnet ) | Cubic | 7.25 | 3.8 | 1.72 - 1.7 | none |
Rock Crystal ( Quartz ) | Trigonal | 7 | 2.65 | 1.54 - 1.5 | 0.009 |
Rubellite ( Tourmaline) | Trigonal | 7.5 | 3.06 | 1.62 - 1.6 | 0.018 |
Ruby ( Corundum) | Trigonal | 9 | 4 | 1.76 - 1.7 | 0.008 |
Sapphire ( Corundum) | Trigonal | 9 | 4 | 1.76 - 1.7 | 0.008 |
Sardonyx ( Chalcedony) | Trigonal | 7 | 2.61 | 1.53 - 1.5 | 0.004 |
Scapolite | Tetragonal | 6 | 2.7 | 1.54 - 1.5 | 0.02 |
Schorl (Tourmaline) | Trigonal | 7.5 | 3.06 | 1.62 - 1.6 | 0.018 |
Shell | Various | 2.5 | 1.3 | 1.53 - 1.5 | not availa |
Spessarite (Garnet) | Cubic | 7 | 4.16 | 1.79 - 1.8 | none |
Sphalerite | Cubic | 3.5 | 4.09 | 2.36 - 2.3 | none |
Spinel | cubic | 8 | 3.6 | 1.71 - 1.7 | none |
Spodumene (Hiddenite - Triphane) | Monoclinic | 7 | 3.18 | 1.66 - 1.6 | 0.015 |
Tanzanite (Zoisite) | Orthorhombic | 6.5 | 3.35 | 1.69 - 1.7 | 0.01 |
Tektites ( Moldavite ) | Currently Out of Stock | 5 | 2.4 | 1.48 - 1.5 | none |
Tiger Eye | |||||
Titanite (Sphene) | Monoclinic | 5 | 3.53 | 1.84 - 2.0 | 0.12 |
Topaz | Orthorhombic | 8 | 3.54 | 1.62 - 1.6 | 0.01 |
Turquoise | Triclinic | 6 | 2.8 | 1.61 - 1.6 | 0.04 |
YAG (Garnet) | Isometric | 8.5 | 4.55 | 1.833 | |
Zircon | Tetragonal | 7.5 | 4.69 | 1.93 - 1.9 | 0.059 |