Obsidian, a natural volcanic glass, stands out with its deep black hue.

In some stones, the inclusion of small, white, radially clustered crystals of cristobalite in the black glass produce a blotchy or snowflake pattern, and this is known in the gem trade as snowflake obsidian. In addition to its use as a gemstone, obsidian has been used in cardiac surgery, as well-crafted obsidian blades have a cutting edge many times sharper than high-quality steel surgical scalpels. Obsidian has been known since prehistoric times, and has some fascinating properties as well as some important practical uses. It is formed when felsic lava extruded from a volcano cools without crystal growth. Obsidian is a naturally occurring volcanic glass.

Obsidian Obsidian Gemstone: A Unique and Timeless Beauty Actinolite Cat's Eye 61 Agate 675 Agate Geode 20 Almandine Garnet 38 Amazonite 230 Amethyst 3,026 Amethyst Geode Slice 84 Ametrine 226 Ammolite 462 Andalusite 207 Andesine Labradorite 151 Apatite 581 Aquamarine 121 Aventurine 140 Azotic Topaz 14 Azurite 23 Black Opal 240 Bloodstone 176 Boulder Opal 226 Carnelian 98 Cat's Eye Apatite 40 Cat's Eye Aquamarine 18 Cat's Eye Gemstones 1,153 Cat's Eye Moonstone 83 Cat's Eye Opal 178 Cat's Eye Scapolite 102 Chalcedony 143 Charoite 131 Chocolate Opal 76 Chrome Diopside 13 Chrysoberyl 111 Chrysoberyl Cat's Eye 178 Chrysocolla 74 Chrysoprase 42 Citrine 4,195 Color Change Gemstones 859 Color-Change Diaspore 737 Color-Change Fluorite 60 Color-Change Garnet 62 Coral 299 Demantoid Garnet 251 Dendritic Agate 130 Diamond 747 Druzy Amethyst 5 Druzy Azurite 23 Druzy Citrine 54 Druzy Variscite 132 Emerald 892 Enstatite 5 Fire Agate 347 Fire Opal 187 Fluorite 214 Fossil Coral 332 Garnet 5,874 Golden Beryl 193 Grandidierite 193 Grossularite Garnet 51 Hawk's Eye 1 Hematite 382 Hemimorphite 48 Hemimorphite Druzy 48 Hessonite Garnet 2,107 Howlite 148 Idocrase 29 Imperial Topaz 12 Iolite 191 Jade Gemstones 336 Jadeite 336 Jasper 1,375 Kornerupine 250 Kunzite 412 Kyanite 666 Labradorite 530 Lapis Lazuli 223 Larimar 172 Lepidolite 58 Malachite 195 Malaya Garnet 163 Mali Garnet 13 Maw-Sit-Sit 135 Moonstone 755 Morganite 862 Moss Agate 73 Mother Of Pearl 105 Mystic Quartz 237 Mystic Topaz 50 Nuummite 125 Obsidian 255 Onyx 320 Opal 1,111 Opal Doublet 6 Opal In Matrix 21 Peanut Wood 20 Pearl 22 Peridot 1,355 Pietersite 589 Prehnite 843 Psilomelane Dendrite 26 Pyrite 17 Pyrope Garnet 1,938 Quartz 1,336 Quartz Cat's Eye 85 Quartz With Hedenbergite 10 Quartz With Marcasite 192 Rainbow Moonstone 649 Rainbow Pyrite 190 Rhodochrosite 162 Rhodolite Garnet 501 Rhodonite 42 Rose Quartz 771 Rubellite Tourmaline 16 Ruby 1,136 Ruby In Fuchsite 97 Ruby-Zoisite 221 Rutile Quartz 574 Sapphire 4,546 Scapolite 102 Scolecite 35 Seraphinite 58 Serpentine 81 Sillimanite 77 Sillimanite Cat's Eye 408 Smithsonite 1 Smoky Quartz 1,069 Snowflake Obsidian 37 Sodalite 37 Spectrolite 150 Spessartite Garnet 374 Sphalerite 313 Sphene 515 Spinel 996 Star Diopside 11 Star Garnet 59 Star Gemstones 871 Star Moonstone 101 Star Rose Quartz 20 Star Ruby 181 Star Sapphire 492 Star Sunstone 7 Strawberry Quartz 909 Sunstone 500 Tanzanite 788 Tiger's Eye 860 Tiger's Eye Matrix 171 Topaz 4,545 Tourmaline 2,092 Tsavorite Garnet 255 Turquoise 101 Uvarovite Garnet Drusy 62 Variscite 11 Zircon 2,114

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