Obsidian
Volcanic Glass (Amorphous Silica, SiO2)
Category
Browse mineral (man made glass) specimens identified by the Rock Identifier community.
Obsidian
Volcanic Glass (Amorphous Silica, SiO2)
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Citrine
Citrine (Silicon Dioxide - SiO2)
Quartz (Milky/Clear Quartz)
Silicon Dioxide (SiO2)
Blue lace agate (tumbled)
Microcrystalline quartz, SiO₂ (chalcedony variety)
Quartz pebble
Silicon dioxide (SiO2)
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2)
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Smoky Quartz
Silicon Dioxide (SiO2)
Quartz Nut
SiO2 (Silicon Dioxide)
Polished orbicular jasper (likely ocean jasper)
Silicified microcrystalline quartz/chalcedony with iron-oxide-rich orbicules; commonly called Ocean Jasper
Muscovite Mica (Granitic Pegmatite)
Muscovite - KAl2(AlSi3O10)(OH)2
Sandstone
Arenite (Clastic Sedimentary Rock)
Fluorite
Calcium Fluoride (CaF2)
Golden Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Potassium Feldspar (Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
Tektite
Natural impact glass
Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Sandstone (Quartz-rich)
Arenite
Quartz (Milky or Rough Quartz)
Silicon Dioxide (SiO2)
Amethyst and Green Aventurine (Tumbled Gemstones set in a wand)
Quartz (SiO2) varieties - Amethyst and Aventurine
Pink Granite (Unakite-bearing or Epidote-bearing Granite)
Plutonic Igneous Rock (Granite)
Blue-green raw mineral specimen, likely apatite
Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)
Fulgurite
Fulgurite (Lechatelierite-rich variety)
Clear quartz crystal point
Quartz (silicon dioxide, SiO₂), likely a polished or cut crystal
Quartz Crystal Matrix
Silicon Dioxide (SiO2)
Quartz pebble
Silicon dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Tumbled Rose Quartz
Silicon Dioxide (SiO2)
Garden Quartz (Lodalite)
Silicon Dioxide with various mineral inclusions (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)