Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)
igneous
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
Dearest Jewelry (Multigemstone)
Combination of Diamond (C), Emerald (Be3Al2Si6O18), Amethyst/Rock Crystal (SiO2), Ruby (Al2O3), Emerald (Be3Al2Si6O18), Sapphire (Al2O3), and Topaz (Al2SiO4(F,OH)2)
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Black Sapphire
Corundum (Al2O3)
mineral
Titanium Quartz (Rough)
Titanium-included Silicon Dioxide (SiO2 + Ti)
mineral
Banded Agate (specifically Chalcedony nodule)
Agate (Silicon Dioxide, SiO2)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Carnelian
Carnelian Chalcedony (SiO2 with iron oxide impurities)
mineral
Zebra Jasper (Zebra Stone)
Silicon Dioxide (SiO2) with iron oxide and manganese inclusions
sedimentary
Mookaite Jasper
Radiolarite (Silica, SiO2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) with trace Iron Oxide
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Amber
Fossilized Tree Resin (Succinate)
mineral
Carnelian
SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony
mineral
Amber
Succinite (Resin C10H16O)
mineral
Snowflake Obsidian (or similar porphyritic volcanic rock)
Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)
igneous
Amazonite
Amazonite (KAlSi3O8) - a variety of Microcline Feldspar
Mineral
Iridescent Ammonite
Ammonoidea (Species: likely Cleoniceras or Desmoceras); Mineral: Aragonite/Ammolite (CaCO3)
sedimentary (fossilized)
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Citrine
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Picture Jasper
Silicon Dioxide (SiO2)
sedimentary
Geode (Unopened)
Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)
sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Moqui Marble (Shaman Stone)
Ironstone Concretion (Fe2O3) - primarily Hematite or Goethite shell with Sandstone core
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Banded Calcite (often sold as Onyx or Mexican Onyx)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)
mineral
Red Jasper
Jasper (Silicon Dioxide) - SiO2
mineral
Red Garnet
Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)
mineral
Amethyst
Silicon Dioxide (SiO2 with iron impurities)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Carnelian
Carnelian (Silicon Dioxide - SiO2 with iron oxide impurities)
mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
metamorphic