Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Banded Siltstone
Siltstone with planar bedding
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Beryl (Emerald variety in host rock)
Be3Al2(SiO3)6 (Silicate mineral)
mineral
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Blue Quartz (Dumortierite Quartz)
Quartz (SiO2) with inclusions of Dumortierite (Al7(BO3)(SiO4)3O3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Smoky Quartz (SiO2 - Silicon Dioxide with aluminum impurities)
mineral
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Druzy Quartz (on Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Green Quartz (Prasiolite variant or Aventurine)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Black Opal
Hydrated Silica (SiO2·nH2O)
Mineraloid
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Rainbow Moonstone
White Labradorite (formula: (Na,Ca)(Al,Si)4O8)
mineral
Black Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Hematitic Sandstone
Sandstone with Iron Oxide (Hematite) staining
sedimentary
Ferruginous Sandstone (with possible trace fossils)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3)
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Moonstone (Tumbled)
Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8
mineral
Amethyst (Raw)
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Ironstone Concretion (Limonite/Goethite)
Ferruginous Siltstone / Limonite Concretion (FeOO(OH)·nH2O)
sedimentary
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Olivine (often within Peridotite)
Magnesium iron silicate, (Mg,Fe)2SiO4
mineral
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Green Fluorite (likely synthetic or heat-treated for jewelry)
Calcium Fluoride (CaF2)
mineral
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Conglomerate
Conglomerate
sedimentary
Beryl (Emerald Variety)
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary