Red Garnet
Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)
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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Pyritic Sandstone
Clastic Sedimentary Rock (Pyrite-bearing Sandstone)
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Smoky Quartz and Clear Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
Quartz (Microcrystalline variety)
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Mineral
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral
Rough Dark Green Sapphire
Corundum (Al2O3)
mineral
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Ruby (Pink to Red Corundum)
Al2O3 (Corundum with Chromium impurities)
mineral
Septarian Nodule (Dragon Stone)
Carbonate concretion (Calcite and Aragonite in Limestone/Clay)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Satin Spar (Selenite)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Citrine (Quartz variant)
SiO2 (Silicon Dioxide)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Ferruginous Sandstone
Arenite with Hematite/Goethite cement
sedimentary
Glauconitic Sandstone
Glauconitic sandstone ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Beach Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus), composed of CaCO3 (Aragonite/Calcite)
fossil
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Limestone (Cliff Formation)
Limestone (predominantly CaCO3 as calcite)
Sedimentary
Blue Tiger's Eye
Crocidolite in Quartz (altered)
Mineral
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Banded Gneiss
Gneiss (pronounced "nice")
Metamorphic Rock
Jasper with Manganese Dendrites
Silicon Dioxide (SiO2) with Oxide Mineral Inclusions
sedimentary
Puddingstone (Gowganda Tillite/Lorrain Quartzite)
Jasper Conglomerate
sedimentary
Petrified Wood
Silicified wood (Quartz, Chalcedony, or Opal)
sedimentary
Septarian Nodule (Dragon Stone)
Septarian (composed of Calcite CaCO3, Aragonite CaCO3, and Limestone/Clay)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pink Botswana Agate
Silicon Dioxide (SiO₂), a cryptocrystalline variety of Quartz and Chalcedony
sedimentary
Specular Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral