Yellow Calcite
Calcium Carbonate (CaCO3)
Mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Schorl (Black Tourmaline) in Pegmatite
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Chalcedony (Moonstone variant or White Agate)
Silicon Dioxide (SiO₂)
mineral
Ruby
Corundum (Al2O3 with Chromium)
mineral
Garnet Schist
Almandine-bearing Mica Schist
metamorphic
Sapphire (Blue)
Corundum (Al2O3)
mineral
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Garnet Schist
Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)
metamorphic
Porphyritic Basalt (with Lath-like Phenocrysts)
Porphyritic Basalt
igneous
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Banded Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Schist
Mica Schist (Group of medium-grade metamorphic rocks)
metamorphic
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
mineral
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Synthetic material (Not a rock or mineral)
Silver (Native Element)
Silver (Ag) in an alloy of 90% Silver and 10% Copper
mineral
Agate (Slab)
Agate (Cryptocrystalline variety of Quartz, SiO2)
Mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Basalt
Mafic Igneous Rock
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Stilbite
Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Honey Calcite (Yellow Calcite)
Calcium Carbonate (CaCO3)
mineral
Aquamarine on Feldspar Matrix
Beryl (Be3Al2Si6O18) with Potassium Feldspar (KAlSi3O8)
mineral
Greenschist (Chlorite Schist)
Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)
metamorphic
Chert (Cherty Limestone / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Agate
Banded Chalcedony (SiO2 - Silicon Dioxide)
mineral
Quartzite cobblestone
Quartzite (primarily SiO2)
metamorphic
Diamond
Diamond (Pure Carbon - C)
mineral
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Chalcedony (Agate/Quartz variety)
Cryptocrystalline Quartz (SiO2)
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone (Iron-potassium phyllosilicate mineral: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Chert (Iron-stained)
Chert (Silicon Dioxide, SiO2)
sedimentary
Ferruginous Sandstone (Gerrit)
Arenite with Iron Oxide cementation
sedimentary
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Kaolinite Claystone
Al2Si2O5(OH)4 (Kaolinite)
sedimentary
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral