Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Banded Calcite (often sold as 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Satin Spar (Selenite)
Gypsum (CaSO4·2H2O)
mineral
River Pebble (Likely Quartzite or Chalcedony)
Silicon Dioxide (SiO2) - granular metamorphic variety
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock
igneous
Diamond
Native Carbon (C)
mineral
Chalcedony (Botryoidal/Drusy Quartz)
Silicon Dioxide (SiO₂)
Mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Diamond (Princess Cut Faceted Gemstone)
Native Carbon (C)
mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Al2O3)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Basalt with minor mineral crusting
Sideromelane / Extrusive Igneous Rock
igneous
Chert (Flint)
Chert (SiO2)
sedimentary
Marble
Metamorphosed Limestone (calcite formulation CaCO3)
metamorphic
Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Diamond (Faceted)
Carbon (C)
mineral
Quartz with Mica (Micaceous Quartz)
Silicon Dioxide (SiO2) with Phyllosilicates
igneous/metamorphic
Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
Sodalite
Sodalite - Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Milky Quartz (Beach Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Raw Emerald
Beryl (Be3Al2(SiO3)6) with Cr/V impurities
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Agate (specifically a Thunderegg/Agate Nodule)
Cryptocrystalline Quartz (SiO2)
mineral
Green Moonstone (Garnierite)
Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)
mineral
Coal (likely Bituminous or Lignite)
Organic Sedimentary Rock (Carbonaceous)
sedimentary
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Silver (Native Silver)
Native Silver (Ag)
mineral
Hag Stone
Flint / Chert / Limestone concretion with a natural hole
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Diamond
Carbon (C)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral