Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Native Copper in Basalt
Cu-element in Mafic Volcanic Rock (Basalt)
igneous
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Scoria
Scoria (vesicular basalt-andesite)
igneous
Diamond (or Lab-Grown Cubic Zirconia)
Carbon (C)
mineral
Blue Crackle Quartz (Dyed Fire Agate/Quartz)
Silicon Dioxide (SiO2) with artificial dye treatment
mineral
Smoky Quartz (Rough)
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Crystalline Silicon Dioxide (SiO2)
mineral
Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Porphyritic Basalt (likely artificially dyed or altered)
Basalt with plagioclase phenocrysts (likely treated)
igneous
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
mineraloid
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Milky Quartz (Ferruginous)
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite
Granite (with coarse-grained Quartz, Feldspar, and Mica components)
igneous
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Ruby (Raw Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Garnet in Matrix (Schist or Quartz)
Almandine Garnet, Fe3Al2(SiO4)3
metamorphic
Vesicular Basalt (or Scoria)
Extrusive mafic igneous rock
igneous
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Leland Blue Stone
Anthropogenic Iron Smelting Slag
mineraloid
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
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N/A
Anthracite Coal
Anthracite
metamorphic
Lava Rock (Basaltic Scoria)
Vesicular Basalt
igneous
Vanadinite on Matrix
Vanadinite (Pb5(VO4)3Cl)
mineral
Concrete rubble
Anthropogenic conglomerate
sedimentary
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary
Blue Sapphire
Corundum (Al2O3)
gemstone
Pegmatite (Granitic)
Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)
igneous
Pegmatite (Granitic)
Granitic Pegmatite
igneous
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 + Au)
metamorphic
Garnet
Almandine/Pyrope Garnet (Silicate Mineral Group)
mineral
Slate
Foliated Metamorphic Rock
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone or Mudstone
Sedimentary Rock
sedimentary
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Kimberlite with Diamonds
Kimberlite (ultramafic potassic igneous rock)
igneous
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Quartz Pebble (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral