Limestone
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock)
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Unidentified dark pebble
Unknown
rock
Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Diamond
Carbon (C)
gemstone
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Intrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Sandstone
Arenite (SiO2 dominant)
sedimentary
Weathered fossiliferous limestone fragment, possibly fossil coral or shell material
Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone
fossil
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
sedimentary
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
igneous/metamorphic
Engineerged Quartz (Quartz Composite)
SiO2 (Silicon Dioxide) in a polymer resin matrix
mineral
Limestone (specifically Crushed Limestone/Calcictic)
Calcium Carbonate (CaCO3)
sedimentary
Acrylic or Resin (Synthetic Imitation)
Polymethyl Methacrylate (PMMA) or Polyepoxide
Synthetic/Man-made Polymer
Ruby in Zoisite
Anyolite (composite of Corundum and Zoisite)
metamorphic
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Basalt
Extrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Mafic extrusive igneous rock
igneous
Basalt Cobble
Vesicular Basalt (Mafic Extrusive)
igneous
Granodiorite
Granodiorite
igneous
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
metamorphic
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Likely petrified wood or silicified fossil fragment
Silicified wood; predominantly microcrystalline quartz (SiO₂)
fossil
Polished fossilized wood (likely petrified wood)
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Tumbled sodalite (probable)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Garnet
Nesosilicate group (e.g., Almandine: Fe3Al2(SiO4)3)
mineral
Anthracite
Anthracite Coal (Carbon)
sedimentary
Sapphire
Corundum (Al2O3)
gemstone
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Pegmatite
Igneous Pegmatite
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Sapphire
Corundum (Al2O3)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Yellow Sapphire
Corundum (Al2O3)
gemstone
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Garnet (Tumbled)
Almandine / Pyrope Garnet (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral