Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Fossilized Brachiopod
Brachiopoda (Phylum)
fossil
Basalt
Basalt
igneous
Diamond
Natural Diamond (Carbon, C)
mineral
Chert (Jasper/Limonitic Chert)
Cryptocrystalline Quartz (SiO2) with Iron Oxide (FeO(OH)) inclusions
sedimentary
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
sedimentary
Greenstone (Epidosite)
Epidosite (Metamorphosed Basalt/Diabase)
metamorphic
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Sandstone
Arenite (predominantly SiO2)
sedimentary
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) containing Iron Oxide inclusions
sedimentary
Diabase
Diabase (also known as Dolerite)
igneous
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Tumbled greenish jasper
Jasper, microcrystalline quartz (SiO₂) with iron-bearing and clay-mineral impurities
metamorphic
Sandstone
Arenite
sedimentary
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Quartz-rich rock with chlorite/epidote vein
Milky quartz with green chlorite or epidote; exact identification requires testing
metamorphic
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Seashell Fossil
Gastropoda fossil
fossil
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Quartz / Calcite Pebble
SiO2 (Quartz) or CaCO3 (Calcite)
mineral
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Tumbled yellow quartz (likely citrine or iron-stained quartz)
Quartz, SiO₂; yellow color from trace iron or irradiation/heat-related coloration
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Weathered iron-rich concretion or laterite fragment
Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix
sedimentary