Mica Schist
Mica Schist (primarily muscovite and biotite)
metamorphic
Category
Not A Rock
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Unakite
Epidotized Granite
metamorphic
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
River Pebble (Sandstone)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Fossil Coral (Honeycomb Coral)
Favosites (extinct genus of Tabulate coral)
sedimentary
Pebble (river rock/beach pebble)
Pebble (clast size class)
Sedimentary Rock
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Sandstone
Sandstone (lithified sand)
sedimentary
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Diabase (Dolerite)
Diabase
igneous
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Limestone
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Limestone
Sedimentary Limestone (Calcium Carbonate, CaCO3)
sedimentary
Ferruginous Sandstone
Arenite with Hematite/Goethite cement
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite with Iron Inclusions
Metamorphic Quartzite (SiO2 with Fe2O3 trace impurities)
metamorphic
Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Eclogite
Eclogite (Pyrope garnet and Omphacite pyroxene)
metamorphic
Sandstone (likely Quartzose type)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
sedimentary
Limestone (specifically Iron-stained or Argillaceous Limestone)
Calcium Carbonate (CaCO3) with Iron Oxide (Fe2O3) impurities
sedimentary
Ocherous Sandstone (Ferruginous Sandstone)
Ferruginous Arenite (SiO2 with Fe2O3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
sedimentary
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Stream Pebble (Basalt/Greywacke)
Mafic Igneous Rock (Fine-grained)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)
sedimentary
River Stone / Pebble
Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)
Mineral, Sediment
Basalt River Stone
Aphanitic Basalt
igneous
Breciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Vesicular Basalt
Basalt with secondary mineral infilling (Amygdaloidal Basalt)
igneous
Basalt (River Pebble)
Basalt
igneous
Shungite
Non-crystalline carbon (similar to anthracite coal or meta-anthracite)
metamorphic
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary