Limestone
Sedimentary Calcite (CaCO3)
sedimentary
Category
Not A Rock
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Wishing Stone (Basalt with Quartz Vein)
Basalt containing a microcrystalline quartz (SiO2) or calcite vein
igneous
Stony-Iron Meteorite (likely Mesosiderite or Ordinary Chondrite)
Meteorite (Silicate-Metal Matrix)
meteorite
Unidentifiable Specimen
Undetermined
Unknown
Basalt
Mafic Volcanic Rock (Primarily Plagioclase feldspar and Pyroxene)
Igneous
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Water-worn Pebble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Basalt
Mafic extrusive igneous rock
igneous
Basalt
Extrusive mafic igneous rock
igneous
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Chrysocolla (on host rock)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Copper silicate)
mineral
Conglomerate
Conglomeratic Sandstone
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar-Biotite rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
River Rocks (Polished River Pebbles)
Stream-rounded clastic sediments
Mixed (Sedimentary, Igneous, and Metamorphic)
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Sandstone
Hydrothermal Quartz (SiO2) in Arenite
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode
mineral
Glauconitic Sandstone
Glauconitic Sandstane (containing K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Auriferous Quartz or Pyritic Ore
Iron Pyrite (FeS2) or Native Gold (Au) in Matrix
mineral
Quartzite with Chlorite
Metamorphic Quartzite (SiO2) with phyllosilicates
metamorphic
Limestone with Calcite
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
River Pebbles (Tumbled Quartz and Basalt)
Silicon Dioxide (SiO2) for white quartz; Mafic Volcanic Rock for basalt
igneous and sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Shale with Coprolite influence
Argillaceous sedimentary rock (Shale/Mudstone)
sedimentary
Quartzite (specifically a river-worn pebble)
Quartzite (primarily SiO2)
metamorphic
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Quartzite with Quartz Vein
Metamorphosed sandstone (SiO2)
metamorphic
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Gneiss (Metamorphosed Pebble)
Gneiss with Quartz/Feldspar banding
metamorphic
Garnet Schist
Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Eclogite
Eclogite (Omphacite-Garnet Metamorphic Rock)
metamorphic