Pink Granite (River Pebble)
Felsic intrusive igneous rock (consisting of Quartz, Orthoclase Feldspar, and Plagioclase)
igneous
Category
Sedimentary (Man Made)
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Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granitoid
igneous
Likely basalt or vesicular volcanic rock
Basalt, possibly scoriaceous basalt; exact identification is uncertain from the photograph
igneous
Granite
Granite (felsic intrusive igneous rock)
igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite
Course-grained intrusive igneous rock
igneous
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Red Jasper
Silicon Dioxide (SiO2) with hematite inclusions
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Sandstone (clastic sedimentary rock, mainly SiO2 with iron oxide cement)
sedimentary
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Clastic Sedimentary Rock (Sandstone with Iron Oxide cement)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite (in matrix)
Rhodonite (Mn,Fe,Mg,Ca)SiO3
Mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Halite
Halite (Sodium Chloride, NaCl)
mineral
Halite
Halite (NaCl)
mineral
Copper and Quartz beads
Native Copper (Cu) and Crystalline Quartz (SiO2)
mineral
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Bituminous Coal
Coal (Sedimentary Rock)
sedimentary
Scallop Shell Fossil
Pecten sp.
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Honey calcite crystal
Calcite (calcium carbonate, CaCO₃)
mineral
Tumbled milky quartz pebble
Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety
mineral
Quartz-rich rock, likely chert or chalcedony
Microcrystalline silica (SiO₂), possibly quartz/chalcedony
mineral
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist; principally muscovite mica, biotite, quartz, and feldspar
metamorphic
Red jasper (likely rough jasper/chert)
Microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Banded calcite/aragonite mineral specimen (tentative)
Calcite (CaCO₃), possibly with aragonite or crystalline carbonate growth
mineral