Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Antropogenic (Man Made)
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Sandstone
Arenite
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Weathered pegmatite or feldspar-rich granite fragment
Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph
igneous
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite Pebble
Granite (Felsic Intrusive Igneous Rock)
igneous
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar)
igneous
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with iron oxide cement)
sedimentary
Polished basalt (vesicular basalt pebble)
Basalt, primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Scoria
Scoriaceous Basalt
igneous
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone (lithic)
Lithic Wacke / Arenite
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (also known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)
Sedimentary Rock
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Basalt (Water-worn Pebble)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Carnelian
Carnelian Chalcedony (SiO2)
mineral
Quartz-rich vein rock, likely milky quartz in weathered host rock
Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Granite (weathered)
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Granite (High-silica plutonic rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Quartzite (Iron-stained)
Quartzite (SiO2 with iron oxides)
metamorphic
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Weathered sandstone or granitic rock fragment
Likely quartz-rich sandstone; exact identification requires testing
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock