Sedimentary (Man Made Conglomerate)

Limestone

Calcium Carbonate (CaCO3)

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3)

Microcrystalline Limestone

Limestone (CaCO3 with impurities)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Ferruginous Sandstone with Quartz Inclusions

Clastic Sedimentary Rock (Iron-rich Sandstone)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclasts

Sandstone

Arenite (SiO2 + various cementing minerals)

Limestone Pebble

Calcium Carbonate (CaCO3)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains)

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

Fossiliferous Limestone (Bivalve Fossil)

Calcium Carbonate (CaCO3) with Bivalvia fossil

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Sandstone Concretion

Clastic Sedimentary Rock - Quartz Arenite / Sandstone

Fluorite

Calcium Fluoride (CaF2)

Weathered granitic rock

Granite or granodiorite; mainly quartz, feldspar, and mica/amphibole

Crushed Limestone

Sedimentary Calcite/Dolomite Rock (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Gravel / Limestone Fragment

Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock

Banded gneiss pebble

Gneiss, chiefly quartz–feldspar–mica with dark biotite/amphibole bands

Flint

SiO2 (Microcrystalline Quartz / Chert)

Sandstone (Siltstone or Fine-grained)

Clastic sedimentary rock (primarily SiO2)

Glauconite (Greensand)

Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

Dalmatian Stone

Peralkaline rhyolite

Fossiliferous Limestone

Limestone with fossil bioclasts (Calcium Carbonate, CaCO3)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (composed mostly of SiO2)

Shale

Shale (composition varies: primarily clay minerals and quartz)

Quartzite

Quartzite (SiO2)

Sandstone with Iron Oxide

Arenite (SiO2 with Fe2O3 staining)

Chert (Jasper variation)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Sandstone (River Rock)

Arenite (SiO2 principal component)

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Sandstone

Arenite (primarily Quartz Sandstone)

Sandstone (with Arkose characteristics)

Clastic sedimentary rock (SiO2 with KAlSi3O8)

Banded Iron Formation (BIF) / Iron Ore

Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)

Sandstone (Greywacke)

Sandstone (SiO2 enriched with lithic fragments)

Celadonite in Basalt (Green Earth)

Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)

Limestone with Calcareous Accretion

Sedimentary Carbonate Rock (CaCO3)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Litharenite)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone

Arenite (Siliclastic Sedimentary Rock)

Quartz Geode

Silicon Dioxide (SiO2) in a sedimentary host