Man Made Object (Coin)

Red Jasper (nodule)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Sandstone

Arenite (primarily SiO2)

Schist

Mica Schist (Quartz-Muscovite-Biotite Schist)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (variable SiO2 with Fe2O3 staining)

Limestone

Calcium Carbonate (CaCO3)

Serpentine

Serpentine Group (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Porphyritic Basalt

Basalt (with plagioclase phenocrysts)

Sandstone

Arenite (primarily SiO2)

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Galena

Lead(II) sulfide (PbS)

Crystal Quartz Beads (likely Clear Quartz)

Quartz (SiO₂)

Botryoidal Chalcedony

Chalcedony (SiO2)

Sandstone (Pebble/Cobble)

Arenite (primarily SiO2)

Smoky Quartz

Silicon Dioxide (SiO₂)

Quartz (Common Milky Quartz)

Silicon Dioxide (SiO2)

Red Jasper (River Pebble)

Jasper (Silicon Dioxide, SiO2)

Fluorite

Calcium Fluoride (CaF2)

Red Quartzite River Pebble

Quartzite (SiO2 with iron oxide inclusions)

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

Marble

Metamorphosed Limestone (calcite formulation CaCO3)

Blue Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Burmese Jadeite (Water Jade)

Jadeite (NaAlSi2O6)

Sandstone (Red Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)

Porphyritic Basalt (with Lath-like Phenocrysts)

Porphyritic Basalt

Plagioclase Feldspar

Plagioclase Feldspar Series (NaAlSi3O8 - CaAl2Si2O8)

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

Jasper (likely Ocean Jasper or Variegated Jasper)

Silicon Dioxide (SiO2) with impurities

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Ironstone Concretion / Limonite Node

Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (with Goethite/Limonite cement)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Green Fluorite

Calcium Fluoride (CaF2)