Sedimentary Rock Or Mineral (Depending On Origin And Purity)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

Iceland Spar (Optical Calcite)

Calcite (Calcium Carbonate, CaCO3)

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Quartz (Smoky/Milky variety with inclusion)

Silicon Dioxide (SiO2)

Granodiorite Pebble

Granodiorite

Diamond

Natural Carbon (C)

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Sandstone

Arenite (SiO2 based)

Gold Nugget

Native Gold (Au)

Aragonite (Botryoidal/Coralloidal variety)

Aragonite (CaCO3)

Gold Nugget

Native Gold (Au)

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Fluorite

Calcium Fluoride (CaF2)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartz-rich)

Arenite (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 impurities)

Jet

Lignite (Anthracite-grade compact coal)

Fluorite (translucent octahedral crystal)

Calcium fluoride (CaF2)

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (primarily SiO2 with Feldspar)

Gold Nugget

Native Gold (Au)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Quartz (Drusy/Crystalline variety)

Silicon Dioxide (SiO2)

Green Fluorite

Fluorite (Calcium Fluoride) - CaF2

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Ruby and Diamond Heart Pendant

Corundum (Al2O3) and Diamond (C)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Diamond

Diamond (Pure Carbon, C)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Fluorite, Turquoise, and Calcite set

Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)

Sandstone

Arenite (primarily SiO2)

Stromatolite

Laminated biogenic sedimentary structure (formed by Cyanobacteria)

Yellow Calcite

Calcium Carbonate (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

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