Man Made Object (Metalwork)

Raw galena specimen

Galena (lead sulfide, PbS)

Coral Skeleton (Scleractinia)

Aragonite (CaCO3) biomineralisation within Anthozoa

Milky Quartz

Silicon Dioxide (SiO2)

Clear quartz crystal point

Quartz (silicon dioxide, SiO₂), likely a polished or cut crystal

Milky quartz (likely quartzite or massive quartz)

Quartz, silicon dioxide (SiO₂)

Pale green rough mineral specimen, likely serpentine or calcite

Probable serpentine-group mineral, Mg₃Si₂O₅(OH)₄; possibly pale-green calcite, CaCO₃

Shark Tooth Fossil

Otodus obliquus (or similar prehistoric lamniform shark tooth)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Red Sandstone

Arenite (with iron oxide cement)

Granite

Intrusive Igneous Rock

Granite Pebble

Intrusive Igneous Rock

Granite

Felsic intrusive igneous rock

Phyllite (possibly low-grade greenish slate)

Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula

Yellow Citrine Quartz

Silicon Dioxide (SiO₂)

Shale

Fissile mudstone (Shale)

Red Sandstone

Arenite (Ferruginous Sandstone)

Citrine

Silicon Dioxide (SiO2)

Yellow Quartz River Pebble

Silicon Dioxide (SiO2)

Porphyritic Andesite

Andesite (Intermediate Volcanic Rock)

River Quartz / Quartzite Pebbles

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite (River Pebble)

Quartzite (SiO2)

Galena-bearing ore (tentative)

Galena, lead sulfide (PbS), likely in a quartz/carbonate-rich matrix

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Glauconitic Sandstone

Glauconitic Quartz Arenite

Agate (Nodule/Chert)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Silica, SiO2)

Quartz-bearing iron-rich rock, possibly quartzite or hydrothermal breccia

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite; exact host rock is uncertain from the photograph

Lazulite

Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2

Polished brown mineral fragment, likely quartz-rich iron-stained material

Possibly quartz (SiO₂) with iron-oxide inclusions; exact identification is uncertain from the image

Quartz

Quartz (SiO2 - Silicon Dioxide)

Uncertain polymict breccia or altered volcanic rock

Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing

White Marble

Recrystallized Calcite (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Chert (Field Stone)

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Green Quartzite

Quartzite (SiO2)

Gabbro

Gabbro (Coarse-grained mafic intrusive igneous rock)

Quartz

Quartz (SiO₂)

Fossilized Shark Tooth

Chondrichthyes (class) fossilized tooth

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment