Mineral (Biogenic)

Granite Cobble

Felsic Intrusive Igneous Rock (Granite)

Smoky Quartz on Feldspar (Granite Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Granite

Granite (comprised primarily of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica (KAl2(AlSi3O10)(OH)2))

Diamond (or Lab-Grown Cubic Zirconia)

Carbon (C)

Milky Quartz with inclusions

Quartz (Silicon Dioxide, SiO2)

Quartzite

Quartzite (primarily SiO2)

Granite

Phaneritic plutonic rock (Felsic)

Sandstone Beach Pebble

Clastic sedimentary rock (SiO2 with iron oxide cement)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing mica)

Sandstone (River Cobble)

Clastic Sedimentary Rock (primarily Quartz with Feldspar)

Magnetic Hematite

Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)

Phantom Quartz with Chlorite and Hematite inclusions

Silicon Dioxide (SiO2) with inclusions of Chlorite group minerals and Hematite (Fe2O3)

Garnet

Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3

Granite

Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)

Gneiss

Gneiss

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Granite

Granite

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Megalodon Shark Tooth Fossil

Otodus megalodon

Aventurine (Green Quartz)

Quartz with Fuchsite inclusions (SiO2 with K(Al,Cr)2(AlSi3O10)(OH)2)

Granite

Granite (a plutonic rock)

Red Sandstone

Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)

Fossil Sand Dollar (Echinoidea)

Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Spinosaurid Dinosaur Tooth

Spinosaurus aegyptiacus (fossilized)

Spinosaurus Tooth

Spinosaurus aegyptiacus (fossilized in Hydroxyapatite)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granite (Micro-specimen)

Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Amygdaloidal Basalt with Agate/Chalcedony Infills

Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)

Schist (Diamond Drill Core)

Mica Schist

Pyrite

Iron Disulfide (FeS2)

Red Vanadinite on Matrix

Vanadinite (Pb5(VO4)3Cl)

Gneiss

Gneiss

Granite Cobble (River Stone)

Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)

Milky Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Granite

Phaneritic Felsic Igneous Rock (Granite)

Granite

Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)