Sedimentary (Alluvial Deposit)

Quartz Druzy Geode

Silicon Dioxide (SiO2) - Crystalline Variety

Pyrite

Iron Sulfide (FeS2)

Quartz Geode (Nodule)

Silicon Dioxide (SiO2)

Included Quartz Beads (likely Phantom Quartz or Garden Quartz)

Quartz (SiO2) with various mineral inclusions

Amber

Fossilized tree resin (not a true mineral as it is organic and amorphous); Chemical formula is highly variable, but often approximated as C10H16O.

Pyrite

Iron Disulfide (FeS2)

Jasper River Pebble

Silicon Dioxide (SiO2)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Anthracite Coal

Coal (predominantly carbon)

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Coal (most likely Bituminous or Anthracite)

Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)

Petoskey Stone

Hexagonaria percarinata (Fossilized colonial coral)

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Red Siltstone (or Red Shale)

Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Pink Opal / Peruvian Opal

Hydrated amorphous silicon dioxide (SiO2·nH2O)

Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

River Stone (likely Basalt or Chert)

Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Hematite

Iron(III) oxide (Fe2O3)

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Diamond

Diamond (pure carbon, C)

Banded Iron Formation

Banded Iron Formation (BIF)

Red Jasper (with Quartz Veins)

Jasper (var. chert, SiO₂)

Dolomite

Dolomite (CaMg(CO3)2)

Apatite

Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))

Greywacke (likely)

Greywacke (a type of sandstone)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Titanium Coated Kyanite (Aura Kyanite)

Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating

River Rock (Basalt/Greywacke pebbles)

Fluvial gravel primarily composed of Mafic Volcanic Rock (Basalt) or Lithic Sandstone (Greywacke)

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

Red Jasper

Jasper (Silicon Dioxide with Iron inclusions - SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony)

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Turquoise

Hydrated phosphate of copper and aluminum; CuAl6(PO4)4(OH)8·4H2O

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)