Mineral, Sediment

Polished orbicular jasper

Jasper, a microcrystalline variety of quartz (SiO₂), colored by iron oxides and other accessory minerals

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Fossilized Shark Tooth

Scapanorhynchus (Sand Tiger Shark relative)

Iron-rich concretion or weathered ironstone

Goethite–hematite limonite aggregate; commonly described as limonite or ironstone

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Staurolite-bearing mica schist (probable)

Mica schist composed chiefly of muscovite/biotite, quartz, and likely staurolite or garnet

Biotite-rich mica schist

Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with probable quartz and feldspar

Petrified Wood

Silicified Wood (SiO2)

Chert / Fossilized Burrow Cast

Microcrystalline Quartz (SiO2) with Trace Carbonates

Weathered iron-rich rock, possibly limonite-bearing sandstone or laterite

Limonite/goethite-rich ferruginous rock; exact identification requires testing

Shungite

Non-crystalline carbon (Fullerene-bearing)

Green Jasper Pebble

Microcrystalline Quartz (SiO2) with impurities

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) in Carbonate Matrix

Petrified Wood

Silicified Wood (SiO2)

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Jasper Pendant

Silicon dioxide (SiO2) with impurities

Ruby Zoisite

Anyolite (Composition of Green Zoisite, Black Tschermakite, and Red Corundum)

Gastropod Fossil (Snail Steinkern)

Class Gastropoda fossil, composed of Calcium Carbonate (CaCO3)

Rounded river cobble, likely weathered sandstone or siltstone

Quartz-rich clastic sedimentary rock; exact identification requires a fresh surface and testing

Chert / Quartz Pebble

Microcrystalline Quartz (SiO2)

Chert (Arrowhead Point)

Microcrystalline Quartz (SiO2)

Chert Nodule in Limestone

Microcrystalline Quartz (SiO2)

Polished multicolored jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron- and manganese-stained chert

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Amber

Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)

Rounded granitic cobble

Granite or granitic gneiss; primarily quartz, feldspar, and mica

Brecciated stone pebble

Breccia

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Megalodon Shark Tooth (Partial Fossil)

Otodus megalodon (fossilized in Calcium Phosphate/Apatite)

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

Picture Jasper

SiO2 (Microcrystalline Quartz / Chalcedony with iron oxide impurities)

Petrified Wood

Silicified Wood / Xylopal (SiO2)

Tumbled jasper, likely red/brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Gold Flake / Placer Gold

Native Gold (Au)

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

Iron-rich quartzite or weathered ironstone pebble

Quartzite, chiefly SiO₂, with iron-oxide minerals (hematite/goethite)

Chalcedony in Matrix (likely Agatized Coral or Chert)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicate Mineral - SiO2)

Petrified Wood

Silicified Wood (SiO2)

Coprolite

Fossilized Feces