Mineral On Sedimentary

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Chalcedony (Common Opal variant)

Silicon dioxide (SiO2) with microcrystalline structure

Hematite

Iron(III) oxide (Fe2O3)

Green Calcite

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Conglomerate

Clastic Sedimentary Conglomerate (SiO2, CaCO3, etc.)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Garnet-Bearing Gneiss

Almandine-Garnet Gneiss

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Limonite Pseudomorph after Pyrite

Limonite (Hydrous iron oxides, FeO(OH)·nH2O) replacing Pyrite (FeS2)

Conglomerate

Conglomerate rock

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (Gritstone)

Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)

Fossilized Shark Tooth

Scapanorhynchus (Sand Tiger Shark relative)

Amber

Succinite (Resin C10H16O)

Clear Quartz

Silicon Dioxide (SiO2)

Red Jasper

Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)

Jasper

Quartz (SiO2) with impurities

Jasper

Silicon Dioxide (SiO2)

Gastropod Fossil (Snail Stone or Steinkern)

Class Gastropoda (Calcium Carbonate - CaCO3 / Silica - SiO2 replacing original shell)

Flint (Chert Node)

Silicon Dioxide (SiO2)

Dragon Stone

Argillaceous Sedimentary Rock (Ohko Stone)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)

Epidote

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Wishing Stone (Basalt or Mudstone with Quartz/Calcite Veins)

Hydrothermally veined Basalt (SiO2/CaCO3 intrusions)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Flint Nodular)

Chert (Silicon dioxide, SiO2)

Siltstone with Weathering Rind

Siltstone (composed of microscopic quartz and clay minerals)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Microcrystalline quartz (SiO2) with Hematite (Fe2O3) impurities

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Agate (specifically Waterline or Onyx-type Agate)

Silicon Dioxide (SiO2) - variety Chalcedony

Calcite

Calcite (CaCO3)

Siltstone

Siltstone (primarily composed of quartz and clay minerals)

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)