Mineral Or Sedimentary Rock (With Mineral Inclusions)

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Granite

Granite (felsic intrusive igneous rock)

Sandstone

Arenite (primarily SiO2)

Quartz (Drusy/Crystalline variety)

Silicon Dioxide (SiO2)

Carnelian Agate

Carnelian (Silicon Dioxide: SiO2)

Opal

Hydrated Silica (SiO2·nH2O)

Limestone

Calcium Carbonate (CaCO3)

White Opal (Common)

Hydrated Silica (SiO2·nH2O)

Gneiss

Gneiss

Strawberry Quartz

Quartz (SiO2) with inclusions of Goethite or Hematite

Limestone

Calcium Carbonate (CaCO3)

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Calamites (Fossilized Horsetail)

Calamites suckowii (Family: Calamitaceae)

Flower Agate (Cherry Blossom Agate)

Chalcedony (SiO2) with Opaque Inclusions

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Ferruginous Sandstone (with Iron Oxide staining)

Clastic Sedimentary Rock - Quartz Arenite/Wacke

Red Sandstone

Arenite (with Iron Oxide)

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Milky Quartz Cobble

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions - SiO2)

Sandstone (Ferruginous)

Arenite (with Hematite/Limonite cement)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Fossil Sand Dollar (Echinoidea)

Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)

Bumblebee Jasper

Calcite-Auripigment-Pyrite-Realgar assemblage (Carbonate/Sulphide mixture)

Banded Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartzite and Feldspar grains)

Chert (Jasper variation)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Sandstone (Weathered Coastal Boulder)

Arenite (composed primarily of SiO2)

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Red Sandstone (Iron-rich Sandstone)

Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement

Milky Quartz with Tourmaline and Iron Oxides

Silicon Dioxide (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (iron-rich)

Green Quartz / Aventurine

Silicon Dioxide (SiO2) with inclusions

Marble

Recrystallized Calcite Rock (CaCO3)

Milky Quartz with Mica

Silicon Dioxide (SiO2) with Muscovite Mica [KAl2(AlSi3O10)(OH)2]

Quartz (Common Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)