Mineral, Often Found As A Rock

Gneiss

Gneiss (High-grade metamorphic rock)

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Serpentine

Serpentinite (group of minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt

Extrusive Mafic Igneous Rock

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Chert (Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Travertine

Calcareous Tufa (CaCO3)

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Specular Hematite

Specularite (Fe2O3)

Sandstone

Arenite (SiO2 based with mineral cement)

Yellow Jasper

Silicon Dioxide (SiO2) with Ferric Hydroxide impurities

Vesicular Basalt with Lichen

Vesicular Basalt

Quartz Pebble

Silicon Dioxide (SiO2)

Aventurine

Quartz (Aventurine variety)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Blue Quartz

Quartz (SiO2) with inclusions

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Geode (Quartz)

Silicon Dioxide (SiO2)

Chert (White Variety)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)

Golden Healer Quartz

Ferruginous Quartz (SiO2 with Fe2O3 inclusions)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Quartzite River Rock

Quartzite (primarily SiO2)

Gold Nugget

Native Gold (Au)

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Limonite (Iron Ore)

Limonite (̑FeO(OH)·nH₂O)

Sandstone (with Iron Oxide)

Arenite with Limonite/Hematite staining

Blue Kyanite

Kyanite (Al2SiO5)

Amethyst Geode

Silicon Dioxide (SiO2) - Amethyst variety of Quartz

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2) - variety of Chalcedony

Blue Calcite

Calcium Carbonate (CaCO3)