Sedimentary Rock (Possibly Composed Of Various Minerals)

Chert (Iron-stained)

Chert (primarily Microcrystalline Quartz, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Limonite (after Pyrite Pseudomorph)

Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)

Rose Quartz

Quartz (SiO2) with trace elements of titanium, iron, or manganese

Mica Schist

Mica Schist

Granite

Granite

River Pebble (Quartz-rich)

Silicon Dioxide (SiO2) with various inclusions

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Quartz

Silicon Dioxide (SiO₂)

Basalt

Basalt (Mafic volcanic rock)

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Amethyst (Rough Quartz)

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Picasso Stone

Metamorphosed Calcium Carbonate (Limestone)

Rose Quartz

Rose Quartz (SiO₂)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Vesicular Basalt

Basalt

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Red Sandstone (Siltstone/Mudstone variety)

Ferruginous Sandstone (composed primarily of Quartz with Hematite cementation)

Chalk

Calcareous Ooze (composed primarily of coccoliths)

Jasper

Jasper (Silica/Quartz) - SiO2

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Red Siltstone (or Red Shale)

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

Sandstone (Greywacke)

Arenite / Wacke (Mainly SiO2 with various lithic fragments)

Bumblebee Jasper

Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)

Quartz Druzy Geode

Silicon Dioxide (SiO2) - Crystalline Variety

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

Chert (Chert Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Gneiss

Gneiss

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Red Jasper (possibly Carnelian)

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Sandstone (likely Iron-rich or Arkosic)

Arenite (SiO2 with FeO(OH) or Fe2O3 staining)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Granite

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)