Sedimentary Rock Or Mineral (Depending On Origin And Purity)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Druzy Geode

Silicon Dioxide (SiO2) - Crystalline Variety

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Indigo Gabbro

Gabbro (Mafic Intrusive Rock)

Quartzite

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Gneiss (likely)

Gneiss

Sandstone (Greywacke/Siltstone variant)

Arenite / Wacke (SiO2 with diverse mineral inclusions)

Shale

Fissile mudstone (Shale)

Sandstone

Arenite (primarily SiO2)

Calcite

Calcium Carbonate (CaCO3)

Granite

Granite (a common rock type, not a single mineral species)

Quartzite (Iron-stained)

Quartzite (primarily SiO2)

Limonite (Iron Ore)

Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)

Quartzite with Hematite staining

Quartzite (SiO2)

Chert (Flint)

SiO2 (predominantly microcrystalline or cryptocrystalline quartz)

Limonite (Iron Ore)

Goethite and related iron hydroxides (FeO(OH)·nH2O)

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Chert / Flint

Cryptocrystalline quartz (SiO2)

Nephrite Jade

Nephrite

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar

Quartzite (Rounded Pebble)

Quartzite (predominantly SiO2)

Sandstone

Arenite

Sandstone (Quartzose)

Arenite (primarily SiO2)

Moqui Marble (Moqui Ball)

Ironstone Concretion (Goethite/Hematite cemented Sandstone)

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Chert (Chert / Flint nodule)

Silicon Dioxide (SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Rose Quartz

Quartz (SiO₂), specifically a variety of Quartz

Serpentine

Serpentine Group Minerals (e.g., Antigorite, Chrysotile, Lizardite)

Dalmation Stone (often called Dalmatian Jasper)

Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite

Desert Varnish on Sandstone

Ferromanganese coating on Quartz Arenite

Turquoise (Rough)

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Black Jasper

Silicon Dioxide (SiO2) with inclusions

Sandstone

Arenite (SiO2 based)

Quartzite

Quartzite (primarily SiO2)

Chalcedony or Chert/Jasper with secondary mineral staining

SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.

Sandstone

Arenite

Quartzite Pebble

Quartzite (primarily SiO2)