Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)

Chert / Flint Nodular Fragment

Microcrystalline quartz (SiO2)

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Brecciated jasper, possibly rainforest jasper or brecciated rhyolite

Brecciated microcrystalline quartz (SiO₂), commonly called jasper; the green portions may contain epidote, chlorite, or iron-bearing silicates, while red-brown areas are typically hematite or other iron oxides

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Obsidian

Obsidian (volcanic glass)

Conglomerate

Sedimentary Conglomerate

Quartz Geode Cluster (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Dalmatian Stone (Dalmation Jasper)

Aplite with Arfvedsonite inclusions

Sandstone with Iron Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Iron-rich sandstone or laterite fragment

Ferruginous sandstone; possibly laterite/goethite-rich ironstone

Clear Quartz

Silicon dioxide (SiO2)

Rounded brown-gray stone, possibly weathered conglomerate or sandstone

Indeterminate clastic sedimentary rock; likely poorly cemented sandstone/conglomerate

Likely weathered brown quartz-bearing rock

Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph

Quartz

Silicon Dioxide (SiO₂)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Quartz on Sandstone

Silicon Dioxide (SiO2) in Lithic Sandstone

Druzzy Quartz on Matrix

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3)

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Chert (Yellow Jasper)

Silicon Dioxide (SiO2)

Limonite Concretion

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Sandstone Concretion

Ferruginous Sandstone Concretion

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Banded Sedimentary Rock (Siltstone/Mudstone with concretion)

Siltstone with Ferruginous Banding

Serpentine

Serpentine Group (Mg3Si2O5(OH)4)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Tumbled brown mineral pebble, possibly jasper or weathered quartzite

Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz

Clear Quartz

Silicon dioxide (SiO2)

Moqui Marry / Shaman Stone

Hematite-cemented Sandstone Concretion

Limonite (Ironstone Concretion)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Clear Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly amphibolite-bearing

Agate / Chalcedony Geode Nodule

Silicon Dioxide (SiO2)

Labradorite (likely Black Labradorite or Larvikite)

Labradorite (Na,Ca)(Al,Si)4O8. If a rock, it is typically anorthosite, gabbro, or norite, or a variety of syenite called Larvikite if it is specifically from Larvik, Norway.

Porphyry (specifically Porphyritic Rhyolite or Andesite)

Porphyritic Igneous Rock (composed of Phenocrysts in an Aphanitic groundmass)

Celestine (Celestite)

Strontium sulfate (SrSO4)

Sandstone (specifically Arkose or Siltstone variant)

Clastic Sedimentary Rock (primarily SiO2)

Weathered chert or jasper nodule

Microcrystalline quartz (SiO₂), likely chalcedony/jasper with iron-oxide staining