Sandstone Pebble
Arenite (Siliclastic sedimentary rock)
sedimentary
Category
Sedimentary Or Mineral
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Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
sedimentary
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Sandstone (likely Arkosic)
Arenite (SiO2 based)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Rough Quartz (Alluvial Pebbles)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone (with Iron Staining)
Arenite (Silicon Dioxide, SiO2, often with iron oxides like Limonite)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Satin Spar Selenite
Fibrous Gypsum (CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Sandstone (Ferruginous)
Arenite (Fe-oxide enriched)
sedimentary
Sandstone
Clastic sedimentary rock (SiO2 primary)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Geode (Unopened)
Silica-rich Concretion (primarily SiO2)
sedimentary
Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Limonite (Iron Ore)
Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)
mineral
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) within a nodule
sedimentary
Limonite Concretion
Goethite-rich Concretion (FeO(OH))
sedimentary
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Fluorite Geode
Calcium Fluoride (CaF2)
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Green Chalcedony
Silicon Dioxide (SiO2) with trace minerals
mineral
Sandstone
Sandstone (SiO2-dominated clastic rock)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite
sedimentary
Limonite with Iron Inclusions
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
sedimentary