Sedimentary Rock (Possibly Composed Of Various Minerals)

Shale

Fissile mudrock (composed primarily of clay minerals and quartz)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Granite

Phaneritic Plutonic Felsic Rock

Granite Gneiss

Gneiss (derived from granitic protolith)

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Laterite

Laterite (no specific mineral formula as it's a rock type)

Chert (Jasper or Flint variant)

Chert (composed of microcrystalline quartz, SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (composed primarily of SiO2)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Gneiss (specifically Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)

Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color

Silicon Dioxide (SiO2), a variety of Chalcedony

Quartz on Sandstone

Silicon Dioxide (SiO2) in Lithic Sandstone

Sandstone

Sandstone (Clastic Sedimentary Rock)

Limestone

Sedimentary rock composed of Calcium Carbonate (CaCO3)

Amygdaloidal Basalt with Secondary Minerals

Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)

Red Sandstone

Arenite (Fe2O3 rich)

Red Sandstone

Arenite (high iron oxide content)

Bauxite

Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)

Marble

Recrystallized Calcite (CaCO3)

Smoky Quartz

SiO2 (Silicon Dioxide)

Quartz (beads)

SiO2 (Silicon Dioxide)

Unidentifiable Specimen

Undetermined

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Lapis Lazuli (Tumbled Specimen)

Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Conglomerate

Conglomerate (a clastic sedimentary rock)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartz

Quartz (SiO₂)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Rock Crystal Quartz

Quartz (SiO₂)

Ferruginous Sandstone (Gritstone)

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Celestine (Celestite)

Strontium Sulfate (SrSO4)

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

Ironstone (with possible Hematite/Limonite coating)

Ironstone (Fe-rich sedimentary rock)

Sandstone

Clastic sedimentary rock (primarily SiO2)

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.

Quartz (pebble)

Quartz (SiO₂)

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite