Not A Rock Or Mineral

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Turquoise

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

Sandstone

Arenite (SiO2 primarily)

Granite

Phaneritic Plutonic Felsic Rock

Shale

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

Glauconite (Glauconitic Sandstone)

Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]

Sandstone (with possibly iron oxides and other minerals)

Sandstone

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains

Sandstone

Sandstone (various mineral compositions)

Sandstone or Limestone

Arenite or Calcareous Sedimentary Rock

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Quartzite River Rock

Quartzite (primarily SiO2)

Shale

Laminated Mudstone

Quartz (Druzy)

Silicon Dioxide (SiO2)

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Banded Agate (Polished Slice)

Chalcedony (cryptocrystalline Quartz), SiO2

Drill Core Samples (Varied Lithology)

Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)

Gneiss

High-grade metamorphic rock (Gneiss)

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Quartz Geode

Silicon Dioxide (SiO2)

Tiger's Eye (Brown/Dark variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Vesicular Basalt (or Scoria)

Vesicular Basalt (Aphanitic-vesicular volcanic rock)

Agate

Agate (Silicon Dioxide, SiO2)

Basalt with Scoria

Amygdaloidal Basalt / Vesicular Basalt

Sandstone (Banded)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Unidentified Rock Fragment

Unknown

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Garnet Schist

Almandine-Muscovite Schist

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2) and Slate/Shale

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))