This Is Not A Rock Or Mineral

Biotite Schist

Biotite Schist

Chert Breccia (Yellow Jasper)

Silicon Dioxide (SiO2) - Brecciated Chert

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions

Granite

Granite (Felsic Plutonic Rock)

Sandstone with Quartz Veins

Arenite (primarily SiO2 with Fe2O3 staining)

Druzy Quartz Geode (Oco or Moroccan variety)

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chrysocolla and Azurite in Matrix

Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)

Tiger's Eye (Mineral Collection)

Tiger's Eye (SiO2 with crocidolite inclusions)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Granite (Specimen: Logan Rock)

Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)

Banded Gneiss

Gneiss (Metamorphic Rock)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Bauxite / Iron-rich Laterite

Laterite (principally Al(OH)3, Fe2O3, and SiO2)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

Basalt Porphyry

Porphyritic Basalt

Granite

Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)

Sandstone (with Limonite staining)

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

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)

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]

Granite

Phaneritic Plutonic Felsic Rock

Sandstone (with possibly iron oxides and other minerals)

Sandstone

Sandstone

Sandstone (various mineral compositions)

Sandstone or Limestone

Arenite or Calcareous Sedimentary Rock

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains

Quartzite River Rock

Quartzite (primarily SiO2)

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Quartz (Druzy)

Silicon Dioxide (SiO2)

Shale

Clastic sedimentary rock (primarily clay and silt minerals)

Shale

Laminated Mudstone

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

Gneiss

High-grade metamorphic rock (Gneiss)