Organic Materia (Not A Rock Or Mineral)

Diorite

Diorite (an intrusive igneous rock)

Quartz Druze (Crystalline Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (specifically Jasper/Flint pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Vesicular Basalt with Secondary Mineral Infill

Mafic Volcanic Rock (Basalt)

Granitic Pegmatite

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)

Granite with Mafic Inclusions

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)

Banded Chert

Microcrystalline Quartz (SiO2)

Gneiss (Metamorphic Rock)

Gneiss

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Pyrite in Shale

Iron Sulfide (FeS2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 principal)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Travertine

Calcareous tufa (CaCO3)

Graphite

Graphite (Native Carbon, C)

Basalt

Mafic Igneous Rock

Desert Rose

Gypsum (variety Selenite) - CaSO4·2H2O

Agatized Fossil or Chalcedony Nodule

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Turquoise

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

Green Moss Agate

Silicon Dioxide with inclusions (SiO2)

Travertine (often colloquially called Tufa)

Chemical Sedimentary Calcium Carbonate (CaCO3)

Banded Chert

Sedimentary Cryptocrystalline Quartz (SiO2)

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Sandstone

Arenite (primarily SiO2)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Coarse-grained Granite

Phaneritic Granite (contains Quartz, Feldspar, and Mica)

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Arrowhead Preform or Point)

Chert (Microcrystalline Quartz, SiO2)