Sedimentary Rock (Possibly Composed Of Various Minerals)

Chert (Green variety)

Microcrystalline Opaline/Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Jasper

Silicon dioxide (SiO2)

Chert (with Limestone matrix)

Microcrystalline Quartz (SiO2)

Granatic Pegmatite

Pegmatitic Granite

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

Red Jasper

Microcrystalline Quartz (SiO2) with Hematite impurities

Basalt

Extrusive Mafic Igneous Rock (composed primarily of Plagioclase, Pyroxene, and Olivine)

Sandstone (Quartz-rich)

Arenite (SiO2)

Scoria (Lava Rock)

Mafic Volcanic Scoria

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granitic Pegmatite (River Rock specimen)

Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)

Chert (varieties include Flint or Jasper)

Chert (cryptocrystalline quartz; SiO₂)

Unakite

Unakite (altered granitic rock)

Graphite

Graphite (Carbon, C)

Granodiorite

Granodiorite (calc-alkaline phaneritic igneous rock)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite and Quartz inclusions

Snowflake Obsidian (or similar porphyritic volcanic rock)

Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)

Granitic Pegmatite

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

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

Unakite (Tumbled)

Epidotized Granite

Quartz

Quartz (SiO₂)

Shale with Siltstone layering

Sedimentary Clastic Rock (Mudstone/Shale)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Calcite

Calcium Carbonate (CaCO3)

Coquina

Coquina (Biogenic Limestone / CaCO3)

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)

Anhydrite (Calcium Sulfate, CaSO4)

Sandstone (Banded Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Moonstone

Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8

Vesicular Basalt

Extrusive Mafic Igneous Rock (composed of Plagioclase feldspar, Pyroxene, and Olivine)

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase Feldspar)

Fossilized Shark Tooth in Matrix

Otodus sp. (likely Otodus obliquus)

Ironstone Concretion (Limonite/Goethite)

Ironstone (primarily FeO(OH)·nH2O)

Ironstone Concretion (Moqui Marble type)

Ferruginous Concretion (Fe2O3 / FeO(OH))

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz