Sedimentary Rock (Possibly Composed Of Various Minerals)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Rough Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Wonderstone (Sandstone)

Liesegang Banded Sandstone (SiO2 dominated)

Blue Chalcedony

Chalcedony (SiO2)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Yellow Calcite

Calcium Carbonate (CaCO3)

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

Jasper Quarzite (possibly Lake Superior Agate mix)

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Geode (Quartz)

Silicon Dioxide (SiO2)

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Quartz

Quartz (SiO₂)

Red Sandstone

Sandstone (mainly SiO2 with Iron Oxide cement)

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Iron Meteorite

Iron-nickel alloy (primarily kamacite and taenite)

River Jasper (Chert/Chalcedony mix)

Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Schist

Chlorite/Mica Schist

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH) (Calcium phosphate with Fluorine, Chlorine, or Hydroxyl)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Turquoise

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

Chert / Flint Conglomerate

Silicified Sedimentary Breccia (primarily SiO2)

Banded Jasper (Chert)

Silicon Dioxide (SiO2) - variety of Chalcedony

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Pyrite

Iron Pyrite (FeS2)

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Blue Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Rough Green Calcite

Calcite (Calcium Carbonate, CaCO3)

Jasper

Chalcedony (cryptocrystalline quartz), SiO2

Fluorite

Calcium Fluoride (CaF2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic Rock)

Gneiss

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Turquoise

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

Wonderstone (Banded Rhyolite)

Rhyolite (Silicon Dioxide with Iron Oxide impurities)