Mineral, Often A Rock Given Its Aggregate Nature

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chrysocolla

Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

River Cobble (Basaltic/Andesitic)

Mafic Igneous Porphyritic Rock

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Fluorite (Rainbow Fluorite Tower)

Fluorite (Calcium Fluoride, CaF2)

Limestone

Calcium Carbonate (CaCO3)

Gold Nugget

Native Gold (Au)

Yellow Jasper (Iron-stained Quartz)

Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Gold Mineral

Native Gold (Au)

Quartz

Silicon Dioxide (SiO2)

Basalt with Scoria

Amygdaloidal Basalt / Vesicular Basalt

Milky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Granite

Phaneritic Plutonic Felsic Rock

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Pumice

Pumice (volcanic rock)

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Bull Quartz

Quartz (Silicon Dioxide - SiO2)

Black Jasper

Jasper (Silicon Dioxide, SiO2)

Yellow Quartzite (Beach Pebble)

Quartzite (primarily SiO2)

Pink Tumbled Agate (Dyed)

Silicon Dioxide (SiO2) with artificial dyes

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Native Copper within Host Rock

Native Copper (Cu)

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Banded Gneiss (River Rock/Pebble)

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

Rose Quartz

Rose Quartz (SiO₂)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Basalt

Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Green Apophyllite and Stilbite on Quartz Cluster

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

Granite

Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)