Metamorphic Rock (Primarily Composed Of Minerals)

Blue Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)

Graphite

Graphite (Carbon, C)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Conglomerate

Conglomerate (Clastic sedimentary rock)

Tiger's Eye (likely Hawk's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)

Diorite

Diorite (an intrusive igneous rock)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Quartzite

Quartzite (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)

Unakite

Unakite (Epidotized Granite)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Blue Apatite

Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartzite River Rock

Quartzite (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Ferruginous Quartzite (Iron-stained Quartzite)

Quartzite with Iron oxides (FeO(OH) / Fe2O3)

Unakite

Unakite (Epidote-Feldspar rock)

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Quartz Geode

Crystalline Silicon Dioxide (SiO2) within a nodule

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Banded Iron Formation (BIF) / Iron Ore

Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Amygdaloidal Rhyolite

Amygdaloidal felsic extrusive rock

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Granite Pebble

Granite (Phaneritic Acidic Igneous Rock)

Vesicular Basalt with Lichen

Vesicular Basalt

Limonite (Iron Stone)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Diorite

Diorite (Intermediate Plutonic Rock)

Diamond

Diamond (C)

Pink Granite

Phaneritic plutonic rock (dominated by Alkali Feldspar)

Septarian Nodule (Septarian Dragon Stone)

Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)

Iron-stained Quartzite

Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)