Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Limestone (specifically Chalky Limestone)

Calcium Carbonate (CaCO3 / Calcite)

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Granite

Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Conglomerate (Jasper Conglomerate)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Granitic Pegmatite

Pegmatitic Granite

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Granite

Granite (Felsic Plutonic Rock)

Diorite (Salt and Pepper Rock)

Diorite

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Schist

Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])

Pink Granite

Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

Mica Schist

Mica Schist (Composition typically includes Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Lapis Lazuli

Lapis lazuli (a metamorphic rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Not a rock, mineral, or geological specimen

Red Jasper

Jasper (Silica/Silicon Dioxide, SiO2 plus iron inclusions)

Jasper Conglomerate (Puddingstone)

Jasper Conglomerate (Siliceous Sedimentary Rock)

Granodiorite (Gneissic texture)

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Schist

Schist (various mineral compositions)

Lapis Lazuli

Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Basalt with Scoria

Amygdaloidal Basalt / Vesicular Basalt

Quartz (specifically Milky or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Basalt

Basalt (Mafic volcanic rock)

Granite

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

Granite

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

Granite

Granite (phaneritic felsic intrusive rock)

Hematite

Iron(III) oxide (Fe2O3)

Eclogite

Eclogite (Omphacite + Pyrope)

Blue Calcite

Calcite (CaCO3)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Fossiliferous Limestone with Brachiopod Mold

Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions

Tiger's Iron

Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)