Not A Rock (Man Made Industrial Metal)

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

Basalt

Basalt (comprising plagioclase, pyroxene, and olivine)

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Sandstone (Ferruginous)

Arenite (Fe2O3 enriched)

Basalt River Cobble

Basalt (Mafic Igneous Rock)

Vesicular Basalt (River Rock)

Afanitic Vesicular Basalt

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Basalt

Mafic Igneous Rock

Basalt

Extrusive mafic igneous rock

Amethyst (variety of Quartz)

SiO2 (Silicon Dioxide) with trace iron impurities

Seraphinite

Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.

Agate Geode

Chalcedony (SiO2 - Silicon Dioxide)

Basalt River Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Magnetite (potentially Hematite-rich)

Magnetite (Fe3O4)

Orange Calcite

Calcite (CaCO3)

Sandstone

Arenite (primarily SiO2)

Schist

N/A (a rock type, not a mineral formula)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Calcite

Calcite (CaCO3)

Blue Apatite

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

Banded Iron Formation

Banded Iron Formation (BIF)

Chert (Yellow Jasper variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Banded Gneiss (River Rock/Pebble)

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

Fluorite (likely Fluorite on Quartz/Matrix)

Calcium Fluoride (CaF2)

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Crushed Rock (Basalt)

Basalt (Aphanitic Mafic Igneous Rock)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Red Sandstone

Arenite (with Iron Oxide / Hematite staining)

Sandstone

Arenite

Basalt (River Stone)

Basalt

Granite River Rock

Phaneritic Felsic Igneous Rock (Granite)

Basalt

Basalt

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Agate (Dyed High-Grade Polished Slice)

Silicon dioxide (SiO2), Chalcedony crystal variety

Basalt River Stone

Basalt

Peridot

Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.