Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Category
Mineral (Impactite)
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Gneiss (Cobble)
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Limonite / Goethite Ironstone
FeO(OH)·nH2O (Hydrous iron oxide)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
metamorphic
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Banded Sandstone (River Cobble)
Arenite Sandstone with heavy mineral layering
sedimentary
Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
igneous
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Granite
Intrusive Igneous Rock (Felsic)
igneous
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Gold Mineral
Native Gold (Au)
mineral
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Granite
Intrusive igneous rock
igneous
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Milky Quartz with Mica Matrix
SiO2 (Silicon Dioxide) with Muscovite/Biotite mica
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Morganite and Aquamarine (Beryl) Bracelet
Beryllium aluminum silicate, Be3Al2(SiO3)6
gemstone
Bicolor Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)
FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)
mineral
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Quartz Mineral
Silicon dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH) (Calcium phosphate with Fluorine, Chlorine, or Hydroxyl)
mineral
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)
metamorphic
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Pegmatite
Igneous Pegmatite
igneous
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Fluorite (specifically Blue John or Banded Fluorite)
Calcium Fluoride (CaF2)
mineral