Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Sandstone (River Cobble)

Arenite

Granite

Granite (Felsic Intrusive)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Yellow Quartzite River Cobble

Meta-quartzite (SiO2 with iron oxide staining)

Shale

Shale (clastic sedimentary rock)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Basalt (River Pebble)

Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)

Vesicular Basalt (or Scoria)

Vesicular Basalt (Aphanitic-vesicular volcanic rock)

Granite

Granite

Banded Sandstone

Arenite (with iron oxide banding)

Sandstone (Ferruginous)

Arenite (Siliclastic Sedimentary Rock)

Gneiss (specifically Amphibolite Gneiss)

Gneiss

Ferruginous Sandstone (Ironstone)

Arenite with Limonite/Goethite cement

Quartz

Quartz (SiO2 - Silicon Dioxide)

Aventurine

Quartz (Aventurine variety)

Limonite Concretion

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

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Quartz-Veined Mudstone

Argillaceous Mudstone with Quartz Veining

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Banded Agate (Polished Slice)

Chalcedony (cryptocrystalline Quartz), SiO2

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Dalmatian Stone (Dalmatian Jasper)

Dalmatian Stone (A variety of Perthite / Aplite)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Basalt River Pebble

Aphanitic Mafic Basalt

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Agate (specifically Chalcedony nodule)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Garnet Schist

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

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Turritella Agate

Silicified Elimia tenera Fossil (SiO2)

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Serpentine (Serpentinite)

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

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)