Mineral, Specifically A Rock Fragment

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Black Jasper

Silicon Dioxide (SiO2) with inclusions

Fossiliferous Limestone with Rugose Coral

Rugosa (order), typically preserved in CaCO3 (Calcite)

Fossiliferous Limestone (Coquina / Shell Limestone)

Bioclastic Limestone (CaCO3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Wishing Stone

Greenschist or Basalt with Quartz/Calcite Vein

Granite (Fine-grained)

Phaneritic Felsic Igneous Rock

Basalt with Calcite Veins

Aphanitic mafic volcanic rock with CaCO3 inclusions

Schist

Mica Schist (contains muscovite/biotite and quartz)

Fossiliferous Limestone (Crinoidal)

Calcium Carbonate (CaCO3) - Limestone containing bioclasts

Chert Nodules (with Gryphaea or Shell inclusions)

Microcrystalline Quartz (SiO2) with Calcitic inclusions

Banded Jasper (possibly "Picture Jasper")

Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Sandstone Concretion

Sedimentary concretion

Limonite (Iron Ore)

Goethite and related iron hydroxides (FeO(OH)·nH2O)

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Coquina

Biogenic Limestone

Fossiliferous Limestone (containing Brachiopods)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Bauxite

Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Biotite (Black Mica)

Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)

Ring with an Orange Inlay

N/A (Man-made object)

Calcite

Calcite (CaCO 3)

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic Inclusions

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite)

Turquoise in Matrix

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Quartz Pebbles

Silicon Dioxide (SiO2)

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Granite Pebble

Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Quartz Geode

Silicon Dioxide (SiO2)

Botryoidal Quartz / Calcite Geode crust

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Diorite (Salt and Pepper Rock)

Diorite

Banded Sandstone (Liesegang Rings)

Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock (Basalt)