Mineral Or Sedimentary Rock (With Mineral Inclusions)

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

River Pebble (Quartzite/Chert)

Quartzite with inclusions (SiO2)

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Schist (Micaceous Schist)

Schist (containing mainly Muscovite and Quartz)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

N/A (Non-Geological Specimen)

Gneiss (Metamorphic Rock)

Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Septarian Nodule

Septarian concretion (Complex mixture of Siderite/Limestone, Calcite, and Aragonite)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Quartz (White/Milky Pebble)

Silicon Dioxide (SiO2)

Sandstone

Sandstone (principally SiO2)

Peridotite (Pyroxenite/Serpentinized Dunite)

Ultramafic Rock (consisting primarily of Olivine and Pyroxene)

Carnelian

Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Rose Quartz

Silicon dioxide (SiO2)

Chalcedony in Host Rock

Chalcedony (SiO2)

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O

Rose Quartz

Silicon dioxide with traces of titanium, iron, or manganese (SiO2)

Rose Quartz

Silicon dioxide with traces of titanium, iron, or manganese (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Pink Quartz (Inclusion-filled)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Red Jasper (possibly)

Jasper (a variety of Chalcedony, SiO2)

Strawberry Quartz

Quartz with Hematite inclusions (SiO2 + Fe2O3)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2 + Fe2O3

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

Basalt

Basalt (Mafic Extrusive)

Rose Quartz

Silicon Dioxide (SiO2) with inclusions of Dumortierite or similar minerals