Man Made Material, Not A Natural Rock Or Mineral Specimen

Brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement

Sandstone

Arenite (siliciclastic sedimentary rock composed mostly of quartz)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Weathered sandstone pebble

Clastic sandstone, predominantly quartz (SiO₂) grains cemented by silica, calcite, or iron oxides

Tumbled turquoise-like stone

Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Granite Boulder

Felsic Intrusive Igneous Rock

Diamond in Kimberlite

Diamond (C in Kimberlite)

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Small pale rock fragment

Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment

Chert (and Agate/Chalcedony)

Microcrystalline Quartz (SiO2)

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Sandstone Pebble / Quartzite Pebble

SiO2 (Silicon Dioxide enriched sedimentary rock)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Brecciated jasper (likely red-and-cream jasper)

Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining

Red Quartzite River Pebble

Quartzite (SiO2 with iron oxide inclusions)

Dyed Blue Agate Slice

Silicon Dioxide (SiO2)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Yellow calcite crystal cluster with calcite fragment

Calcite, calcium carbonate (CaCO₃)

Sandstone (Quartzose Sandstone)

Clastic Terrigenous Sedimentary Rock (primarily SiO2)

Dyed Agate Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Carnelian and Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite and Limonite inclusions

Slate

Slate (Foliated Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (likely Ferruginous)

Arenite with Iron Oxide cement

Sandstone

Sandstone (SiO2 dominated)

Sandstone

Arenite (SiO2 primarily)

Milky quartz cluster

Quartz (silicon dioxide, SiO₂), likely druzy or microcrystalline quartz

Banded Ironstone / Jasper Siltstone

Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))

Weathered pink granite fragment

Granite, chiefly quartz, potassium feldspar, and plagioclase feldspar with minor mica

Smoky Quartz

Silicon Dioxide (SiO2)

Carved serpentine wing sculpture

Serpentine-group rock, chiefly antigorite/lizardite: Mg3Si2O5(OH)4

Coquina

Biogenic Limestone (CaCO3)

Amygdaloidal Basalt with Quartz

Basalt with Secondary Mineral Infilling

Chert Concretion (Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Small dark mineral/rock fragment

Indeterminate; possibly magnetite-bearing basalt or iron-rich slag

Blue Agate Geode Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Red Sandstone

Arenite (Iron-rich)