Industrial Byproduct (Anthropogenic Material)

Included quartz pendant (likely tourmalinated quartz)

Quartz, SiO₂, with dark mineral inclusions; inclusions may be black tourmaline (schorl)

Dendritic jasper/chalcedony

Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites

Pale green rough mineral fragment, likely green fluorite

Fluorite (calcium fluoride, CaF₂) — identification is tentative from the photo

Fossil or modern bivalve shell

Calcium carbonate shell, likely aragonite (CaCO₃); exact species cannot be determined from the image

Tumbled jasper (possibly orbicular jasper)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Tumbled orange-brown stone, possibly quartzite or jasper

Undetermined; likely iron-stained quartz-rich rock (quartz, SiO₂)

Polished amber-colored translucent stone, likely citrine or yellow chalcedony

Most consistent with quartz (SiO₂), potentially citrine; translucent yellow chalcedony is another possibility

Iron-stained chalcedony or jasper

Microcrystalline quartz (SiO₂), likely ferruginous jasper/chalcedony

Red Sandstone

Arenite (Ferruginous Sandstone)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Quartz (Yellow/Citrine variety or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Limestone with Iron Oxide Staining

Sedimentary Rock (Calcite, CaCO3)

Sandstone

Arenite (SiO2 based)

Limestone with Iron Inclusions

Calcium Carbonate (CaCO3) with Hematite/Limonite

Fluorescent glassy mineral specimen, possibly hyalite opal

Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative

Tumbled amazonite

Amazonite, green microcline feldspar (KAlSi₃O₈)

Likely beach-worn pebbles

Lithified rock fragments; exact rock type cannot be determined from the photo

Diamond

Carbon (C)

Unidentified mineral specimen, possibly quartz-bearing rock

Undetermined from the photograph; no diagnostic mineral or rock name can be assigned reliably.

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite pebble

Quartzite (SiO2)

Polished ocean jasper (orbicular chalcedony)

Silica-rich microcrystalline quartz, SiO₂; commonly sold as ocean jasper

Small rounded pebble, likely quartz-rich river or beach stone

Unidentified lithic pebble; exact rock type cannot be determined from the image

Fossil bivalve shell

Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized

Diamond

Carbon (C)

Tiger’s-eye fragment

Chatoyant quartz, SiO₂, with pseudomorphic iron-oxide fibers

Star sapphire ring

Corundum (Al₂O₃), likely asteriated sapphire

Quartzite Pebbles

Quartzite (SiO2)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Likely sandstone or weathered quartz-rich rock fragment

Quartz-rich sandstone; exact identification is uncertain from the photograph

Vesicular basalt (scoriaceous basalt)

Basalt, chiefly plagioclase feldspar and pyroxene with minor olivine; vesicles formed by trapped volcanic gas

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Diamond

Carbon (C)

White quartz bead strand

Quartz, silicon dioxide (SiO₂), likely milky or translucent quartz; beads are polished and drilled

Amethyst (likely synthetic or treated)

Purple quartz, SiO₂; color caused mainly by trace iron and irradiation

Sea Glass

Amorphous Silica (SiO2) with various additives

Diamond

C

Polished banded stone, likely zebra jasper

Zebra jasper (banded microcrystalline quartz, chiefly SiO₂, with iron-oxide and carbonate impurities)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Weathered rock pebble, possibly quartz-rich sandstone

Uncertain from the image; likely quartz-bearing sandstone with iron-oxide staining