Sedimentary (Artificial)

Smoky Quartz

Silicon Dioxide (SiO2)

Tumbled sandstone pebble

Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement

Small translucent tumbled crystal or gemstone

Indeterminate; likely quartz (SiO₂), possibly citrine or glass-like chalcedony

Tumbled chalcedony/agate (likely botryoidal variety)

Microcrystalline quartz, SiO₂; possibly druzy chalcedony or common agate

Polished river cobble, likely basalt or gabbro

Mafic igneous rock, probably basalt (plagioclase–pyroxene ± olivine)

Dyed Quartz (Candy Quartz / Aura Quartz Imitation)

Silicon Dioxide (SiO2)

Goldstone

Man-made glass containing cuprous oxide

Goldstone

Man-made glass infused with copper particles

Citrine Quartz

Silicon Dioxide (SiO2)

Tumbled Quartz

Silicon Dioxide (SiO2)

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Carnelian and Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Polished, carved gemstone (possibly dyed agate or glass-like material)

Unconfirmed from the image; no specific mineral can be identified reliably

Dyed Purple Agate

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

Bismuth

Native Bismuth (Bi)

Clear Quartz (Faceted)

Silicon dioxide (SiO2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

Tumbled banded gneiss or amphibolite

Banded metamorphic rock, likely quartz–feldspar–biotite gneiss with amphibole

Dyed, polished stone—possibly rhodonite or pink jasper

Likely rhodonite (MnSiO₃) or manganese-rich jasper; exact identification requires testing

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color may result from iron staining, but the photo cannot confirm citrine

Pink Satin Spar (Satin Spar Selenite Dyed)

Gypsum (CaSO4·2H2O)

Blue Crackle Quartz (Dyed Fire Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye treatment

Red Tiger's Eye

Pseudomorph of Quartz after Crocidolite (Silicon Dioxide: SiO2)

Peacock ore (iridescent bornite/chalcopyrite)

Bornite (Cu₅FeS₄), commonly sold as heat-treated chalcopyrite (CuFeS₂)

Prasiolite

Silicon Dioxide (SiO2)

Blue Quartzite (Dyed)

Silicon Dioxide (SiO2) with inclusions

Amethyst (Cabochon)

Silicon Dioxide (SiO2) with iron impurities

Rough Quartz (var. Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (SiO2)

Dyed Agate

SiO2 (Silicon Dioxide)

Iron Slag

Anthropogenic Vitreous Silicate (Byproduct of Smelting)

Blue Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Dyed Agate

Silicon Dioxide (SiO2) with synthetic dyes

Unidentified polished dark stone with a possible quartz fragment

Indeterminate; appearance may reflect polished basalt, obsidian, or iron-rich rock, with a pale quartz/feldspar inclusion

Peridot

Olivine (Mg, Fe)2SiO4

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with natural radiation treatment

Smoky Quartz

Silicon dioxide (SiO2)

Dyed or color-enhanced agate/microcrystalline quartz bead

Chalcedony (microcrystalline SiO₂), likely agate

Dyed Quartzite

Metamorphosed Quartz (SiO2) with synthetic pigment

Peridot

Olivine ((Mg, Fe)2SiO4)