Sedimentary (If Natural Jasper) Or Artificial (If Slag)

Jasper (Green Jasper / River Jasper)

Silicon Dioxide (SiO2) with impurities

River Pebble (Siltstone / Basalt)

Microcrystalline Quartz / Indurated Mudstone / Fine-grained Basalt

Hag Stone

Perforated sedimentary rock (typically limestone, sandstone, or flint)

Shale

Shale (clay-rich mudstone)

Grey River Pebble (Greywacke / Basalt)

Stream-rounded silicate rock pebble

Red Jasper

Jasper (variety of Chert/Chalcedony, formula SiO2)

Red Jasper (or Ironstone/Jasper Conglomerate)

Microcrystalline Quartz with Hematite inclusions (SiO2 + Fe2O3)

Jasper (Iron-rich Chert)

Silicon Dioxide (SiO2) with impurities of Hematite or Goethite

Epidote (Unakite component) / Green Quartzite

Ca2(Al,Fe)3(SiO4)3(OH)

Banded Jasper / Yellow Jasper with Chlorite or Epidote inclusions

Silicon Dioxide (SiO2) with iron oxide and silicate impurities

Jasper (Banded / Brecciated Jasper Pebble)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Tiger Jasper (Polychrome Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral inclusions

Small rounded pebble

Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion

Limonite or Ironstone Nodule

Hydrated iron oxide-hydroxide (FeO(OH)·nH2O)

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Hydroxide impurities

Sandstone (Heart-shaped pebble)

Sedimentary Quartz Sandstone

Flint

Microcrystalline quartz (SiO2)

Quartz Pebble (Tumbled / River Pebble)

Silicon Dioxide (SiO2)

Tufa Rock and Tumbled Gemstones

Calcareous Tufa (Calcium Carbonate, CaCO3)

Agate (Water-Worn)

Cryptocrystalline quartz (SiO2)

Magnetite

Fe3O4 (Iron(II,III) oxide)

Chert / Flint

Cryptocrystalline quartz (SiO2)

Flint / Chert

Cryptocrystalline quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Agate

Silicon Dioxide (SiO2)

Chert (River Pebble)

Microcrystalline silica (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxide impurities

Green Quartz (Prasiolite/Adventurine/Jasper)

Silicon Dioxide (SiO2)

Shale

Lutaceous Sedimentary Rock

Dalmatian Jasper

Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)

Limonite/Goethite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Red Jasper (Quartz)

Silicon Dioxide (SiO2) with Iron impurities

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Yellow Jasper

Silicon dioxide (SiO2)

Tumbled azurite–malachite or blue jasper (tentative)

Likely azurite-bearing copper mineral aggregate; composition commonly Cu₃(CO₃)₂(OH)₂ with associated malachite Cu₂CO₃(OH)₂

Sandstone (likely Conglomerate or Gritstone)

Arenite (SiO2 based)

Jasper in Quartz / Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Fancy Jasper

Chalcedony (SiO2)

Shale / Mudstone

Laminated Mudrock (Siliciclastic Sedimentary Rock)

Red Jasper (possibly Brecciated Jasper or Bloodstone variety)

Jasper (Silicon Dioxide, SiO2)

Hematite bead bracelet

Hematite (Fe₂O₃), likely polished or magnetically enhanced beads