Amber

Succinite (a specific high-quality amber from the Baltic)

Organic Mineraloid

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

mineral

Red Quartzite / Jasper-rich Pebble

Quartzite (primarily SiO2 with hematite inclusions)

metamorphic

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

sedimentary

Basalt Pebble

Basalt

igneous

Jasper

Silicon dioxide (SiO2)

sedimentary

Jasper

Silicon dioxide (SiO2)

sedimentary

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

mineral

Chert (River Pebble)

Microcrystalline silicon dioxide (SiO2)

sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

sedimentary

Yellow Quartzite (River Pebble)

Quartzite (mainly SiO2)

metamorphic

Amber

Succinite (fossilized resin)

mineral

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

sedimentary

Quartzite

Quartzite (primarily SiO2)

metamorphic

Basalt Pebble

Aphanitic mafic volcanic rock

igneous

Basalt with vesicles (Amygdaloidal Basalt)

Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)

igneous

Petrified Wood

Silicon Dioxide (SiO2) permineralized organic matter

sedimentary

Chert (often called Flint or River Stone)

Microcrystalline Quartz (SiO2)

sedimentary

Porphyritic Basalt (Chinese Writing Stone or Flower Stone)

Porphyritic Basalt / Porphyry

igneous

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

sedimentary

Red Jasper (Heliotrope family variant)

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

sedimentary

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

sedimentary

Basalt with Iron Oxidation (Lattice/Veined)

Mafic Volcanic Rock (principally Plagioclase and Pyroxene)

igneous

Jasper

Cryptocrystalline Quartz (SiO2)

sedimentary

Tumbled Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

sedimentary

Red Chert (Jasper)

Chert / Microcrystalline Quartz (SiO2)

sedimentary

River Cobble (likely Basalt or Rhyolite)

Extrusive Igneous Rock (Mafic or Intermediate)

igneous

Red Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Jasper

Silicon dioxide (SiO2)

sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Chert (Cherty Limestone or Flint)

Microcrystalline Silica (SiO2)

sedimentary

Chert (specifically Tan Chert or Flint)

Silicon Dioxide (SiO2)

sedimentary

Blue Topaz

Al2SiO4(F,OH)2 (Fluorine-bearing aluminum silicate)

mineral

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

mineral

River Quartzite (River Rock)

Quartzite (SiO2)

metamorphic

Star Ruby

Corundum (Al2O3 with chromium and rutile inclusions)

mineral

Porphyry (Flower Stone)

Porphyritic Basalt or Andesite

igneous

Schist

Mica Schist

metamorphic

Green Chalcedony (likely Chrysoprase or Green Onyx)

Silicon Dioxide (SiO2) with trace nickel or chromium inclusions

mineral

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Quartzite

Quartzite (primarily SiO2)

metamorphic

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

igneous