Blue Agate (Dyed Chalcedony) rock specimen

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

mineral

Diamond (in a jewelry setting) rock specimen

Diamond (in a jewelry setting)

Carbon (C)

mineral

Shale rock specimen

Shale

Fissile Mudstone (Shale)

sedimentary

Unakite rock specimen

Unakite

Epidotized Granite

metamorphic

Unakite rock specimen

Unakite

Epidotized Granite

metamorphic

Chert (Jasper/Flint variety) rock specimen

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

sedimentary

Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.) rock specimen

Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)

Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)

mineral

Pyrite rock specimen

Pyrite

Iron Sulfide (FeS2)

mineral

Quartz Geode / Druzy Quartz rock specimen

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

mineral

Amber rock specimen

Amber

Succinite

Organic (Mineraloid)

Yellow Quartzite (River Pebble) rock specimen

Yellow Quartzite (River Pebble)

Quartzite (primarily Silicon Dioxide, SiO2)

metamorphic

Green Aventurine rock specimen

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

metamorphic

Green Aventurine rock specimen

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

metamorphic

Dalmation Stone rock specimen

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

igneous

Nephrite Jade rock specimen

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

metamorphic

Jasper rock specimen

Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Carnelian (Banded Agate) rock specimen

Carnelian (Banded Agate)

Chalcedony (SiO2) with Iron Oxide inclusions

mineral

Carnelian (Red Agate/Chalcedony) rock specimen

Carnelian (Red Agate/Chalcedony)

Cryptocrystalline Quartz (SiO2) with Hematite impurities

mineral

Carnelian (Chalcedony) rock specimen

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) with trace Iron Oxide

mineral

Banded Jasper (Carnelian Jasper) rock specimen

Banded Jasper (Carnelian Jasper)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

sedimentary

Smoky Quartz rock specimen

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Apache Tear (Obsidian) rock specimen

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

igneous

Red Jasper rock specimen

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

sedimentary

Carnelian (Red Agate) rock specimen

Carnelian (Red Agate)

Chalcedony (SiO2 with Iron Oxide impurities)

mineral

Jadeite (Jade) rock specimen

Jadeite (Jade)

Jadeite (NaAlSi2O6)

metamorphic

Banded Agate (Gray/White) rock specimen

Banded Agate (Gray/White)

Silicon Dioxide (SiO2) - Chalcedony variety

mineral

Tiger's Eye (likely variant or dark tumble) rock specimen

Tiger's Eye (likely variant or dark tumble)

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic

Moldavite rock specimen

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

tektite

Amazonite rock specimen

Amazonite

Amazonite (KAlSi3O8)

mineral

Orange Calcite rock specimen

Orange Calcite

Calcium Carbonate (CaCO3)

mineral

Amber rock specimen

Amber

Organic gemstone (Succinite is common if from the Baltic)

mineral

Green Quartz / Aventurine rock specimen

Green Quartz / Aventurine

Silicon Dioxide (SiO2) with inclusions

Metamorphic

Banded Agate rock specimen

Banded Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

mineral

Jasper (specifically Yellow Jasper and Red Jasper) rock specimen

Jasper (specifically Yellow Jasper and Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Fluorite rock specimen

Fluorite

Calcium Fluoride (CaF2)

mineral

Rose Quartz rock specimen

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Clear Quartz rock specimen

Clear Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Granite Pebble rock specimen

Granite Pebble

Granite

igneous

Chert (Flint variety) rock specimen

Chert (Flint variety)

Chert (SiO2)

sedimentary

Carnelian (Red Chalcedony) rock specimen

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

mineral

Orange Calcite (Cleavage Rhomb) rock specimen

Orange Calcite (Cleavage Rhomb)

Calcite (Calcium Carbonate, CaCO3)

mineral

Chert (often called Flint in various colors) rock specimen

Chert (often called Flint in various colors)

Silicon Dioxide (SiO2)

sedimentary