Sandstone (River Cobble) rock specimen

Sandstone (River Cobble)

Clastic Sedimentary Rock (primarily Quartz with Feldspar)

sedimentary

Amber rock specimen

Amber

Succinurite (C10H16O)

mineraloid

Carnelian rock specimen

Carnelian

Chalcedony (SiO₂)

mineral

Rose Quartz rock specimen

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Rose Quartz rock specimen

Rose Quartz

Silicon dioxide (SiO2)

mineral

Muscovite Schist with Quartz rock specimen

Muscovite Schist with Quartz

KAl2(AlSi3O10)(OH)2 in Schistose matrix

metamorphic

Quartz (with iron oxide staining) rock specimen

Quartz (with iron oxide staining)

Silicon Dioxide (SiO2)

mineral

Chert (Jasper variety) rock specimen

Chert (Jasper variety)

Silicon Dioxide (SiO2)

sedimentary

Green Aventurine rock specimen

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

metamorphic

Green Fuchsite in Quartz (sometimes called Green Aventurine) rock specimen

Green Fuchsite in Quartz (sometimes called Green Aventurine)

Fuchsite (Chrome-rich Muscovite) K(Al,Cr)2(AlSi3O10)(OH)2 in Quartz SiO2

metamorphic

Green Aventurine rock specimen

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

metamorphic

Ocean Jasper (Orbicular Jasper) rock specimen

Ocean Jasper (Orbicular Jasper)

Spherulitic Chalcedony (SiO2)

igneous

Gneiss rock specimen

Gneiss

Gneiss

metamorphic

Greenschist (Greenstone) rock specimen

Greenschist (Greenstone)

Greenschist (Metamorphic rock containing chlorite, actinolite, and epidote)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Yellow Jasper rock specimen

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

sedimentary

Rose Quartz rock specimen

Rose Quartz

SiO2 (Silicon Dioxide)

mineral

Chert / Jasper rock specimen

Chert / Jasper

Microcrystalline Quartz (SiO2)

sedimentary

Scoria (Lava Rock) rock specimen

Scoria (Lava Rock)

Scoriaceous Basalt

igneous

Picture Jasper rock specimen

Picture Jasper

Silicon Dioxide (SiO2) with impurities

sedimentary

Chert (Flint variety) rock specimen

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

sedimentary

Quartz (Crystal Point/Fragment) rock specimen

Quartz (Crystal Point/Fragment)

Silicon Dioxide (SiO2)

mineral

Chert (Flint) rock specimen

Chert (Flint)

Microcrystalline Opaline Silica (SiO2)

sedimentary

Citrine Quartz rock specimen

Citrine Quartz

Silicon Dioxide (SiO2)

mineral

Quartz Geode rock specimen

Quartz Geode

Silicon Dioxide (SiO2)

mineral

Epidote Water-Worn Pebble rock specimen

Epidote Water-Worn Pebble

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

metamorphic

Banded Gneiss rock specimen

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic

Banded Gneiss rock specimen

Banded Gneiss

Gneiss

metamorphic

Ferruginous Sandstone rock specimen

Ferruginous Sandstone

Arenite with Hematite/Limonite cement

sedimentary

Botryoidal Hematite (included in Quartz/Limonite matrix) rock specimen

Botryoidal Hematite (included in Quartz/Limonite matrix)

Fe2O3 (Hematite) on Quartz (SiO2) / Limonite

mineral

Chert / Chalcedony (likely carnelian or flint variety) rock specimen

Chert / Chalcedony (likely carnelian or flint variety)

Silicon Dioxide (SiO2)

sedimentary

Quartz (Iron-stained) rock specimen

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

mineral

Yellow Chalcedony rock specimen

Yellow Chalcedony

Silicon Dioxide (SiO2)

mineral

Lapis Lazuli rock specimen

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

metamorphic

Sapphire rock specimen

Sapphire

Corundum (Al2O3)

mineral

Blue Sapphire (Tumbled/Polished) rock specimen

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

mineral

Lapis Lazuli (Tumbled Stone) rock specimen

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)

metamorphic

Carnelian (Flame Polished) rock specimen

Carnelian (Flame Polished)

Carnelian (SiO2 with Iron Oxide impurities)

mineral

Ferruginous Quartz rock specimen

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

mineral

Schist rock specimen

Schist

Mica Schist

metamorphic

Obsidian rock specimen

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

igneous