All rocks & minerals

Amethyst

Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Greenstone

Metabasalts and metavolcanics

Quartz Geode

Silicon Dioxide (SiO2)

Greenstone

Metabasalt / Greenstone (low-grade metamorphic rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Intrusive igneous rock

Fossilized Shark Tooth

Chondrichthyes (Class)

Chert Arrowhead / Prehistoric Artifact

Cryptocrystalline Quartz (SiO2) - Artifact

Limestone

Calcium Carbonate (CaCO3)

Chert / Flint Arrowhead

Microcrystalline Quartz (SiO2)

Ruby

Corundum (Al2O3:Cr)

Agate

Silicon Dioxide (Chalcedony), SiO2

Flint / Chert (or fossiliferous nodule)

Microcrystalline quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Quartzite

Quartzite (Metamorphosed Quartz Arenite)

Agate

Silicon Dioxide (Chalcedony), SiO2

Agate

Silicon Dioxide (Chalcedony), SiO2

Slate

Metamorphic Pelitic Rock

Diamond

Carbon (C)

Diamond

Carbon (C)

Whetstone

Novaculite

Apache Tear (Obsidian)

Volcanic Glass (Amorphous SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Sandstone

Sedimentary Rock (Quartz Arenite)

Chert (Flint)

Silicon dioxide (microcrystalline quartz, SiO2)

Pink Quartz

Silicon Dioxide (SiO2)

Jasper in Quartz / Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Granite

Intrusive igneous rock

Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Quartz Vein / Quartzite

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Granite

Intrusive Igneous Rock

Limestone

Calcium Carbonate (CaCO3)

Granite

Intrusive Igneous Rock

Basalt

Extrusive Igneous Rock

Quartz Rock

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Basalt Pebble

Extrusive igneous rock