Amber / Copal rock specimen

Amber / Copal

Succinite (fossilized resin)

mineraloid

Quartzite (Gold-Yellow variety) rock specimen

Quartzite (Gold-Yellow variety)

Quartzite (Silicon Dioxide, SiO2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Quartz Pebble (Iron-Stained) rock specimen

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

mineral

Dream Amethyst (Chevron Amethyst) rock specimen

Dream Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with Ferric Iron impurities

mineral

Nephrite Jade rock specimen

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Calcium magnesium iron silicate hydroxide)

metamorphic

Amethyst rock specimen

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

mineral

Amethyst (Ametrine variety) rock specimen

Amethyst (Ametrine variety)

Silicon Dioxide (SiO2) with iron impurities

mineral

Jasper with Agate Inclusions rock specimen

Jasper with Agate Inclusions

Jasper (Silicon Dioxide, SiO2) with Chalcedony/Agate

sedimentary

Bloodstone rock specimen

Bloodstone

Heliotrope (a variety of Cryptocrystalline Quartz / Jasper, SiO2)

mineral

Red Jasper (specifically Brecciated Jasper) rock specimen

Red Jasper (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with Hematite inclusions

sedimentary

Blue Apatite rock specimen

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

mineral

Red Jasper (Poppy Jasper variety) rock specimen

Red Jasper (Poppy Jasper variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Slate rock specimen

Slate

Slate (Foliated Metamorphic Rock)

metamorphic

Asphalt Chunk (with aggregate) rock specimen

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

sedimentary (anthropogenic/man-made conglomerate)

Chert (specifically Jasper/Carnelian variety) rock specimen

Chert (specifically Jasper/Carnelian variety)

Microcrystalline quartz (SiO2)

sedimentary

Granitic Gneiss rock specimen

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

metamorphic

Jasper with Iron Staining rock specimen

Jasper with Iron Staining

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

sedimentary

Schist rock specimen

Schist

Mica Schist

metamorphic

Red Sandstone rock specimen

Red Sandstone

Arenite (Ferruginous Sandstone)

sedimentary

Red Sandstone rock specimen

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)

sedimentary

Ferruginous Sandstone rock specimen

Ferruginous Sandstone

Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)

sedimentary

Chert (with Quartz/Chalcedony) rock specimen

Chert (with Quartz/Chalcedony)

Microcrystalline Quartz (SiO2)

sedimentary

Chert / Jasper rock specimen

Chert / Jasper

Microcrystalline Quartz (SiO2)

sedimentary

Milky Quartz rock specimen

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Red Scoria (Lava Rock) rock specimen

Red Scoria (Lava Rock)

Scoria (Vesicular Basalt)

igneous

Chert (Septarian Concretion/Nodule) rock specimen

Chert (Septarian Concretion/Nodule)

Microcrystalline silica (SiO2) with carbonate mineral veining

sedimentary

Rhyolite rock specimen

Rhyolite

Rhyolite

igneous

Sandstone (Quartzose) rock specimen

Sandstone (Quartzose)

Arenite (primarily SiO2)

sedimentary

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Quartz River Cobble rock specimen

Quartz River Cobble

Silicon Dioxide (SiO2)

Mineral (Primary constituent)

Limestone rock specimen

Limestone

Calcium carbonate (CaCO3)

sedimentary

Chert (Flint variety) rock specimen

Chert (Flint variety)

Microcrystalline context of Quartz (SiO2)

sedimentary

Sandstone (specifically Lithic or Quartz Arenite) rock specimen

Sandstone (specifically Lithic or Quartz Arenite)

Arenite (composed primarily of SiO2)

sedimentary

Red Jasper (Chert) rock specimen

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Milky Quartz (Water-worn Pebble) rock specimen

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

mineral

Quartzite rock specimen

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Agate Geode rock specimen

Agate Geode

Silicon Dioxide (SiO2) - Microcrystalline Quartz

mineral

Sandstone Concretion rock specimen

Sandstone Concretion

Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)

sedimentary

Sandstone (Ferruginous) rock specimen

Sandstone (Ferruginous)

Arenite (Fe-rich)

sedimentary

Quartzite Pebble rock specimen

Quartzite Pebble

Recrystallized Quartz (SiO2)

metamorphic