Quartzite rock specimen

Quartzite

Quartzite (chiefly SiO2)

metamorphic

Yellow Quartz (Citrine or Iron-stained Quartz) rock specimen

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

mineral

Yellow Quartz Pebble rock specimen

Yellow Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

mineral

Banded Gneiss rock specimen

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

metamorphic

Petrified Wood rock specimen

Petrified Wood

Silicified Wood (SiO2)

metamorphic

Yellow Jasper rock specimen

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

sedimentary

Ironstone Concretion (Iron-rich Mudstone) rock specimen

Ironstone Concretion (Iron-rich Mudstone)

Siderite / Geothite concretion (FeCO3 / FeO(OH))

sedimentary

Green Aventurine rock specimen

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

mineral

Yellow Howlite (Dyed Magnesite/Howlite) rock specimen

Yellow Howlite (Dyed Magnesite/Howlite)

Dyed Ca2B5SiO9(OH)5 (Howlite) or MgCO3 (Magnesite)

mineral

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Amazonite rock specimen

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate)

mineral

Banded Agate rock specimen

Banded Agate

Agate (Silicon Dioxide, SiO2)

mineral

Banded Agate rock specimen

Banded Agate

Cryptocrystalline Quartz (SiO2)

mineral

Banded Agate rock specimen

Banded Agate

Silicon dioxide (SiO2) - variety of Chalcedony

mineral

Calcite rock specimen

Calcite

Calcium Carbonate (CaCO3)

mineral

Green Aventurine rock specimen

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

metamorphic

Breccia rock specimen

Breccia

Breccia - Clastic sedimentary rock

sedimentary

Quartz Veined Basalt rock specimen

Quartz Veined Basalt

Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)

igneous

Rhyolite rock specimen

Rhyolite

Rhyolite (High-silica volcanic rock)

igneous

Rhyolite rock specimen

Rhyolite

Rhyolite

igneous

Quartzite River Rock rock specimen

Quartzite River Rock

Quartzite (Silicon Dioxide, SiO2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (mostly SiO2)

metamorphic

Gneiss rock specimen

Gneiss

Gneiss (High-grade metamorphic rock)

metamorphic

Rhodonite rock specimen

Rhodonite

(Mn,Fe,Mg,Ca)SiO3

mineral

Basalt River Pebble rock specimen

Basalt River Pebble

Basalt

igneous

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Quartzite Pebble rock specimen

Quartzite Pebble

Metamorphic Quartzite (SiO2)

metamorphic

Banded Chert rock specimen

Banded Chert

Microcrystalline Quartz (SiO2)

sedimentary

Quartz (Quartzite or Quartz Pebble) rock specimen

Quartz (Quartzite or Quartz Pebble)

Silicon Dioxide (SiO2)

metamorphic

Labradorite rock specimen

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

mineral

Orange Calcite (Mexican Onyx) rock specimen

Orange Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

mineral

Jasper with Agate Inclusions rock specimen

Jasper with Agate Inclusions

Silicon Dioxide (SiO2)

sedimentary

Amazonite rock specimen

Amazonite

K(AlSi3O8) - Microcline variant

mineral

Orange Calcite rock specimen

Orange Calcite

Calcium Carbonate (CaCO3)

mineral

Biotite Schist with Garnet rock specimen

Biotite Schist with Garnet

Garnet-Biotite Schist

metamorphic

Chert (Jasper variation) rock specimen

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

sedimentary

Chert (Jasper variety) rock specimen

Chert (Jasper variety)

Chert (SiO2)

sedimentary

Marble (White) rock specimen

Marble (White)

Metamorphosed Limestone (mainly CaCO3)

metamorphic

Chalcedony in Host Rock rock specimen

Chalcedony in Host Rock

Chalcedony (SiO2)

mineral

Banded Agate (with Quartz Geode Center) rock specimen

Banded Agate (with Quartz Geode Center)

Silicon Dioxide (SiO2)

mineral

Tourmalinated Quartz rock specimen

Tourmalinated Quartz

Silicon dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)

mineral

Pumice rock specimen

Pumice

Pumice (Vesicular volcanic glass)

igneous