Blue Chalcedony (Tumbled) rock specimen

Blue Chalcedony (Tumbled)

Silicon Dioxide (SiO2)

mineral

Sodalite rock specimen

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

igneous

Red Jasper rock specimen

Red Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)

sedimentary

Fluorite rock specimen

Fluorite

Calcium Fluoride (CaF2)

mineral

Carnelian rock specimen

Carnelian

Carnelian (variety of Chalcedony, SiO2)

mineral

Blue Howlite (Dyed) rock specimen

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

mineral

Rhodonite rock specimen

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

mineral

Leopard Skin Jasper rock specimen

Leopard Skin Jasper

Orbicular Rhyolite (Silicon Dioxide with various impurities)

sedimentary

Pumice rock specimen

Pumice

Pumice (extrusive volcanic rock)

igneous

Lapis Lazuli rock specimen

Lapis Lazuli

Lapis lazuli (primary component: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

metamorphic

Blue Agate rock specimen

Blue Agate

Chalcedony (SiO2)

mineral

Diorite (River Cobble) rock specimen

Diorite (River Cobble)

Phaneritic Intermediate Igneous Rock

igneous

Diorite rock specimen

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous

Quartz (Milky/Smoky variety) rock specimen

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

mineral

Banded Agate (Lake Superior Agate type) rock specimen

Banded Agate (Lake Superior Agate type)

Agate (Cryptocrystalline Variety of Quartz, SiO2)

mineral

Greenstone with Quartz Veining rock specimen

Greenstone with Quartz Veining

Epidiorite or Metabasalt with SiO2 (Quartz) veins

metamorphic

Quartz (Iron-Stained Quartz Pebble) rock specimen

Quartz (Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2)

mineral

River Cobble (Quartzite-rich Sandstone) rock specimen

River Cobble (Quartzite-rich Sandstone)

Clastic Sedimentary Rock (Litharenite/Quartzite transition)

sedimentary

Milky Quartz rock specimen

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Quartzite Cobble rock specimen

Quartzite Cobble

Quartzite (primarily SiO2)

metamorphic

Limestone (specifically Fossiliferous Limestone) rock specimen

Limestone (specifically Fossiliferous Limestone)

Calcium Carbonate (CaCO3)

sedimentary

Quartz Pebble (with Manganese dendrites/staining) rock specimen

Quartz Pebble (with Manganese dendrites/staining)

Silicon Dioxide (SiO2) with Manganese Oxide impurities

mineral

Basalt rock specimen

Basalt

Basalt (Mafic volcanic rock)

igneous

Quartz (Milky/Yellowish variety) rock specimen

Quartz (Milky/Yellowish variety)

Silicon Dioxide (SiO2)

mineral

Ironstone Concretion (Limonite/Goethite) rock specimen

Ironstone Concretion (Limonite/Goethite)

Ironstone (primarily FeO(OH)·nH2O)

sedimentary

Yellow Quartzite (River Pebble) rock specimen

Yellow Quartzite (River Pebble)

Silicon Dioxide (SiO2) with iron oxide inclusions

metamorphic

Granite rock specimen

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

igneous

Diorite rock specimen

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous

Gneiss (with Quartz and Biotite Mica) rock specimen

Gneiss (with Quartz and Biotite Mica)

Gneiss

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Yellow Quartz (Citrine or Quartzite Pebble) rock specimen

Yellow Quartz (Citrine or Quartzite Pebble)

Silicon Dioxide (SiO2)

mineral

Chert (Basanite / Flint) rock specimen

Chert (Basanite / Flint)

Microcrystalline silica (SiO2)

sedimentary

Quartz (River Pebble) rock specimen

Quartz (River Pebble)

Silicon Dioxide (SiO2)

mineral

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Oolitic Limestone rock specimen

Oolitic Limestone

Oolite (Sedimentary Calcium Carbonate)

sedimentary

Chert (Nodule) rock specimen

Chert (Nodule)

Silicon Dioxide (SiO2)

sedimentary

Crystalline Quartz (Rough) rock specimen

Crystalline Quartz (Rough)

Quartz (Silicon Dioxide, SiO2)

mineral

Gabbro rock specimen

Gabbro

Gabbro

igneous

Labradorite (Feldspar) rock specimen

Labradorite (Feldspar)

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

mineral

Granitic Pegmatite rock specimen

Granitic Pegmatite

Pegmatitic Granite

igneous

Granite (Weathered) rock specimen

Granite (Weathered)

Phaneritic Felsic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

igneous

Gold Ore rock specimen

Gold Ore

Auriferous Quartz and Sulfide Mineralization in Host Rock

igneous