Sedimentary Or Igneous (Host Environment)

Labradorite (rough specimen)

Labradorite, a plagioclase feldspar in the labradorite–bytownite series; approximately (Ca,Na)(Al,Si)₄O₈

Chalcedony Nodule (Agate/Chert)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

Chert (Septarian Nodules / Weathered Silex)

Microcrystalline Quartz (SiO2)

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Ruby

Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)

Red garnet cabochon pendant

Likely almandine garnet, iron-rich garnet-group silicate (often approximated as Fe₃Al₂(SiO₄)₃); identification from the image is uncertain.

Quartz with Mica

Silicon Dioxide (SiO2) with Mica group inclusions

Milky quartz

Quartz (silicon dioxide, SiO₂)

Rough Chalcedony / Jasper Agate Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Pebble with Epidote / Chlorite Inclusions

Silicon Dioxide (SiO2) with Epidote/Chlorite inclusions

Quartz-rich pegmatite fragment

Pegmatite composed chiefly of quartz (SiO₂), with probable feldspar and mica inclusions

Blue calcite

Calcite (CaCO₃), blue variety

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-bearing chalcedony

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Copper-bearing Basalt with Epidote and Quartz

Native copper in basalt amygdaloidal matrix

Pegmatite

Igneous Pegmatite

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

Glauconitic Sandstone with possible Trace Fossil

Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Crystalline Silicon Dioxide (SiO2)

Quartz Vein in Sandstone

Quartz (SiO2) in Clastic Sedimentary Rock

Quartz-veined Sedimentary Rock

Sedimentary rock with hydrothermal quartz veins

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Yellow Quartz Pebble (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Jasper or Agate pendant

Silicon dioxide (SiO2)

Chalcedony / Agate with Botryoidal Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

White calcite fragment (likely limestone or marble)

Calcite, calcium carbonate (CaCO₃); exact host rock is uncertain from the image

Fossiliferous Chert

Silicon Dioxide (SiO2) with fossil inclusions

Rounded basalt cobble

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Chert (or Chalcedony) Nodule

Microcrystalline Quartz (SiO2)

Black Limestone with Calcite Veins

Carboniferous Limestone with Secondary Calcite Infill

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Quartz (Tumbled/Water-worn pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (SiO2)