Mineral Within A Sedimentary Rock

Chalcedony (Agate/Carnelian precursor)

Chalcedony (Silicon Dioxide, SiO2)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Ruby in Fuchsite (often confused with Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)

Pumice

Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)

Chalcedony in Host Rock

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Galena

Lead Sulfide (PbS)

Wonderstone

Rhyolite (Silicon Dioxide with Iron Oxide impurities)

Red Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Impurities

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Sandstone

Arenite (SiO2 based clastic rock)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Chert (concretionary/nodular variant)

Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Yellow Quartz (Chalcedony or Agate)

Silicon Dioxide (SiO2)

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)

Gneiss (complex silicate composition)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Dragon Stone

Argillaceous Sedimentary Rock (Ohko Stone)

Chert (variations include Flint/Chalcedony)

Chert (SiO2 - Silicon Dioxide)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Red Sandstone

Sandstone (mainly SiO2 with Iron Oxide cement)

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Banded Agate (with small Geode cavity)

Silicon Dioxide (SiO2) - Chalcedony variety

Jasper

Silicon Dioxide (SiO2)

Specular Hematite

Hematite (Fe2O3)

Conglomerate (or Breccia)

Clastic Sedimentary Rock

River Pebble (Siltstone/Mudstone)

Clastic sedimentary rock