Mineral, Often Found As A Rock

Botryoidal Chalcedony (Desert Rose / Agate)

Silicon Dioxide (SiO₂)

Gowganda Tillite (Puddingstone)

Glacial Diamictite (Gowganda Formation)

Quartz / Common Opal

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Turquoise

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

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

Unakite

Unakite (altered granite)

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Quartz Geode (partially opened)

Silicon Dioxide (SiO2) with iron staining

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Gold Ore

Native Gold (Au) in Matrix

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Amber Chert (Jasper)

Microcrystalline Quartz (SiO2)

K2 Jasper (Beads)

Granodiorite with Azurite and Malachite

Shale (sub-type: Carbonaceous Shale)

Lutaceous Sedimentary Rock

Chert (Agatized/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Sandstone (Quartzose)

Arenite (SiO2 principal)

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Sandstone

Arenite (composed primarily of SiO2)

River Rock (Greywacke/Sandstone)

Lithic Wacke

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)

Howlite and Purple Amethyst Druzy

Calcium Borosilicate Hydroxide (Howlite) and Silicon Dioxide (Quartz/Amethyst)

Ferruginous Sandstone (Ironstone)

Arenite with Limonite/Goethite cement

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)

River Rock

Sedimentary Rock (various compositions)

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2) and Slate/Shale

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Chert (variant Flint/Novaculite)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Leopard Skin Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Sandstone

Arenite (SiO2 based with various mineral cements)