Synthetic (Not A Rock Or Mineral)

Porphyritic Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Red Jasper (Brecciated Jasper)

SiO2 (Silicon Dioxide) with Ferric Iron inclusions

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Olivine/Peridot

Magnesium Iron Silicate (Mg,Fe)2SiO4

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Quartz (Iron-stained or Rose variant)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Red Sandstone

Arenite (with Iron Oxide)

Wishing Stone (Basalt/Greywacke with Quartz Vein)

Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Mica Schist

Crystalline Schist (often containing Muscovite, Biotite, and Quartz)

Red Sandstone

Sandstone (mainly SiO2 with Iron Oxide cement)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 major component)

Sandstone

Arenite (SiO2 based)

Lake Superior Agate

Banded Chalcedony (Silicon Dioxide / SiO2)

Turquoise

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

Opal

Hydrated Silica (SiO2·nH2O)

Rose Quartz (or Quartzite)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Diorite (Salt and Pepper Rock)

Diorite

Diamond (in Matrix)

Carbon (C)

Goethite

Goethite (FeO(OH))

Chrysocolla and Azurite in Matrix

Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Turquoise

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

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

Azurite and Malachite on Matrix

Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)

Sandstone

Arenite (Siliclastic sedimentary rock)