Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Sandstone

Arenite (primarily SiO2)

Chert (Iron-stained)

Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)

Mica Schist

Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)

Basalt

Extrusive mafic igneous rock

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Turquoise

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

Citrine Quartz (Yellow Quartz)

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amazonite

Microcline (K(AlSi3O8))

Labradorite

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

Chlorastrolite (Isle Royale Greenstone)

Chlorastrolite (Pumpellyite-(Mg,Fe2+): Ca2MgAl2(Si2O7)(SiO4)(OH)2∙H2O)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Diamond

Native Carbon (C)

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Slate

Slate (Foliated Metamorphic Rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Rhodonite (in matrix)

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Sandstone (Quartzose)

Arenite (SiO2 principal)

Sandstone (Weathered Pebble)

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxides

Diorite (River Cobble)

Intermediate plutonic igneous rock

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Conglomerate (or Breccia)

Clastic Sedimentary Rock (Conglomeratic)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (with Feldspathic/Arkose qualities)

Arenite (primarily SiO2 with KAlSi3O8 components)

Diamond (set in a gold ring)

Carbon (C) - Adamantine cubic carbon

Sandstone (Ferruginous/Banded)

Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)

Jasper (Iron-rich Chalcedony)

Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (with iron oxide cement)