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

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

Citrine Quartz

Citrine (Silicon Dioxide - SiO2)

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

Diamond (in Jewelry)

Carbon (C)

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

Azurite and Malachite on Matrix

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

Jasper

Silicon dioxide (SiO2) with impurities

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Olivine in Basalt (Peridotite Xenolith)

Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Pyrite Geode (Sparkling Druzy)

Iron Sulfide (FeS2) in Sedimentary Nodule

Amber (Dark/Black Variety)

Succinite (Resinite), C10H16O

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Amber

Succinite (fossilized resin)

Sandstone (Weathered Pebble)

Arenite (SiO2 primarily)

Sunstone (Feldspar)

Plagioclase Feldspar ((Ca, Na)(Al, Si)4O8)

Shale (sub-type: Carbonaceous Shale)

Lutaceous Sedimentary Rock

Moss Agate

Cryptocrystalline Quartz (SiO2 with Manganese or Iron Oxide inclusions)

Sandstone (Quartzose)

Arenite (composed mainly of SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Sunstone

Oligoclase or Andesine (Feldspar Group), (Ca,Na)((Al,Si)4O8)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Sunstone

Oligoclase (a variety of Plagioclase Feldspar) - (Na,Ca)(Si,Al)4O8

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Precious Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Sandstone Clast

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Banded Agate (specifically Carnelian Agate)

Silicon dioxide (SiO2) - Chalcedony variety

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

Quartz (in matrix)

Quartz (SiO₂)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Sandstone

Arenite (primarily SiO2)