Igneous, Sedimentary, Or Metamorphic (Mineral Based)

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

River Cobble (Conglomerate context)

Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Marble

Recrystallized Calcite (CaCO3)

Marble (Carrara style)

Recrystallized Calcite-rich Metamorphic Rock (CaCO3)

Quartz (Citrine)

Silicon Dioxide (SiO2)

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Smoky Quartz and Clear Quartz Geode

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sunstone

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

SiO2 (Silicon Dioxide)

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Smoky Quartz (SiO2 - Silicon Dioxide with aluminum impurities)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Amber

Succinates (Organic Gemstone)

Diorite (Salt and Pepper Rock)

Diorite

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Quartz (specifically Milky/Gray Quartz)

Silicon Dioxide (SiO2)

Basalt with Vesicular Texture (Beach Cobble)

Vesicular Basalt (Aphanitic Igneous Rock)

Chalcedony (Common Opal variant)

Silicon dioxide (SiO2) with varying levels of hydration

White Chalcedony (Agate)

Silicon Dioxide (SiO2)

Diorite (Salt and Pepper Rock)

Diorite

Basalt with Iron Oxidation

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt with Vesicles

Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)

Conglomerate

Conglomerate (Rock composed predominantly of rounded clasts > 2mm)

Greenstone (Epidote/Chlorite-rich Metabasalt)

Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Opal

Hydrated amorphous form of silica (SiO2·nH2O)

Scoria (with Iron Oxidation)

Vesicular Basalt / Scoria

Basalt (Weathered/River worn)

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Shale (possibly Carbonaceous or Oil Shale)

Laminated Mudstone (primarily clay minerals and quartz)

Basalt

Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Lapis Lazuli

Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2