Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)

Dalmatian Stone (Dalmation Jasper)

Aplite with Arfvedsonite inclusions

Quartz

Quartz (SiO₂)

Gneiss

High-grade foliated metamorphic rock

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)

Eudialyte in Matrix

Na15Ca6Fe3Zr3Si26O72(OH,Cl,H2O)3

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Gneiss

Gneiss

Arsenopyrite in Quartz/Host Rock

Arsenopyrite (FeAsS)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Ferruginous Sandstone (Ironstone Nodules)

Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Clear Quartz

Silicon Dioxide (SiO2)

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Bismuth

Bismuth (Bi)

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Pyrite with Iron Oxides (Fool's Gold in Matrix)

Iron Sulfide (FeS2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Quartz Pebbles

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Amethyst

Crystalline Quartz (SiO2) with iron impurities

Milky Quartz

Silicon Dioxide (SiO2)

Sandy Ironstone

Ferruginous Sandstone

Porphyritic Basalt (with Amygdales)

Amygdaloidal Porphyritic Basalt

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Schist

Chlorite/Mica Schist

Clear Quartz

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Silver (Jewelry form)

Native Silver (Ag)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4

Bryozoan Fossil

Phylum Bryozoa (commonly known as 'moss animals')

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Common Opal in Host Rock

Hydrated Silica (SiO2·nH2O)