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

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Greenstone

Metamorphosed Mafic Igneous Rock

Basalt with Quartz/Calcite Vein

Amygdaloidal Basalt (matrix) with Mineral Vein filling

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous matrix

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Diamond in Kimberlite

Kimberlite host rock with C (Carbon) inclusion

Dumortierite Quartz

Dumortierite (Al7BCuO15)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Gneiss

Gneiss (High-grade metamorphic rock)

Yellow Quartz

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Greenstone / Diorite

Intermediate plutonic igneous rock

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Clear Quartz Point

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Basalt

Mafic Extrusive Igneous Rock

Quartz

Quartz (SiO₂)

Granite

Granite (Felsic Plutonic Rock)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Limonite (Bog Iron)

Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O

Vesicular Basalt

Mafic Volcanic Rock (Basalt)

Calcite

Calcium Carbonate (CaCO3)

Quartzite (River Pebble)

Quartzite (composed primarily of Silica, SiO2)

Magnetite

Magnetite (Fe3O4)

Snowflake Obsidian

Volcanic glass containing Spherulites (SiO2)

Greenschist

Greenschist (chlorite-epidote schist)

Sodalite Syenite

Sodalite-bearing Syenite (Na8(Al6Si6O24)Cl2)

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

Amygdaloidal Basalt with Epidote

Vesicular Basalt with secondary Epidote/Quartz mineral infill

Granite

Granite (a common igneous rock)

Green Aventurine

Quartz variety (SiO2 with inclusions)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)