Quartzite (River Stone)
Quartzite
metamorphic
Amazonite
Microcline (KAlSi3O8) with Trace Elements
mineral
Chert (Basanite variety)
Microcrystalline Quartz (SiO2)
sedimentary
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Chert (with Quartz veins)
Microcrystalline quartz (SiO2)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Chert (and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Anthracite
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Anthracite
Anthracite (highest-grade coal)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Chert (often called Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (Ferruginous)
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Moonstone (Orthoclase Feldspar)
(K,Na)AlSi3O8
mineral
Limonite (Ironstone)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Jasper (Iron-stained)
Jasper (Silicon Dioxide, SiO₂ with Iron inclusions)
sedimentary
Amygdaloidal Rhyolite
Amygdaloidal Rhyolite (Felsic volcanic rock)
igneous
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Copper Nugget
Native Copper (Cu)
mineral
Basalt Porphyry
Porphyritic Basalt
igneous
Vesicular Basalt (Aqueous Tumbled)
Scoriaceous Basalt
igneous
Vesicular Basalt
Basalt with vesicular texture
igneous
Hematite with Magnetite
Iron Oxide (Fe2O3)
mineral
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Limonite and Goethite on Gossan
FeO(OH)·nH2O
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with goethite/iron oxide inclusions
sedimentary
Basalt with Epidote (Porphyry)
Basalt (with inclusions of Epidote/Feldspar)
igneous
Chert (Jasper nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Quartzite
Quartzite
metamorphic
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Quartzite (with Metamorphic Foliation)
Quartzite (Recrystallized SiO2)
metamorphic