Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Desert Rose
Baryte or Gypsum variation (CaSO4·2H2O or BaSO4)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Schorl (Black Tourmaline) in Quartz or Feldspar Matrix
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl) in Granitic Pegmatite
igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Pink Anthracite Coal (dyed)
Anthracite Coal (Artificially Colored)
Sedimentary Rock (Altered)
Ferruginous Sandstone
Ferruginous Clastic Sedimentary Rock
sedimentary
Dragon Blood Jasper (Epidote with Piedmontite or Quartz)
Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))
metamorphic
Yellow Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Dendritic Agate (Tree Agate)
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
mineral
Eye Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Bull Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily Quartz-rich sedimentary rock)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Greenschist
Greenschist facies metamorphic rock
metamorphic
Quartz (Clear or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Serpentine (variety: Serpentine Rock)
Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Druzy Quartz on Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony in Matrix
Silicon Dioxide (SiO2)
mineral
Gold Ore
Native Gold (Au) in Matrix
mineral
Zinc Ore (Sphalerite in Matrix)
Sphalerite (Zn,Fe)S within a carbonate or silicate host rock
mineral
Blue Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Glauconite (Greensand)
(K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geode
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
mineral / metamorphic
Biotite Schist
Biotite Mica Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Schist
Mica Schist
metamorphic
Amethyst
SiO2 (Silicon Dioxide)
mineral
Sandstone (with potential Quartzite characteristics)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz with Iron Oxide
Silicon Dioxide (SiO2) with Fe2O3 inclusions
mineral
Basalt
Mafic volcanic rock (primarily Plagioclase and Pyroxene)
igneous