Sedimentary Or Metamorphic (Low Grade)

Basalt

Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Jasper with Epidote Vein

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

Gold-Bearing Quartz

Silicon Dioxide with Native Gold (SiO2 + Au)

Apache Tear

Obsidian (Volcanic Glass), SiO2 + MgO, Fe3O4

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Milky Quartz

Silicon dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pebble

Clast (specifically a granule or small pebble)

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Peridot (Olivine)

Olivine, (Mg, Fe)2SiO4

Diamond in Kimberlite

Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)

Rough Diamond

Diamond (Native Element Carbon, C)

Turquoise

Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Bismuth Crystal

Bismuth (Bi)

Blue Topaz (facetted in jewelry)

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Black Onyx (Tumbled)

Silicon Dioxide (SiO2)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Chrysocolla in Quartz (Gem Silica)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)

Basalt

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Lazulite

Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2

Pumice

Pumice (a highly vesicular volcanic glass)

Quartzite / Sandstone / Chert Mix

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz (Milky or Rough Variety)

Silicon Dioxide (SiO2)

Blue Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Red Jasper (Brecchiated Jasper)

Silicon Dioxide (SiO2) with Hematite impurities

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Gold Ore in Quartz

Auriferous Quartz (SiO2 with Au inclusions)

Ocean Jasper (Orbicular Jasper)

Spherulitic Chalcedony/Rhyolite (SiO2)

Pumice

Pumice (a highly vesicular volcanic rock)

Schist

N/A (a rock type, not a mineral formula)