Yellow Jasper
Silicon Dioxide (SiO2) with Ferric Hydroxide impurities
mineral
Category
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Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Lake Superior Agate style)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Rough Emerald/Green Beryl
Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium
mineral
Basalt with Iron Oxidation
Mafic Igneous Basalt
igneous
Jasper (Red/Brown Variety)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)
sedimentary
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Breccia
Breccia
sedimentary
Basalt with Quartz/Zeolite Inclusions
Porphyritic Basalt (SiO2 with Aluminosilicates)
igneous
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Basalt
Basalt (composition predominately Plagioclase feldspar and Pyroxene)
igneous
Diorite (Spotted or Dalmatian Stone effect)
Diorite (Intermediate Plutonic Rock)
igneous
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Felsic Igneous Rock (likely Rhyolite or weathered Granite)
Felsic Volcanic/Plutonic Rock
igneous
Chert / Flint Nodules in Limestone
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebble (with Iron Inclusions)
Quartzite (primarily SiO2 with Fe2O3/FeOOH impurities)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Quartz (Milky/Yellowish Pebble)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz (Carnelian-tinted Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Mica Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)
metamorphic
Banded Agate (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Yellow Quartz (Chalcedony or Agate)
Silicon Dioxide (SiO2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Mineral
Travertine
Calcareous Tufa (CaCO3)
sedimentary
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Banded Iron Formation
Banded Iron Formation (BIF)
Sedimentary
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
Igneous