Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions
igneous
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Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous
Breccia Pebble
Sedimentary Breccia
sedimentary
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Limonite (Ironstone Concretion)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Amethyst (Tumbled)
Purple Quartz (SiO2 with iron impurities and irradiation)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Pegmatite
Coarse-grained Igneous Rock (Granitic Pegmatite)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Wonderstone (Banded Rhyolite)
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Bumble Bee Jasper
Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)
igneous
Quartzite
Metamorphosed Sandstone (SiO2)
metamorphic
Quartzite Pebbles
Quartzite (SiO2 silicon dioxide dominant)
metamorphic
Indigo Gabbro (also known as Mystic Merlinite)
Gabbro (composed of Plagioclase Feldspar, Pyroxene, and minor Magnetite/Ilmenite)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite (Potentially Ferruginous)
Quartzite (SiO2)
metamorphic
Red Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 with Au)
mineral
Sunstone
Oligoclase (Feldspar variety)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
gemstone
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Green Aventurine
Tectosilicate, variety of Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Gold-bearing Quartz
Auriferous Quartz (SiO2 with Native Gold inclusion)
mineral
Carnelian (Chalcedony)
Cryptocrystalline Quartz (SiO2) with Iron Oxide impurities
mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)
Mineral
Sandstone (likely Siltstone or Mudstone)
Clastic sedimentary rock (primarily SiO2 with various oxides)
sedimentary
Pink Granite
Granite (composed primarily of Orthoclase Felspar, Quartz, and Plagioclase)
igneous
Quartz / Common Opal
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral
Quartzite
Quartzite (SiO2)
metamorphic