Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Category
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Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Botryoidal Chalcedony (Desert Rose / Agate)
Silicon Dioxide (SiO₂)
Mineral variant
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Basalt
Afanitic Mafic Basalt
igneous
Basalt
Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)
Igneous
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Serpentine
Antigorite/Chrysotile group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
metamorphic
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Basalt with Iron Oxidation (Lattice/Veined)
Mafic Volcanic Rock (principally Plagioclase and Pyroxene)
igneous
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Porphyritic Basalt
Porphyritic Basalt (with Plagioclase phenocrysts)
igneous
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
igneous
Basalt
Basalt
Igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Greywacke (River Pebble with Quartz Veins)
Greywacke (Indurated Sandstone); Veins: SiO2 (Quartz)
sedimentary
Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
Pumice
Pumice (Amorphous volcanic glass)
Igneous
Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)
Porphyritic Basalt (Mafic Extrusive)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Serpentinite
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
River Stone (likely Basalt or Greywacke)
Basalt with mineral veining
igneous
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Agate Geode
Silicon Dioxide (SiO2)
mineral
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Quartz Pebble (with Iron Staining)
Crystalline Silicon Dioxide (SiO2)
mineral
Schist
Schist (metamorphic rock)
metamorphic
Pahoehoe Basalt
Extrusive mafic volcanic rock
igneous
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Conglomerate
Conglomerate rock
sedimentary