Jasper (likely Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary (chemically precipitated mineral)
Category
Sedimentary Or Metamorphic Derived
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Red Jasper (Chert)
Silicon Dioxide (SiO2) with impure Iron Oxides
sedimentary
Quartz (with iron oxide staining)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
River Pebble (likely Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Siltstone or Fine-grained Sandstone pebble
Siltstone (primarily SiO2 with clay minerals)
sedimentary
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Gneiss with Quartz Veining
Gneiss (High-grade regional metamorphic rock)
metamorphic
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Kyanite
Kyanite (Al2SiO5)
Mineral
Yellow Quartzite (or Quartz River Pebble)
Silicon Dioxide (SiO2)
metamorphic
Quartzite (clastic/metamorphic subtype)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Yellow Quartzite River Cobble
Meta-quartzite (SiO2 with iron oxide staining)
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Orange Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
River Pebbles (Mixed Lithology)
Conglomerate clasts (Silica-rich and Metamorphic assemblages)
sedimentary
Banded Quartzite
Quartzite (SiO2 with impurities)
metamorphic
Biotite (Black Mica) in Host Rock
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Sedimentary and Metamorphic
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Citrine (Quartz variant)
SiO2 (Silicon Dioxide)
mineral
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Banded Agate
Agate (Silicon Dioxide / SiO2)
mineral
Quartzite Pebble (River Rock)
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Fancy Jasper (Multicolor Agate/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock