Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Category
Organic (Sedimentary Associated)
Browse organic (sedimentary associated) specimens identified by the Rock Identifier community.
Aragonite (variety 'Flos Ferri')
Aragonite (CaCO3)
Mineral
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary or igneous-associated mineral
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Green Aventurine
Aventurine Quartz (SiO2 with fuchsite inclusions)
Mineral
Garnet (likely Almandine, Pyrope, or a blend)
Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)
Mineral
Red Jasper (possibly)
Jasper (a variety of Chalcedony, SiO2)
Mineral
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Petrified Wood
Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)
Mineral/Fossil (Sedimentary context)
Biotite Schist
Biotite Schist
Metamorphic
Wood Jasper
Siliceous sedimentary rock (variety of Chert/Chalcedony)
Sedimentary
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Flint
Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)
Mineral
Chalcedony
Chalcedony (SiO₂)
Mineral
Sulfur on Aragonite
Sulfur (S) and Aragonite (CaCO3)
Mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Fossil Shark Tooth (Cretaceous white shark type)
Squalicorax (commonly known as Crow Shark)
Organic specimen (fossil)
Quartzite
Quartzite (SiO2)
Metamorphic
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Green Agate
Silicon dioxide (SiO₂)
mineral
Quartzite
Quartzite
Metamorphic rock
Blue Quartz
Quartz (SiO2) with inclusions
Mineral
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2
mineral
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Sedimentary Rock (technically chert, a microcrystalline quartz)
Amber
Amber (Fossilized Tree Resin)
Mineral
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Mineral
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (C10H16O)
Organic Gemstone (Mineraloid)
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Chert (varietal known as Jasper or Flint)
Silicon Dioxide (SiO2)
Sedimentary Rock
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Fancy Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Conglomerate
Conglomerate
Sedimentary Rock
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Amber
(C10H16O)n – an amorphous organic substance, primarily composed of polymerized isoprenoids.
Mineral
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic