Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
sedimentary
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
Limestone with Calcite Veining
Calcium Carbonate (CaCO3)
sedimentary
Granodiorite
Phaneritic-textured Intrusive Granodiorite
igneous
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Granite
Granite (a plutonic igneous rock)
Igneous
Gneiss (specifically a Granitic Gneiss)
Gneiss (Composition: Quartz, Feldspar, Mica)
metamorphic
Diorite
Diorite (Intermediate plutonic rock)
igneous
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Biggs Jasper (Picture Jasper)
Silicon Dioxide (SiO2) - Opaque Silicified Volcanic Ash
sedimentary
Flint (Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Aquamarine
Beryl (Be₃Al₂Si₆O₁₈), specifically a blue or cyan variety
Mineral
Amber
Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Quartzite Pebble (with Quartz veins)
Quartzite (SiO2)
metamorphic
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and magnesium inclusions
Mineral (Variety of Quartz/Chalcedony)
Yellow Chert (Jasper)
Chalcedony (SiO2) with iron oxide inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Granite
Granite (composed primarily of Quartz (SiO2), Alkali Feldspar, and Plagioclase)
igneous
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)
sedimentary
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Sandstone
Arenite
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Serpentine (Serpentinite)
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Quartzite (or Quartz Rich Conglomerate)
Quartzite (SiO2 silicon dioxide)
metamorphic
Chalcedony (specifically Agate or Flint)
Silicon Dioxide (SiO₂)
Mineral
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Hematite/Goethite shell with Sandstone core)
sedimentary
Yellow Jasper
Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions
sedimentary
Yellow Quartzite (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide staining
metamorphic