Mineral (Occurring As A Rolled Clast)

Browse mineral (occurring as a rolled clast) specimens identified by the Rock Identifier community.

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Quartzite Pebble

Quartzite (primarily SiO2)

metamorphic

Brown Jasper (Likely)

Jasper (Cryptocrystalline Silicon Dioxide - SiO2)

Mineral

Diamond

Diamond (Carbon, C)

Mineral

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

sedimentary

Granite (with Muscovite Mica)

Phaneritic Felsic Igneous Rock (primarily Quartz SiO2, K-Feldspar KAlSi3O8, and Muscovite KAl2(AlSi3O10)(OH)2)

igneous

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

sedimentary

Hag Stone

Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes

sedimentary

River/Stream Pebble

Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)

Mineral, specifically a rock fragment

Travertine

Terrestrial Sedimentary Rock (CaCO3)

sedimentary

Onyx

Onyx (a variety of Chalcedony, SiO₂)

Mineral

Titanium Quartz (Rough)

Titanium-included Silicon Dioxide (SiO2 + Ti)

mineral

Red Amber (Burmite/Cherry Amber)

Succinite / Retinite (Organic Fossilized Resin, C10H16O)

Mineraloid (Organic)

Jasper

Silicon dioxide (SiO2) with impurities

sedimentary

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

sedimentary

Jasper

Jasper (Silica, SiO2)

sedimentary

Quartzite Pebble

Quartzite (SiO2)

metamorphic

Red Jasper

Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2

sedimentary

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Mineral

Obsidian

Obsidian (Extrusive Volcanic Glass)

igneous

Red Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Petrified Wood

Silicified Wood (SiO2)

sedimentary

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

mineral

Chert

Silicon dioxide (SiO2)

sedimentary

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Mineral (Cryptocrystalline Quartz)

Jasper (Green variety)

Silicon Dioxide (SiO₂)

sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Jasper with Epidote Vein

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

sedimentary

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

mineral

Amethyst

Silicon dioxide with iron impurities (SiO2 + Fe3+)

mineral

Chalcedony or Chert/Jasper with secondary mineral staining

SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.

Mineral, potentially a rock with chalcedony/jasper.

Hematite

Hematite (Iron(III) oxide, Fe2O3)

mineral

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sedimentary rock