Red Jasper (beads)
Silicon Dioxide (SiO2) with iron inclusions
Sedimentary Rock
Category
Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)
Browse sedimentary rock (possibly a conglomerate or coarse grained sandstone) specimens identified by the Rock Identifier community.
Chalk
Calcareous Ooze (composed primarily of coccoliths)
Sedimentary Rock
Puddingstone
Conglomerate
Sedimentary
Quartz (in matrix)
Quartz (SiO₂)
mineral
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)
Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)
Mineral for Fluorite; Mineral/Rock for Jadeite (as it's often a rock composed primarily of jadeite mineral)
Quartz
Quartz (SiO2)
Mineral
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Puddingstone (Gowganda Tillite/Lorrain Quartzite)
Jasper Conglomerate
sedimentary
Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Chalcedony (Banded/Mottled Variety)
Chalcedony (a cryptocrystalline variety of Quartz, SiO2)
Mineral
Chert (Jasper or Flint variant)
Chert (composed of microcrystalline quartz, SiO2)
sedimentary
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Clear Quartz (beads in a bracelet)
Quartz (SiO2)
Mineral
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Granite (phaneritic background) with Limestone/Calcite carving
Felsic Igneous Plutonic Rock (background) / Calcium Carbonate (CaCO3) (carving)
igneous and sedimentary
Chert (Flint)
SiO2 (predominantly microcrystalline or cryptocrystalline quartz)
Sedimentary rock
Biotite or Phlogopite Mica
K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Quartz Geode/Cluster
Quartz (SiO2)
mineral
Red Jasper (beads)
SiO₂ (Silicon Dioxide)
Mineral, variety of chalcedony (microcrystalline quartz)
Quartz (pebble)
Quartz (SiO₂)
Mineral
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Orthoclase Feldspar (or K-Feldspar)
Orthoclase (KAlSi3O8)
Mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Amber with inclusion
Amber (Fossilized Tree Resin)
mineral
Quartzite
SiO2 (Crystalline Quartz)
metamorphic
Chert (Arrowhead Fragment)
Chert / Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Banded Gneiss
Gneiss (pronounced "nice")
Metamorphic Rock
Chert Breccia
Brecciated Chert (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert or Flint (polished/water-worn)
Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.
Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)