Rock Identifier

Category

Sedimentary (Secondary Formation)

Browse sedimentary (secondary formation) specimens identified by the Rock Identifier community.

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Lepidolite (likely) (K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)) — Mineral

Lepidolite (likely)

K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)

Red Jasper (Tumbled) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary/mineral

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary/mineral

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Red Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Red Jasper

Microcrystalline Quartz (SiO2)

Small yellow-brown stone, possibly iron-stained quartz or chert (Undetermined; visual evidence is insufficient for a confident identification) — mineral

Small yellow-brown stone, possibly iron-stained quartz or chert

Undetermined; visual evidence is insufficient for a confident identification

Rounded quartz-rich pebble, possibly chert or weathered sandstone (Indeterminate siliciclastic rock; likely microcrystalline quartz (SiO₂) or quartz-feldspar sandstone) — sedimentary

Rounded quartz-rich pebble, possibly chert or weathered sandstone

Indeterminate siliciclastic rock; likely microcrystalline quartz (SiO₂) or quartz-feldspar sandstone

Red Quartz (Silicon Dioxide (SiO2) with hematite inclusions) — mineral

Red Quartz

Silicon Dioxide (SiO2) with hematite inclusions

Weathered granitoid (likely granite or granodiorite) (Granite–granodiorite; primarily quartz, feldspar, and mica) — igneous

Weathered granitoid (likely granite or granodiorite)

Granite–granodiorite; primarily quartz, feldspar, and mica

Weathered iron-rich concretion or sedimentary rock (Likely ferruginous sandstone or ironstone concretion; exact identification is not possible from the image alone) — sedimentary

Weathered iron-rich concretion or sedimentary rock

Likely ferruginous sandstone or ironstone concretion; exact identification is not possible from the image alone

Green calcite-bearing rock (likely calcite on a pale matrix) (Calcite, CaCO₃; exact matrix and green coloring cannot be determined from the image) — mineral

Green calcite-bearing rock (likely calcite on a pale matrix)

Calcite, CaCO₃; exact matrix and green coloring cannot be determined from the image

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Silicon dioxide (SiO2)) — sedimentary

Chert

Silicon dioxide (SiO2)

Sandstone (with Iron Staining) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Limestone Pebble (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Shale (with Iron Staining) (Argillaceous mudstone / Shale) — sedimentary

Shale (with Iron Staining)

Argillaceous mudstone / Shale

Dyed Agate (Silicon Dioxide (SiO2) - variety Chalcedony) — mineral

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Boxwork Quartz / Septarian Jasper (Boxwork (SiO2 with iron oxide inclusions)) — metamorphic

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Quartz with iron staining (Silicon dioxide (SiO2)) — mineral

Quartz with iron staining

Silicon dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2) in Geodic Cavity) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in Geodic Cavity

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Jasper with Quartz Vein (Silicon Dioxide (SiO2)) — sedimentary

Jasper with Quartz Vein

Silicon Dioxide (SiO2)

Yellow Ochre (Limonite) (Limonite (FeO(OH)qnH2O)) — sedimentary

Yellow Ochre (Limonite)

Limonite (FeO(OH)qnH2O)

Agate (Cryptocrystalline Silicon Dioxide (SiO2)) — mineral

Agate

Cryptocrystalline Silicon Dioxide (SiO2)

Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Red Jasper (Polished) (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Red Jasper (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Quartz Crystal Cluster (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Milky Quartz Nodule / Geode precursor (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Nodule / Geode precursor

Silicon Dioxide (SiO2)

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Orange Calcite point (Calcite (Calcium Carbonate, CaCO3)) — mineral

Orange Calcite point

Calcite (Calcium Carbonate, CaCO3)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Red Jasper (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Turquoise (Rough) (Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise (Rough)

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Chert (Jasper/Flint variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)