Rock Identifier

Category

Sedimentary (Secondary Formation)

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

Jasper Breccia (Silicon Dioxide (SiO2) with iron inclusions) — sedimentary

Jasper Breccia

Silicon Dioxide (SiO2) with iron inclusions

Chert (Flint / Quartz Nodule) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint / Quartz Nodule)

Microcrystalline Quartz (SiO2)

Jasper and Chalcedony (Silicon Dioxide (SiO2) microcrystalline quartz) — sedimentary

Jasper and Chalcedony

Silicon Dioxide (SiO2) microcrystalline quartz

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

Botryoidal Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Limonite (Hydrated Iron Oxide / Bog Iron) (FeO(OH)·nH2O) — Mineral (Sedimentary context)

Limonite (Hydrated Iron Oxide / Bog Iron)

FeO(OH)·nH2O

Mineral (Sedimentary context)

Yellow Ocherous Siltstone (Limonitic Shale) (Limonitic Siltstone / Goethite-rich Sedimentary Rock) — sedimentary

Yellow Ocherous Siltstone (Limonitic Shale)

Limonitic Siltstone / Goethite-rich Sedimentary Rock

Pyrite-bearing rock (likely pyrite-rich ore) (Pyrite, FeS₂, in a fine-grained host rock) — mineral

Pyrite-bearing rock (likely pyrite-rich ore)

Pyrite, FeS₂, in a fine-grained host rock

White/green translucent tumbled mineral fragment (Likely calcite (CaCO₃), possibly fluorite (CaF₂) or glass-like feldspar; visual identification is uncertain) — mineral

White/green translucent tumbled mineral fragment

Likely calcite (CaCO₃), possibly fluorite (CaF₂) or glass-like feldspar; visual identification is uncertain

Weathered yellow-brown rock fragment (Indeterminate; possibly iron-stained sandstone or weathered limestone) — sedimentary

Weathered yellow-brown rock fragment

Indeterminate; possibly iron-stained sandstone or weathered limestone

Small weathered rock fragment (Indeterminate; possibly carbonate-rich sandstone or limestone) — sedimentary

Small weathered rock fragment

Indeterminate; possibly carbonate-rich sandstone or limestone

Quartz with Iron Oxide Inclusions (SiO2) — mineral

Quartz with Iron Oxide Inclusions

SiO2

Milky calcite (Calcite (calcium carbonate, CaCO₃)) — mineral

Milky calcite

Calcite (calcium carbonate, CaCO₃)

Small tan rock fragment (Indeterminate; possibly quartz-rich sandstone or iron-stained quartz) — mineral

Small tan rock fragment

Indeterminate; possibly quartz-rich sandstone or iron-stained quartz

Mixed mineral and rock collection (Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones) — mineral

Mixed mineral and rock collection

Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones

Milky Quartz (SiO2 (Silicon Dioxide)) — mineral

Milky Quartz

SiO2 (Silicon Dioxide)

Limonite (Iron Ore) (Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)

Quartz-bearing dark rock, possibly hornfels or basalt (Probable quartz–feldspar rock; exact identification requires testing) — metamorphic

Quartz-bearing dark rock, possibly hornfels or basalt

Probable quartz–feldspar rock; exact identification requires testing

Chert (likely flint) (Microcrystalline quartz, SiO₂) — sedimentary

Chert (likely flint)

Microcrystalline quartz, SiO₂

Tumbled brown translucent mineral fragment (Indeterminate; possibly quartz/chalcedony or weathered feldspar) — mineral

Tumbled brown translucent mineral fragment

Indeterminate; possibly quartz/chalcedony or weathered feldspar

Small translucent mineral fragment, possibly calcite or quartz (Probable calcite (CaCO₃) or quartz (SiO₂); image resolution prevents confident separation) — mineral

Small translucent mineral fragment, possibly calcite or quartz

Probable calcite (CaCO₃) or quartz (SiO₂); image resolution prevents confident separation

Weathered brown stone, possibly chert or iron-stained limestone (Uncertain; likely microcrystalline quartz (SiO₂) chert or calcitic limestone (CaCO₃)) — sedimentary

Weathered brown stone, possibly chert or iron-stained limestone

Uncertain; likely microcrystalline quartz (SiO₂) chert or calcitic limestone (CaCO₃)

Unidentified small rock fragment (Likely quartz-rich material; exact identification is indeterminate from the image) — mineral

Unidentified small rock fragment

Likely quartz-rich material; exact identification is indeterminate from the image

Chert (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert

Chert (Microcrystalline Quartz, SiO2)

Unidentified gray-brown stone (Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image) — mineral

Unidentified gray-brown stone

Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image

Iron-stained weathered stone (tentative) (Undetermined; possibly weathered iron-rich basalt or concretion) — mineral

Iron-stained weathered stone (tentative)

Undetermined; possibly weathered iron-rich basalt or concretion

Feldspar (specifically Orthoclase or Plagioclase) (Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate) — mineral

Feldspar (specifically Orthoclase or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Unidentifiable Rock Fragment — Uncertain

Unidentifiable Rock Fragment

Quartz Geode (Silicon Dioxide (SiO2) within Sedimentary host rock) — mineral

Quartz Geode

Silicon Dioxide (SiO2) within Sedimentary host rock

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

Turquoise

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

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Limonite (Iron Ore) (Limonite; FeO(OH)·nH2O) — mineral

Limonite (Iron Ore)

Limonite; FeO(OH)·nH2O

Chalcedony (Yellow/Honey variety) (Microcrystalline Quartz (SiO2)) — mineral

Chalcedony (Yellow/Honey variety)

Microcrystalline Quartz (SiO2)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Aragonite Star Cluster (Aragonite (Calcium Carbonate - CaCO3)) — mineral

Aragonite Star Cluster

Aragonite (Calcium Carbonate - CaCO3)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

sedimentary/mineral

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

Turquoise

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

Red Jasper (possibly with Quartz or Hematite) (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary or metamorphic

Red Jasper (possibly with Quartz or Hematite)

Silicon Dioxide (SiO2) with iron oxide impurities

sedimentary or metamorphic

Turquoise (CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Limonite (Iron Stone/Iron Ore) (FeO(OH)·nH2O (Hydrous ferric oxide)) — mineral

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)