Rock Identifier

Category

Sedimentary Or Igneous (Host Environment)

Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.

Learn about Sedimentary Or Igneous (Host Environment) in the encyclopedia

Carbonatite

Emerald in Matrix

Emerald in Matrix

Conglomerate

Aquamarine Matrix

Aquamarine Matrix

Quartzite Sandstone

Quartzite Sandstone

Breccia

Ironstone

Hot Pink Tourmaline

Hot Pink Tourmaline

Lamproite

Pegmatite

Matrix Opal

Troctolite

Weathered brown stone, possibly basalt or iron-rich sedimentary rock (Indeterminate from photograph; likely fine-grained mafic rock (basalt) or ferruginous sandstone) — igneous

Weathered brown stone, possibly basalt or iron-rich sedimentary rock

Indeterminate from photograph; likely fine-grained mafic rock (basalt) or ferruginous sandstone

Banded Gneiss (Gneiss) — metamorphic

Banded Gneiss

Gneiss

Granitoid Gneiss with Feldspar Vein (Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)) — metamorphic

Granitoid Gneiss with Feldspar Vein

Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)

Limestone (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (CaCO3)

Garnet-bearing gneiss (Biotite–garnet gneiss, typically quartz + feldspar + biotite + almandine garnet) — metamorphic

Garnet-bearing gneiss

Biotite–garnet gneiss, typically quartz + feldspar + biotite + almandine garnet

Basalt pebble (Aphanitic Mafic Igneous Rock) — igneous

Basalt pebble

Aphanitic Mafic Igneous 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]

Quartz (Pegmatitic Quartz with Feldspar) (SiO2 (Silicon Dioxide)) — mineral

Quartz (Pegmatitic Quartz with Feldspar)

SiO2 (Silicon Dioxide)

Milky Quartz on Matrix (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz on Matrix

Quartz (Silicon Dioxide, SiO2)

Banded Gneiss / Metamorphic River Pebble (Gneiss (Foliated Metamorphic Rock)) — metamorphic

Banded Gneiss / Metamorphic River Pebble

Gneiss (Foliated Metamorphic Rock)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode (River Cobble) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (River Cobble)

Silicon Dioxide (SiO2)

Banded Agate (Banded Chert / Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Banded Agate (Banded Chert / Jasper)

Silicon Dioxide (SiO2)

Tumbled Chalcedony Pebble (Silicon Dioxide (SiO2)) — mineral

Tumbled Chalcedony Pebble

Silicon Dioxide (SiO2)

Calcite on Host Rock (Calcium Carbonate (CaCO3)) — mineral

Calcite on Host Rock

Calcium Carbonate (CaCO3)

Geode or Concretion (Silica-based Concretion / Quartz Geode) — sedimentary

Geode or Concretion

Silica-based Concretion / Quartz Geode

Quartz (Vein Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Sandstone (with Lichen) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Chert (Jasper-like Silicate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper-like Silicate)

Microcrystalline Quartz (SiO2)

Water and Silt (Sedimentary Environment) (Suspended Sediment / H2O (dihydrogen monoxide)) — sedimentary

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Quartz-Veined Slate or Greenstone (Metamorphic rock with quartz vein (SiO2)) — metamorphic

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Banded Sandstone (Water-worn Pebble) (Arenite with mineral banding) — sedimentary

Banded Sandstone (Water-worn Pebble)

Arenite with mineral banding

Quartz Pebble with Host Rock / Schist Matrix (Silicon Dioxide (SiO2) with Metamorphic Host Rock) — sedimentary

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Small rounded pebble, likely quartz-rich river stone (Indeterminate; likely quartz/chert-bearing lithic clast) — sedimentary

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein) (Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein) — sedimentary

Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)

Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Oyster shell fragment (Ostreidae shell; primarily calcite (CaCO₃)) — fossil

Oyster shell fragment

Ostreidae shell; primarily calcite (CaCO₃)

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

Turquoise

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

Banded River Pebble (Gneiss or Quartz-Veined Basalt) (Polished River Siltstone or Quartzite Gneiss) — metamorphic

Banded River Pebble (Gneiss or Quartz-Veined Basalt)

Polished River Siltstone or Quartzite Gneiss

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz with Hematite/Limonite staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Hematite/Limonite staining

Silicon Dioxide (SiO2)

Fenestella Bryozoan Fossil (Fenestella (class Stenolaemata)) — fossil

Fenestella Bryozoan Fossil

Fenestella (class Stenolaemata)

Rough Ruby (Corundum (Al2O3 with Chromium impurities)) — mineral

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Muscovite Mica (Muscovite / KAl2(AlSi3O10)(OH)2) — mineral

Muscovite Mica

Muscovite / KAl2(AlSi3O10)(OH)2

Weathered sandstone fragment (Quartz-rich sandstone, likely feldspathic or lithic sandstone) — sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, likely feldspathic or lithic sandstone

Citrine (Heat-treated Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Quartz (Milky or Cloudy variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Blue Sapphire (Corundum (Al2O3 with trace Titanium/Iron)) — mineral

Blue Sapphire

Corundum (Al2O3 with trace Titanium/Iron)