Rock Identifier

Category

Igneous And Metamorphic Derivative (Weathered)

Browse igneous and metamorphic derivative (weathered) specimens identified by the Rock Identifier community.

Learn about Igneous And Metamorphic Derivative (Weathered) in the encyclopedia

Matte Obsidian

Carbonatite

Frosted Obsidian

Cordierite Hornfels

Cordierite Hornfels

Metabasalt

Eulysite

Migmatite

Anthracite

Metaquartzite

Slate

Marble

Hornfels

Almandine Garnet (Almandine - Fe3Al2(SiO4)3) — mineral

Almandine Garnet

Almandine - Fe3Al2(SiO4)3

Agate (Silicon Dioxide (Chalcedony), SiO2) — gemstone

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz pebble (likely milky quartz) (Quartz, SiO₂) — mineral

Quartz pebble (likely milky quartz)

Quartz, SiO₂

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Quartz vein in weathered host rock (Milky quartz (SiO₂), likely in a granitic or metamorphic matrix) — mineral

Quartz vein in weathered host rock

Milky quartz (SiO₂), likely in a granitic or metamorphic matrix

Iron-stained quartz (likely quartz-rich vein rock) (Quartz, SiO₂, with iron-oxide/hydroxide staining (limonite/goethite)) — mineral

Iron-stained quartz (likely quartz-rich vein rock)

Quartz, SiO₂, with iron-oxide/hydroxide staining (limonite/goethite)

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

Quartz with iron staining

Silicon dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Sand (Construction Grade) (Unconsolidated siliciclastic sediment (primarily SiO2)) — sedimentary

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Black Spinel (Magnesium Aluminum Oxide (MgAl2O4)) — mineral

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Weathered granite or granitic gneiss (Granite; chiefly quartz, feldspar, and biotite/hornblende) — igneous

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and biotite/hornblende

Weathered granite or granitic gneiss cobble (Granite; chiefly quartz, feldspar, and mica/amphibole) — igneous

Weathered granite or granitic gneiss cobble

Granite; chiefly quartz, feldspar, and mica/amphibole

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Rounded quartz-rich cobble, likely granite-derived stone (Granite or granitic gneiss, composed mainly of quartz, feldspar, and minor mica) — igneous

Rounded quartz-rich cobble, likely granite-derived stone

Granite or granitic gneiss, composed mainly of quartz, feldspar, and minor mica

Tumbled milky quartz pebble (Quartz (SiO₂), likely massive milky quartz) — mineral

Tumbled milky quartz pebble

Quartz (SiO₂), likely massive milky quartz

Likely weathered granite or granitic gneiss (Granite/granitic gneiss, composed mainly of quartz, feldspar, and mica; exact identification is uncertain from the photograph) — igneous

Likely weathered granite or granitic gneiss

Granite/granitic gneiss, composed mainly of quartz, feldspar, and mica; exact identification is uncertain from the photograph

Almandine Garnet (Almandine (Fe3Al2(SiO4)3)) — mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Sea stack (Likely resistant basaltic to andesitic volcanic rock) — igneous

Sea stack

Likely resistant basaltic to andesitic volcanic rock

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Rounded quartz pebble (Quartz (silicon dioxide, SiO₂)) — mineral

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Granite Pebble (Granite (plutonic felsic intrusive rock)) — igneous

Granite Pebble

Granite (plutonic felsic intrusive rock)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, possibly quartzite or quartz vein fragment (Quartzite (mostly microcrystalline SiO₂), identification uncertain from image) — metamorphic

Weathered quartz-rich rock, possibly quartzite or quartz vein fragment

Quartzite (mostly microcrystalline SiO₂), identification uncertain from image

Likely quartz pebble or quartz fragment (Quartz, SiO₂ (identification from the photo is tentative)) — mineral

Likely quartz pebble or quartz fragment

Quartz, SiO₂ (identification from the photo is tentative)

Likely rough quartz crystal (Quartz (silicon dioxide, SiO₂)) — mineral

Likely rough quartz crystal

Quartz (silicon dioxide, SiO₂)

Moonstone (Orthoclase Feldspar ((Na,K)AlSi3O8)) — mineral

Moonstone

Orthoclase Feldspar ((Na,K)AlSi3O8)

Almandine Garnet (Almandine, Fe3Al2(SiO4)3) — mineral

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Banded gneiss (Gneiss, commonly quartz–feldspar–biotite gneiss) — metamorphic

Banded gneiss

Gneiss, commonly quartz–feldspar–biotite gneiss

Rounded weathered pebble, likely basaltic or metamorphic (Indeterminate fine-grained mafic rock; possibly basalt or altered basalt) — igneous

Rounded weathered pebble, likely basaltic or metamorphic

Indeterminate fine-grained mafic rock; possibly basalt or altered basalt

Likely weathered basalt or dark metamorphic rock (Fine-grained mafic rock, probably basalt (plagioclase + pyroxene ± olivine)) — igneous

Likely weathered basalt or dark metamorphic rock

Fine-grained mafic rock, probably basalt (plagioclase + pyroxene ± olivine)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz (Smoky Quartz variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Diorite (Porphyritic) / Granite (Plutonic Igneous Rock (Granodiorite / Diorite)) — igneous

Diorite (Porphyritic) / Granite

Plutonic Igneous Rock (Granodiorite / Diorite)

Milky quartz (likely quartz crystal fragment) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Foliated Gneiss (River-Worn Pebble) (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Weathered mafic rock, likely basalt or gabbro (Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, with possible olivine and magnetite) — igneous

Weathered mafic rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, with possible olivine and magnetite

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)