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

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

Weathered granite or granitic gneiss cobble

Granite; primarily quartz, feldspar, and mica

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

Quartz (Agate/Jasper pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Agate/Jasper pebble)

Silicon Dioxide (SiO2)

Moonstone (Orthoclase (KAlSi3O8) or Oligoclase with adularescence) — gemstone

Moonstone

Orthoclase (KAlSi3O8) or Oligoclase with adularescence

Agate (Banded Chalcedony (SiO2 - Silicon Dioxide)) — mineral

Agate

Banded Chalcedony (SiO2 - Silicon Dioxide)

River Gravel (Polymictic gravel and pebble aggregate) — sedimentary

River Gravel

Polymictic gravel and pebble aggregate

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Coarse Sand or Fine Gravel (Detrital Sedimentary Fragments (mostly SiO2)) — sedimentary

Coarse Sand or Fine Gravel

Detrital Sedimentary Fragments (mostly SiO2)

Quartz Mineral (Silicon Dioxide (SiO2)) — mineral

Quartz Mineral

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Serpentine (Serpentinite) (Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)) — metamorphic

Serpentine (Serpentinite)

Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)

Raw quartz crystal (Quartz (silicon dioxide, SiO₂)) — mineral

Raw quartz crystal

Quartz (silicon dioxide, SiO₂)

Weathered granite or granitic gneiss fragments (Granite; primarily quartz, feldspar, and mica (composition uncertain from image)) — igneous

Weathered granite or granitic gneiss fragments

Granite; primarily quartz, feldspar, and mica (composition uncertain from image)

Nephrite Jade (Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Black Tourmaline (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartz-rich cobble, possibly granitic gneiss (Probable quartz–feldspar–mica aggregate; exact lithology uncertain from image) — igneous

Weathered quartz-rich cobble, possibly granitic gneiss

Probable quartz–feldspar–mica aggregate; exact lithology uncertain from image

Black Tourmaline (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Basalt Pebble (Extrusive mafic igneous rock) — igneous

Basalt Pebble

Extrusive mafic igneous rock

Gold Ore in Matrix (Native Gold (Au) in Quartz/Limonite host rock) — mineral

Gold Ore in Matrix

Native Gold (Au) in Quartz/Limonite host rock

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

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered granitoid (likely granite or granitic gneiss) (Granite; chiefly quartz, feldspar, and mica (exact identification uncertain from the photo)) — igneous

Weathered granitoid (likely granite or granitic gneiss)

Granite; chiefly quartz, feldspar, and mica (exact identification uncertain from the photo)

Pyrite Cube in Matrix (Iron Sulfide (FeS2)) — mineral

Pyrite Cube in Matrix

Iron Sulfide (FeS2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Gravel (Crushed Stone Aggregates) (Mixed Siliciclastic / Carbonate Aggregate) — sedimentary

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Gold (Native gold (Au)) — mineral

Gold

Native gold (Au)

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

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Black Sand (Magnetite Sand) (Magnetite (Fe3O4)) — mineral

Black Sand (Magnetite Sand)

Magnetite (Fe3O4)

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

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartz-rich pegmatite (Pegmatitic granite, chiefly quartz (SiO₂), feldspar, and minor mica/iron-oxide staining) — igneous

Quartz-rich pegmatite

Pegmatitic granite, chiefly quartz (SiO₂), feldspar, and minor mica/iron-oxide staining

Magnetite (potentially as a Lodestone or within Ironstone) (Magnetite (Fe3O4)) — mineral

Magnetite (potentially as a Lodestone or within Ironstone)

Magnetite (Fe3O4)

Basalt with Weathered Surface (Basalt) — Igneous

Basalt with Weathered Surface

Basalt

Magnetite (Magnetite (Fe3O4)) — Mineral

Magnetite

Magnetite (Fe3O4)

Granite Pebble (Granite (Phaneritic Igneous Rock)) — igneous

Granite Pebble

Granite (Phaneritic Igneous Rock)

White Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

White Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Weathered granite or granitic gneiss pebble (Granite; primarily quartz, potassium feldspar, plagioclase, and mica) — igneous

Weathered granite or granitic gneiss pebble

Granite; primarily quartz, potassium feldspar, plagioclase, and mica

Slate (Metamorphic Mudstone / Shale) — metamorphic

Slate

Metamorphic Mudstone / Shale