Rock Identifier

Category

Mineral Equivalent

Browse mineral equivalent specimens identified by the Rock Identifier community.

Learn about Mineral Equivalent in the encyclopedia

Ijolite

Glauconite

Hutcheonite

Halite

Sperrylite

Baddeleyite

Anatase

Brookite

Talc

Euxenite

Eltyubyuite

Buergerite

Stainless Steel (Polished) (Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)) — Mineral equivalent / Metal Alloy

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Mineral equivalent / Metal Alloy

Diabase (Dolerite) (Diabase or Dolerite) — igneous

Diabase (Dolerite)

Diabase or Dolerite

Gabbro with Quartz Vein (Gabbro (mafic intrusive igneous rock)) — igneous

Gabbro with Quartz Vein

Gabbro (mafic intrusive igneous rock)

Rhyolite (Extrusive igneous rock (felsic)) — igneous

Rhyolite

Extrusive igneous rock (felsic)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Porphyritic Andesite (Andesite (Intermediate Volcanic Rock)) — igneous

Porphyritic Andesite

Andesite (Intermediate Volcanic Rock)

Gabbro Pebble (Polished Beach/River Stone) (Gabbro) — igneous

Gabbro Pebble (Polished Beach/River Stone)

Gabbro

Dark mafic igneous rock, likely basalt or gabbro (Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine) — igneous

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine

Quartzite (Quartzite (SiO2 equivalent)) — metamorphic

Quartzite

Quartzite (SiO2 equivalent)

Rhyolite (Rhyolite (felsic extrusive igneous rock)) — igneous

Rhyolite

Rhyolite (felsic extrusive igneous rock)

Porphyritic Rhyolite (Porphyritic Rhyolite (SiO2)) — igneous

Porphyritic Rhyolite

Porphyritic Rhyolite (SiO2)

Gabbro (Indigo Gabbro) (Gabbro (mafic intrusive igneous rock)) — igneous

Gabbro (Indigo Gabbro)

Gabbro (mafic intrusive igneous rock)

Gabbro (Water-worn Pebble) (Gabbro) — igneous

Gabbro (Water-worn Pebble)

Gabbro

Gabbro (Gabbro) — igneous

Gabbro

Gabbro

Amethyst (Quartz (Silicon Dioxide, SiO2)) — gemstone

Amethyst

Quartz (Silicon Dioxide, SiO2)

Gabbro (Stream-rounded Pebble) (Gabbro (Phaneritic Mafic Igneous Rock)) — igneous

Gabbro (Stream-rounded Pebble)

Gabbro (Phaneritic Mafic Igneous Rock)

Polished black-and-white stone, likely gabbro or diorite (Gabbro/diorite; chiefly plagioclase feldspar, pyroxene, and possibly amphibole or biotite) — igneous

Polished black-and-white stone, likely gabbro or diorite

Gabbro/diorite; chiefly plagioclase feldspar, pyroxene, and possibly amphibole or biotite

Rhyolite (possibly porphyritic and altered) (Volcanic felsic rock; primarily quartz, alkali feldspar, plagioclase, and volcanic glass, with iron-oxide alteration) — igneous

Rhyolite (possibly porphyritic and altered)

Volcanic felsic rock; primarily quartz, alkali feldspar, plagioclase, and volcanic glass, with iron-oxide alteration

Gabbro (Plagioclase-pyroxene intrusive igneous rock) — igneous

Gabbro

Plagioclase-pyroxene intrusive igneous rock

Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

Gabbro (Water-Worn Pebble) (Gabbro (Plagioclase Feldspar and Pyroxene)) — igneous

Gabbro (Water-Worn Pebble)

Gabbro (Plagioclase Feldspar and Pyroxene)

Granite (Coarse-grained granitic rock, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole) — igneous

Granite

Coarse-grained granitic rock, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole

Gabbro (River Cobble) (Gabbro (mafic intrusive rock)) — igneous

Gabbro (River Cobble)

Gabbro (mafic intrusive rock)

Emerald in Matrix (Emerald (Beryllium Aluminum Silicate - Be3Al2(SiO3)6)) — mineral

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate - Be3Al2(SiO3)6)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Gabbro (likely olivine-bearing) (Coarse-grained mafic intrusive rock; chiefly plagioclase feldspar and pyroxene, possibly olivine) — igneous

Gabbro (likely olivine-bearing)

Coarse-grained mafic intrusive rock; chiefly plagioclase feldspar and pyroxene, possibly olivine

Pink granite (Granite; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende) — igneous

Pink granite

Granite; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Geode (Quartz / Chalcedony Geode) (SiO2 (Silicon Dioxide)) — sedimentary

Geode (Quartz / Chalcedony Geode)

SiO2 (Silicon Dioxide)

Dark coarse-grained rock, likely gabbro or amphibolite (Gabbro (plutonic mafic rock; mainly plagioclase and pyroxene), possibly amphibolite if metamorphosed) — igneous

Dark coarse-grained rock, likely gabbro or amphibolite

Gabbro (plutonic mafic rock; mainly plagioclase and pyroxene), possibly amphibolite if metamorphosed

Gabbro (Gabbro (Coarse-grained Mafic Igneous Rock)) — igneous

Gabbro

Gabbro (Coarse-grained Mafic Igneous Rock)

Rhyolite with Lithophysae and Iron Oxide (Extrusive igneous rock / Felsic volcanic rock) — igneous

Rhyolite with Lithophysae and Iron Oxide

Extrusive igneous rock / Felsic volcanic rock

Black-and-copper polished granite (Biotite granite, likely a commercial gabbro/granite variety) — igneous

Black-and-copper polished granite

Biotite granite, likely a commercial gabbro/granite variety

Gabbro (Phaneritic Mafic Plutonic Rock) — igneous

Gabbro

Phaneritic Mafic Plutonic Rock

Weathered iron-rich metamorphic rock, possibly schist or metabasalt (Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing) — metamorphic

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing

Schist (Kyanite Schist) (Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)) — metamorphic

Schist (Kyanite Schist)

Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)

Likely granite or granitic gneiss fragment (Quartz–feldspar–mica aggregate; possibly granitic gneiss) — igneous

Likely granite or granitic gneiss fragment

Quartz–feldspar–mica aggregate; possibly granitic gneiss

Gabbro (Gabbro (Mafic Plutonic Rock)) — igneous

Gabbro

Gabbro (Mafic Plutonic Rock)

Coarse-grained mafic igneous rock, likely gabbro (Gabbro; chiefly calcium-rich plagioclase feldspar and pyroxene, with possible olivine and amphibole) — igneous

Coarse-grained mafic igneous rock, likely gabbro

Gabbro; chiefly calcium-rich plagioclase feldspar and pyroxene, with possible olivine and amphibole

Rhyolite (likely porphyritic) (Rhyolite; chiefly quartz, alkali feldspar, plagioclase, and volcanic glass, with possible iron-oxide staining) — igneous

Rhyolite (likely porphyritic)

Rhyolite; chiefly quartz, alkali feldspar, plagioclase, and volcanic glass, with possible iron-oxide staining

Pink granite (Granite, typically quartz + alkali feldspar + plagioclase + biotite/hornblende) — igneous

Pink granite

Granite, typically quartz + alkali feldspar + plagioclase + biotite/hornblende

Weathered rhyolite or felsic volcanic rock (Rhyolite, commonly quartz–alkali feldspar–plagioclase with iron-oxide alteration) — igneous

Weathered rhyolite or felsic volcanic rock

Rhyolite, commonly quartz–alkali feldspar–plagioclase with iron-oxide alteration

Rhyolite (iron-stained, weathered volcanic rock) (Rhyolite; chiefly quartz and alkali feldspar with minor plagioclase, biotite, and iron oxides) — igneous

Rhyolite (iron-stained, weathered volcanic rock)

Rhyolite; chiefly quartz and alkali feldspar with minor plagioclase, biotite, and iron oxides