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

Rhyolite (Extrusive felsic igneous rock) — igneous

Rhyolite

Extrusive felsic igneous rock

Rhyolite (Extrusive Felsic Igneous Rock) — igneous

Rhyolite

Extrusive Felsic Igneous Rock

Rhyolite Porphyry (Porphyritic Rhyolite) — igneous

Rhyolite Porphyry

Porphyritic Rhyolite

Gabbro (Coarse-grained mafic intrusive igneous rock) — igneous

Gabbro

Coarse-grained mafic intrusive igneous rock

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)

Rhyolite pebble (likely flow-banded rhyolite) (Rhyolite; fine-grained, silica-rich volcanic rock, typically quartz and alkali feldspar) — igneous

Rhyolite pebble (likely flow-banded rhyolite)

Rhyolite; fine-grained, silica-rich volcanic rock, typically quartz and alkali feldspar

Porphyritic rhyolite (likely pink feldspar-rich volcanic rock) (Rhyolite, composed mainly of quartz and feldspar; exact identification needs closer examination) — igneous

Porphyritic rhyolite (likely pink feldspar-rich volcanic rock)

Rhyolite, composed mainly of quartz and feldspar; exact identification needs closer examination

Quartzite (Quartzite (SiO2 equivalent)) — metamorphic

Quartzite

Quartzite (SiO2 equivalent)

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

Porphyritic Andesite

Andesite (Intermediate Volcanic Rock)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

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

Gabbro Pebble (Polished Beach/River Stone)

Gabbro

Dark, coarse-grained rock (likely gabbro) (Gabbro, a mafic intrusive igneous rock) — igneous

Dark, coarse-grained rock (likely gabbro)

Gabbro, a mafic intrusive igneous rock

Gabbro (Mafic intrusive igneous rock) — igneous

Gabbro

Mafic intrusive igneous rock

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

Gabbro (Mafic Intrusive Igneous Rock) — igneous

Gabbro

Mafic Intrusive Igneous Rock

Gabbro (Gabbro) — igneous

Gabbro

Gabbro

Porphyritic Rhyolite (Porphyritic Rhyolite (SiO2)) — igneous

Porphyritic Rhyolite

Porphyritic Rhyolite (SiO2)

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

Rhyolite

Rhyolite (felsic extrusive igneous rock)

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

Rhyolite (Extrusive felsic igneous rock) — igneous

Rhyolite

Extrusive felsic igneous rock

Rhyolite (Extrusive felsic igneous rock) — igneous

Rhyolite

Extrusive felsic igneous rock

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

Gabbro (Stream-rounded Pebble)

Gabbro (Phaneritic Mafic Igneous Rock)

Diabase (Diabase (Dolerite)) — igneous

Diabase

Diabase (Dolerite)

Gabbro (Plagioclase-pyroxene intrusive igneous rock) — igneous

Gabbro

Plagioclase-pyroxene intrusive igneous rock

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

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

Amethyst

Quartz (Silicon Dioxide, SiO2)

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)

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

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)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Emerald in Matrix

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

Rhyolite (Extrusive igneous rock) — igneous

Rhyolite

Extrusive igneous rock

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

Geode (Quartz / Chalcedony Geode)

SiO2 (Silicon Dioxide)

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

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

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

Pink granite

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