Rock Identifier

Category

Metamorphic Rock (Primarily Composed Of Minerals)

Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.

Chert (Nodule) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Zoisite with Ruby (Anyolite) (Anyolite (Ca2Al3(SiO4)3(OH) + (Hb, Al, Cr)2O3)) — metamorphic

Zoisite with Ruby (Anyolite)

Anyolite (Ca2Al3(SiO4)3(OH) + (Hb, Al, Cr)2O3)

Quartz (specifically Citrine or Yellow Quartzite pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Citrine or Yellow Quartzite pebble)

Silicon Dioxide (SiO2)

Burmese Jadeite (Water Jade) (Jadeite (NaAlSi2O6)) — metamorphic

Burmese Jadeite (Water Jade)

Jadeite (NaAlSi2O6)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Shale (or Mudstone) (Siltstone/Argillite (composed mainly of clay and silt-sized particles)) — sedimentary

Shale (or Mudstone)

Siltstone/Argillite (composed mainly of clay and silt-sized particles)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Basalt River Cobble (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)

Nuummite (Nuummite (mixture of Anthophyllite and Gedrite)) — metamorphic

Nuummite

Nuummite (mixture of Anthophyllite and Gedrite)

Prehnite (Prehnite - Ca2Al(AlSi3O10)(OH)2) — mineral

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Muscovite (Mica) in Quartz Matrix (Muscovite (KAl2(AlSi3O10)(OH)2) and Quartz (SiO2)) — mineral

Muscovite (Mica) in Quartz Matrix

Muscovite (KAl2(AlSi3O10)(OH)2) and Quartz (SiO2)

Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right) (Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)) — mineral

Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)

Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)

Yellow Citrine Quartz (Silicon Dioxide (SiO₂)) — mineral

Yellow Citrine Quartz

Silicon Dioxide (SiO₂)

Bornite (Peacock Ore) (Bornite (Cu5FeS4)) — mineral

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Quartz (milky quartz variety) (Quartz (SiO₂)) — Mineral

Quartz (milky quartz variety)

Quartz (SiO₂)

Gold Ore in Matrix (Native Gold (Au) in Quartz/Host Rock) — mineral

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Jadeite (Jade) (Jadeite; NaAlSi2O6) — metamorphic

Jadeite (Jade)

Jadeite; NaAlSi2O6

Schist (Lepidoblastic Mica Schist) — metamorphic

Schist

Lepidoblastic Mica Schist

Breciated Limestone with Calcite Veins (Sedimentary Breccia (CaCO3)) — sedimentary

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

Quartz (Milky/Bull Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Specular Hematite (Specularite) (Hematite (Alpha-Fe2O3)) — mineral

Specular Hematite (Specularite)

Hematite (Alpha-Fe2O3)

Aventurine (Silicon Dioxide (SiO2 with inclusions of Fuchsite mica)) — mineral

Aventurine

Silicon Dioxide (SiO2 with inclusions of Fuchsite mica)

Quartz / Common Opal Transition (Silicon Dioxide (SiO2)) — mineral

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

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

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Quartzite (River Cobble) (SiO2 (Quartz-rich Metamorphic Rock)) — metamorphic

Quartzite (River Cobble)

SiO2 (Quartz-rich Metamorphic Rock)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Amethyst (Silicon Dioxide with Iron impurities (SiO2)) — mineral

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Green Aventurine (SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)) — mineral

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)

Granite (Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)) — Igneous

Granite

Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)

Druzy Quartz (on Chalcedony/Agate base) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Rough Diamond (Diamond (pure Carbon, C)) — mineral

Rough Diamond

Diamond (pure Carbon, C)

Gneiss (specifically a water-worn pebble) (Gneiss) — metamorphic

Gneiss (specifically a water-worn pebble)

Gneiss

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Druzy Quartz Geode (Oco or Moroccan variety) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz Geode (Oco or Moroccan variety)

Silicon Dioxide (SiO2)

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

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Granite (Granite (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)) — igneous

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)

Granite (Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Amethyst Quartz Druse (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst Quartz Druse

Silicon Dioxide (SiO2) with iron impurities

Dragon Blood Jasper (Epidote with Pietersite or Red Jasper (Silicate mineral)) — metamorphic

Dragon Blood Jasper

Epidote with Pietersite or Red Jasper (Silicate mineral)

Sandstone (Ferruginous) (Arenite (SiO2 with Fe2O3 inclusions)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)