Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Rhodonite
Rhodonite (MnSiO3)
mineral
Greenschist
Greenschist (comprising Actinolite, Chlorite, and Epidote)
metamorphic
Dalmation Stone
Peralkaline Rock (mixed silicate minerals)
igneous
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Chlorite (Small Flakes/Sand)
Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
mineral
Garden Quartz (Lodolite)
Quartz with inclusions (SiO2 + various inclusions such as Chlorite, Hematite, or Feldspar)
mineral
Quartz (various varieties)
SiO₂ (Silicon Dioxide)
Mineral
![Biotite (Black Mica) (Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]) — mineral](https://media.rockidentification.com/d0934b7d-e62f-4dc8-b96a-f7847d366a58-thumbnail.jpg)
Biotite (Black Mica)
Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]
mineral
Septarian Nodule (Dragon Stone)
Septarian (composed of Calcite CaCO3, Aragonite CaCO3, and Limestone/Clay)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).
Mineral
Crushed Granite Gravel
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Moonstone (Feldspar)
Orthoclase feldspar, (K,Na)AlSi3O8
mineral
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Schist
Mica Schist
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
River Rock (likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
Blue Quartz
Quartz (Silicon Dioxide) with blue inclusions (SiO2)
mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
metamorphic
Mica Schist
Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Basalt
Extrusive mafic igneous rock
igneous
Dumortierite Quartz (Blue Quartz)
Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium aluminum silicate)
mineral
Granite Pebble
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Mica)
igneous
Jadeite Jade
Jadeite (NaAlSi2O6)
metamorphic
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Pyrite in Shale
Iron Sulfide (FeS2)
mineral
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary