Schist
Mica Schist (primarily Muscovite and Biotite)
metamorphic
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Quartz / Quartzite
Silicon Dioxide (SiO2)
Metamorphic or Mineral
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Ferruginous Sandstone (Gozzan/Ironstone)
Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)
sedimentary
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Native Sulfur
Sulfur (S8)
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Pegmatite
Granitic Pegmatite
igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Amber
Succinite (fossilized tree resin), C10H16O
Organic Gemstone
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Gneiss
Gneiss
metamorphic
Epidote
Epidote - Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)
igneous
Limonite (Pseudomorph after Pyrite/Marcasite)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Schist with Quartz/Mica
Mica Schist (primarily Muscovite and Quartz)
Metamorphic
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Nuummite
Nuummite (mixture of Anthophyllite and Gedrite)
metamorphic
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Jasper (specifically Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Yellow Quartz or Citrine
Silicon Dioxide (SiO2)
mineral
Amethyst (Chevron Amethyst)
Amethystine Quartz (SiO2)
mineral
Amethyst or Smoky Quartz Geode Slice
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral