Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Graphite
Graphite (C)
mineral
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Hematite / Jasper
Iron(III) oxide (Fe2O3) in Quartz (SiO2)
mineral / sedimentary
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Mineral
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Yellow Quartz Pebble
SiO2 (Silicon Dioxide) with Iron Impurities
mineral
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded Agate (Lace Agate)
Agate (Variety of Cryptocrystalline Quartz), SiO2
mineral
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Petrified Wood
Silicified wood (Quartz, SiO2)
metamorphic
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Green Quartzite (or Green Jasper)
Silica (Silicon Dioxide, SiO2) with inclusions
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Gossan (Iron Hat)
Limonitic Gossan (Fe-oxide/hydroxide complex)
igneous
Common Opal
Amorphous Hydrated Silica (SiO2·nH2O)
mineral
Tiger's Eye (Oeil de Tigre)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Citrine
SiO2 (Silicon Dioxide)
mineral
Prasiolite
Silicon Dioxide (SiO2)
mineral
Banded Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Gold
Native Gold (Au)
mineral
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Chrysocolla (on host rock)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Copper silicate)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Agate (Geode nodule)
Cryptocrystalline Quartz (SiO2)
mineral
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Orange Quartz (Citrine Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Labradorite
Labradorite, (Ca, Na)(Al, Si)4O8
mineral
River Pebble (Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral