Pyrite
Iron Disulfide (FeS2)
mineral
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Likely polished tiger’s-eye with dark matrix
Quartz (SiO₂) with fibrous crocidolite-derived inclusions; possibly an iron-rich jasper or other dark host rock
metamorphic
Halite (Rock Salt)
Sodium Chloride (NaCl)
mineral
Prase quartz with actinolite inclusions
Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions
mineral
Mica Schist
Schist (primarily muscovite and quartz)
metamorphic
Pink Quartzite
Quartzite (SiO2) with trace Iron Oxides
metamorphic
Schist
Mica Schist
metamorphic
Greenstone (Greenschist facies)
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Quartzite river pebble
Quartzite (SiO2)
metamorphic
Fancy Jasper
Silicon Dioxide (SiO2)
sedimentary
Polished tiger’s eye
Quartz (microcrystalline SiO₂) with crocidolite-derived iron oxides
mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
Mineral
Weathered fossil shell or crinoid fragment
Likely fossilized echinoderm or bivalve fragment; exact taxon indeterminate from the image
fossil
Green Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Mixed rounded river pebbles, probably quartz-rich metamorphic and volcanic rocks
Predominantly quartzite/metachert, with possible rhyolite, sandstone, and iron-stained quartz; exact species cannot be determined confidently from the image
rock
Quartz fragment (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Fine-grained dark metamorphic rock, likely slate or phyllite
Slate/phyllite; chiefly quartz, mica, and chlorite
metamorphic
Serpentine
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Mica Schist
Mica Schist
metamorphic
Schist with Quartz/Mica
Mica Schist (primarily Muscovite and Quartz)
Metamorphic
Mica Schist
Schist (primarily Muscovite and Biotite mica)
metamorphic
Yellow Aventurine
Silicon Dioxide (SiO2) with inclusion of Mica
Mineral (Variety of Quartz)
Unakite
Epidotized Granite
metamorphic
Unakite (Epidotized Granite)
Unakite (Rock composed of Epidote Ca2(Al,Fe)3(SiO4)3(OH), Orthoclase KAlSi3O8, and Quartz SiO2)
metamorphic
Unakite
Epidotized Granite
metamorphic
Unakite
Unakite epidotized granite
metamorphic
Unakite
Epidotized Granite
metamorphic
Banded ironstone pebble
Jasper-rich iron formation; chiefly microcrystalline quartz (SiO₂) with iron oxides/hydroxides
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Polished malachite
Malachite, Cu₂CO₃(OH)₂
mineral
Pink quartzite or pink quartz pebble
Quartzite; predominantly silicon dioxide (SiO₂), with iron-bearing impurities or feldspar causing the pink color
metamorphic
Rounded quartz-rich pebbles
Likely quartzite or quartz-rich sandstone; predominantly microcrystalline quartz (SiO₂)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) - Opaque Chalcedony
sedimentary
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Mookaite Jasper
Radiolarite (SiO2 with impurities)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Iron-stained chert or jasper pebble
Microcrystalline quartz (SiO₂), likely hematite/goethite-bearing
sedimentary
Hematite
Hematite (Iron (III) oxide, Fe2O3)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral