Greenstone (Epidisite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)
metamorphic
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Chalcedony (Yellow/Honey variety)
Microcrystalline Quartz (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Jasper (Tumbled)
Silicon Dioxide (SiO₂)
sedimentary (cryptocrystalline quartz)
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide with Iron Oxide (SiO2 with traces of Fe2O3/FeO(OH))
mineral
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Citrine
Silicon Dioxide (SiO2) with iron impurities
Mineral
Ruby in Zoisite with Hornblende
Anyolite (Ruby: Al2O3, Zoisite: Ca2Al3(SiO4)3(OH))
metamorphic
Carnelian Agate
Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)
mineral
Pink Tumbled Agate (Dyed)
Silicon Dioxide (SiO2) with artificial dyes
mineral
Granodiorite (Riverbed Cobble)
Granodiorite
igneous
Jasper (likely river-tumbled)
Jasper (Silica/Silicon Dioxide, SiO2)
sedimentary (microcrystalline silicate)
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Organic (Biological specimen)
Obsidian
Obsidian (Amorphous volcanic glass, SiO2 with impurities)
igneous
Quartz (specifically Rose or Smoky tinted Quartz)
Silicon Dioxide (SiO2)
mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Unakite
Epidote-Feldspar rock (specifically, a variety of granite)
Metamorphic rock
Chert / Flint
Chert (SiO2)
sedimentary
Fluorite (likely)
Calcium Fluoride (CaF2)
Mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartzite with Quartz Veining
Quartzite (primarily SiO2)
metamorphic
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Emerald
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Titanium Aura Quartz
Titanium bonded Silicon Dioxide (SiO2 + Ti)
mineral
Mica Schist with Quartz
Mica-Quartz Schist (Muscovite subclass)
metamorphic
Caribbean Calcite
Calcite and Aragonite (CaCO3)
mineral
Sandstone (River Cobble)
Arenite
sedimentary
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Chalcedony (Agate/Quartz variety)
Cryptocrystalline Quartz (SiO2)
mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Quartzite with Iron Banding
Metamorphosed Quartz-rich Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Ruby in Zoisite
Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (composed of multiple minerals)
Chalcedony (Desert Rose or Botryoidal Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite (Weathered)
Phaneritic Felsic Igneous Rock
Igneous
Dragon Stone
Ohko Stone (Argillaceous sedimentary rock)
sedimentary
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Toast
Triticum aestivum (processed)
not a geological specimen