Bauxite / Iron-rich Laterite
Laterite (principally Al(OH)3, Fe2O3, and SiO2)
sedimentary
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
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Fluorite Geode
Calcium Fluoride (CaF2)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Gneiss
Gneiss
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pegmatite (Granite Pegmatite)
Intrusive Igneous Rock (Granite Pegmatite)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Concretion
Siderite or Ironstone Concretion
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group
Mineral
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Greenstone (Greenschist)
Greenschist (composed of Chlorite, Epidote, and Actinolite)
metamorphic
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Likely polished garnet fragment
Garnet group, possibly almandine (Fe₃Al₂Si₃O₁₂)
gemstone
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Schist
Mica Schist
metamorphic
Gossan with Copper Carbonate (Chrysocolla/Malachite)
Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
Mineral/Sedimentary Interface
Mixed pebble collection, including likely flint, quartzite, and fossil material
Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil
sedimentary
Schist
Mica Schist
metamorphic
Gneiss (specifically a water-worn pebble)
Gneiss
metamorphic
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Shale fragment
Shale (Laminated Mudstone)
sedimentary
Granite Gneiss
Gneiss (Derived from Granite protolith)
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Gneiss
Gneiss
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Greenstone
Greenschist (primarily composed of chlorite, actinolite, and epidote)
metamorphic
Red Sandstone
Sandstone (Iron Oxide Rich)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Chert Conglomerate (or Breccia)
Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)
sedimentary