Heart-shaped Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Quartz / Calcite Pebble
SiO2 (Quartz) or CaCO3 (Calcite)
mineral
Pink Dyed Agate
Silicon Dioxide (SiO2) - Variety Agate
mineral
Yellow Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
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)
Blue Lace Agate (Polished Point)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Unakite
Altered granite (Epidote, Orthoclase Feldspar, and Quartz)
metamorphic
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Gold Nugget Jewelry
Native Gold (Au)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Limestone Pebble
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Banded Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Green Chalcedony (Batu Akik)
Silicon Dioxide (SiO2)
gemstone
Chrysocolla (in Host Rock)
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Granite
Plutonic felsic igneous rock
igneous
Pumice
Pumice
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Granite
Granite (a common igneous rock)
igneous
Shale
Shale (clay-sized silicate minerals)
sedimentary
Jasper
SiO2
Mineral
Travertine (Tufa)
Chemical Sedimentary Limestone (CaCO3)
sedimentary
Moonstone
Orthoclase Feldspar (KAlSi3O8)
Mineral
Shale with Trace Fossils
Fissile mudrock (Shale)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Fuchsite
Fuchsite (a variety of Muscovite mica, K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Conglomerate
Conglomerate
sedimentary