Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
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Red Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Quartz-veined Basalt or Diabase Pebble
Igneous rock with hydrothermal quartz vein
igneous
Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Shale
Shale (claystone/mudstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
sedimentary
Gneiss (with Quartz Vein / Pegmatite Banding)
Metamorphic Gneiss
metamorphic
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Fossilized Shark Tooth (Partial)
Elasmobranchii (fossil tooth fragment)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Red Jasper
Quartz (SiO2) with iron oxide inclusions
sedimentary
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Fossilized Crinoid Stem Segment
Crinoid (Phylum Echinodermata, Class Crinoidea)
sedimentary
Dinosaur Skull Fossil (Velociraptor Replica)
Velociraptor mongoliensis fossil specimen in sedimentary matrix
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Conglomerate (Greenstone/Pebble Conglomerate)
Polymictic Conglomerate
sedimentary
Granite
Intrusive Igneous Rock
igneous
Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Bamboo Leaf Jasper
Silicified Siltstone or Jasper (SiO2)
sedimentary
Graphic Granite (or Rapakivi-textured Granite)
Alkali feldspar granite
igneous
Quartz (Druzy / Crystalline)
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous