Granite (specifically Rapakivi Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Obsidian
Volcanic Glass (Extrusive Igneous Rock, primarily SiO2)
igneous
Chert Pebble with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (White/Gray variety)
Chert (SiO2)
sedimentary
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite (Plagioclase Feldspar + Amphibole/Biotite)
igneous
Porphyritic Basalt (Peanut Obsidian/Star Galaxy-style)
Porphyritic Basalt (Silica-rich Volcanic Rock)
igneous
Pink Granite
Phaneritic intrusive igneous rock with dominant Alkali Feldspar
igneous
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Diorite
Phaneritic Intermediate Plutonic Rock (Diorite)
igneous
Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
sedimentary
Granite River Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni)₃Si₂O―(OH)₄
metamorphic
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Conglomerate (Red Sandstone variety)
Clastic Sedimentary Rock (Conglomeratic Sandstone)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt
igneous
Nuummite
Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)
metamorphic
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Anthracite Coal
Anthracite (Carbon C)
metamorphic
Ventifact
Eolian Ventifact (often composed of basalt, chert, or quartzite)
sedimentary
Chalcedony (Botryoidal or Agate nodule)
Silicon Dioxide (SiO2)
mineral
Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)
Sedimentary
Ferruginous Breccia
Breccia with Iron-rich (Hematite/Goethite) Matrix
sedimentary
Ferruginous Sandstone (Gozzan)
Iron-rich clastic sedimentary rock with Limonite/Goethite
sedimentary
Slate
Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Diorite
Diorite
igneous
Fossilized Gastropod in Limestone
Gastropoda (Class) in Fossiliferous Limestone
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous