Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
Agatized Fossil or Chalcedony Nodule
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Biotite (Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Quartz (Milky/Yellowish variety)
Silicon Dioxide (SiO2)
mineral
Basalt (Crushed Stone Aggregate)
Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)
igneous
Crushed Limestone (Gravel)
Calcium Carbonate (CaCO3)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Amygdaloidal Basalt with Zeolite/Quartz Infill
Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)
igneous
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Limonite
Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O
mineral
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
Mineral-like byproduct (often mistaken for igneous rock or meteorite)
Limonite (vibrant yellowish-brown iron oxide)
Limonite (FeO(OH)·nH2O)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Anthracite Coal
Anthracite
sedimentary
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Mineral
Pink Banded Onyx (Mexican Onyx / Calcite)
Calcite (CaCO3) - microcrystalline calcium carbonate
sedimentary
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Painted Pet Rock (Quartzite/Sandstone base)
Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments
sedimentary
Chert (specifically Red Chert/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Agate (Nodule/Chert)
Silicon Dioxide (SiO2)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Diamond
Native Carbon (C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous
Pink Jade (Dyed Quartzite)
Silicon Dioxide (SiO2) - primarily Quartzite or Quartz
metamorphic
Diamond
Native Carbon (C)
mineral
Diamond
Native Carbon (C)
mineral
Ocean Jasper Mushroom
Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)
mineral
Breccia
Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)
sedimentary
Quartz (Milky or Cloudy Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary