Porphyritic Basalt (Peanut Obsidian/Star Galaxy-style)
Porphyritic Basalt (Silica-rich Volcanic Rock)
igneous
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Basalt (Volcanic Mafic Rock)
igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Nuummite
Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite)
metamorphic
Chert (Pink Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Scoria
Vesicular Basalt / Scoriaceous Basalt
igneous
Jasper with Cinnabar (Dragon Blood Jasper variant)
Silicon Dioxide with Mercury Sulfide (SiO2 + HgS)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite (River Pebble)
Metamorphic Quartz (SiO2)
metamorphic
Limestone (specifically Chalky Limestone)
Calcium Carbonate (CaCO3 / Calcite)
sedimentary
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Lapis Lazuli
Lapis Lazuli (Aggregate primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,SO4,Cl,1-2) with Calcite and Pyrite)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Common Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Scoria (Lava Rock)
Scoria (Extrusive Igneous Rock / Mafic Silicates)
igneous
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
igneous
Rhyolite
Rhyolite
igneous
Rhyolitic Tuff (Breccia Type)
Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Chert (and Jasper pebble)
Microcrystalline Silica (SiO2)
sedimentary
Mica Group Minerals
There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Chert / Flint (with quartz or calcite inclusion)
Silicon dioxide (SiO2)
sedimentary
Basalt
Basalt
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Chert (Cherty Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Chert (Flinty variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Crushed Granite Gravel
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Serpentinite
Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary