Obsidian
Volcanic glass (high silica volcanic rock)
igneous
Category
Mineral Like (Anthropogenic)
Browse mineral like (anthropogenic) specimens identified by the Rock Identifier community.
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Basalt with Epidote/Quartz Vein
Mafic Volcanic Rock with Hydrothermal Veining
igneous
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Kyanite (within Quartz)
Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Shale
Lutaceous Rock (Hydrous Aluminum Silicates)
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Snowflake Obsidian
Volcanic glass containing Spherulitic inclusions (SiO2 + impurities)
igneous
Azurite
Azurite (Cu3(CO3)2(OH)2)
mineral
Beryllonite
Beryllonite (NaBePO4)
mineral
Shale with Iron Staining
Fissile Argillaceous Sedimentary Rock
sedimentary
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)
sedimentary
Rose Quartz
Silicon dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Black Tourmaline (Schorl)
NaFe2+3Al6(BO3)3Si6O18(OH)4
mineral
Agate Geode
Silicon Dioxide (SiO2) - Banded Chalcedony with Quartz
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides
mineral
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Muscovite Mica (with Quartz matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Feldspar (likely Orthoclase or Plagioclase)
Tectosilicate Feldspar (KAlSi3O8 to (Ca,Na)(Al,Si)4O8)
mineral
Basalt with Epidote/Chlorite
Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))
igneous
Glauconitic Sandstone
Glauconitic Quartz Arenite (with K,Mg,Fe,Al silicate hydroxide)
sedimentary
Garden Quartz (Phantom Quartz)
Silicon Dioxide (SiO2) with various inclusions (often Chlorite, Hematite, or Iron)
mineral
Gold-bearing Quartz and Pyrite
Auriferous Quartz (SiO2 + Au) with Pyrite (FeS2)
mineral
Quartz (Milky/Gray variety)
Silicon Dioxide (SiO2)
mineral
Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating
mineral
Mantle Xenolith in Basalt
Peridotite Xenolith in Basalt
igneous
Septarian Nodule (Pebble)
Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Gneiss
Gneiss
metamorphic
Porphyritic Basalt (Leopard Palm Stone)
Porphyritic Mafic Volcanic Rock
igneous